diff --git a/CHANGELOG.md b/CHANGELOG.md
index 03c7c58ce..83009dc33 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -44,6 +44,7 @@ Other guiding principles:
 - **amaru-ledger**: validate the governance actions a transaction votes on actually exist, counting proposals submitted earlier in the same block. ([#1139][], [#924][])
 - **amaru-ledger**: reject votes cast on governance actions that have expired. A proposal's expiry is now stamped once, when it is submitted, and carried through the volatile state, which will resolve some potential bugs. ([#1143][], [#926][])
 - **amaru-ledger**: from protocol version 11 on, reject votes cast by constitutional committee members the *elected* committee does not name, even when they hold an authorized hot credential. ([#1157][], [#922][])
+- **amaru-ledger**: reject votes cast on a kind of governance action the voter has no say over. ([#927][])
 
 ## [v10.11.20260806](https://github.com/pragma-org/amaru/releases/tag/v10.11.20260807)
 
@@ -277,6 +278,7 @@ Other guiding principles:
 [#923]: https://github.com/pragma-org/amaru/issues/923
 [#924]: https://github.com/pragma-org/amaru/issues/924
 [#926]: https://github.com/pragma-org/amaru/issues/926
+[#927]: https://github.com/pragma-org/amaru/issues/927
 [#928]: https://github.com/pragma-org/amaru/issues/928
 [#929]: https://github.com/pragma-org/amaru/issues/929
 [#942]: https://github.com/pragma-org/amaru/pull/942
diff --git a/crates/amaru-kernel/src/cardano/protocol_parameters_update.rs b/crates/amaru-kernel/src/cardano/protocol_parameters_update.rs
index c96d180b6..413c788ba 100644
--- a/crates/amaru-kernel/src/cardano/protocol_parameters_update.rs
+++ b/crates/amaru-kernel/src/cardano/protocol_parameters_update.rs
@@ -18,7 +18,7 @@ use crate::{
     CostModels, DRepVotingThresholds, ExUnitPrices, ExUnits, Lovelace, PoolVotingThresholds, RationalNumber, cbor,
 };
 
-#[derive(Debug, Clone, PartialEq, Eq, serde::Serialize, serde::Deserialize, cbor::Encode, cbor::Decode)]
+#[derive(Debug, Clone, Default, PartialEq, Eq, serde::Serialize, serde::Deserialize, cbor::Encode, cbor::Decode)]
 #[cbor(map)]
 pub struct ProtocolParamUpdate {
     #[n(0)]
@@ -83,6 +83,22 @@ pub struct ProtocolParamUpdate {
     pub minfee_refscript_cost_per_byte: Option<RationalNumber>,
 }
 
+impl ProtocolParamUpdate {
+    /// Whether the update touches any parameter of the 'security group'.
+    pub fn modifies_security_group(&self) -> bool {
+        self.minfee_a.is_some()
+            || self.minfee_b.is_some()
+            || self.max_block_body_size.is_some()
+            || self.max_block_header_size.is_some()
+            || self.max_transaction_size.is_some()
+            || self.ada_per_utxo_byte.is_some()
+            || self.max_block_ex_units.is_some()
+            || self.max_value_size.is_some()
+            || self.governance_action_deposit.is_some()
+            || self.minfee_refscript_cost_per_byte.is_some()
+    }
+}
+
 pub fn display_protocol_parameters_update(update: &ProtocolParamUpdate, prefix: &str) -> Result<String, fmt::Error> {
     let mut s = String::new();
 
@@ -229,3 +245,42 @@ pub fn display_protocol_parameters_update(update: &ProtocolParamUpdate, prefix:
 
     Ok(s)
 }
+
+#[cfg(test)]
+mod tests {
+    use test_case::test_case;
+
+    use super::*;
+
+    fn one() -> RationalNumber {
+        RationalNumber { numerator: 1, denominator: 1 }
+    }
+
+    #[test_case(|update| update.minfee_a = Some(1); "minfee_a")]
+    #[test_case(|update| update.minfee_b = Some(1); "minfee_b")]
+    #[test_case(|update| update.max_block_body_size = Some(1); "max_block_body_size")]
+    #[test_case(|update| update.max_block_header_size = Some(1); "max_block_header_size")]
+    #[test_case(|update| update.max_transaction_size = Some(1); "max_transaction_size")]
+    #[test_case(|update| update.ada_per_utxo_byte = Some(1); "ada_per_utxo_byte")]
+    #[test_case(|update| update.max_block_ex_units = Some(ExUnits { mem: 1, steps: 1 }); "max_block_ex_units")]
+    #[test_case(|update| update.max_value_size = Some(1); "max_value_size")]
+    #[test_case(|update| update.governance_action_deposit = Some(1); "governance_action_deposit")]
+    #[test_case(|update| update.minfee_refscript_cost_per_byte = Some(one()); "minfee_refscript_cost_per_byte")]
+    fn in_security_group(modify: fn(&mut ProtocolParamUpdate)) {
+        let mut update = ProtocolParamUpdate::default();
+        modify(&mut update);
+        assert!(update.modifies_security_group());
+    }
+
+    #[test_case(|_| (); "nothing modified at all")]
+    #[test_case(|update| update.key_deposit = Some(1); "key_deposit")]
+    #[test_case(|update| update.max_tx_ex_units = Some(ExUnits { mem: 1, steps: 1 }); "max_tx_ex_units")]
+    #[test_case(|update| update.execution_costs = Some(ExUnitPrices { mem_price: one(), step_price: one() }); "execution_costs")]
+    #[test_case(|update| update.cost_models_for_script_languages = Some(CostModels { plutus_v1: None, plutus_v2: None, plutus_v3: None }); "cost_models")]
+    #[test_case(|update| update.drep_deposit = Some(1); "drep_deposit")]
+    fn out_of_security_group(modify: fn(&mut ProtocolParamUpdate)) {
+        let mut update = ProtocolParamUpdate::default();
+        modify(&mut update);
+        assert!(!update.modifies_security_group());
+    }
+}
diff --git a/crates/amaru-ledger/src/governance/ratification/stake_pools.rs b/crates/amaru-ledger/src/governance/ratification/stake_pools.rs
index 02f3437a0..80f896798 100644
--- a/crates/amaru-ledger/src/governance/ratification/stake_pools.rs
+++ b/crates/amaru-ledger/src/governance/ratification/stake_pools.rs
@@ -14,7 +14,7 @@
 
 use std::collections::BTreeMap;
 
-use amaru_kernel::{DRep, PoolId, PoolVotingThresholds, ProtocolParamUpdate, Vote};
+use amaru_kernel::{DRep, PoolId, PoolVotingThresholds, Vote};
 use num::Zero;
 
 use super::{CommitteeUpdate, OrphanProposal, ProposalEnum};
@@ -37,7 +37,7 @@ pub fn voting_threshold(
 ) -> Option<SafeRatio> {
     match proposal {
         ProposalEnum::ProtocolParameters(params_update, _) => {
-            if any_update_in_security_group(params_update) {
+            if params_update.modifies_security_group() {
                 Some(into_safe_ratio(&voting_thresholds.security_voting_threshold))
             } else {
                 Some(SafeRatio::zero())
@@ -66,22 +66,6 @@ pub fn voting_threshold(
     }
 }
 
-// Check whether the update contains any parameter that is considered part of the 'security group'.
-// Those parameters require approval from the SPO to be changed. Others are only in the hands of
-// DReps & Constitutional Committee.
-fn any_update_in_security_group(update: &ProtocolParamUpdate) -> bool {
-    update.minfee_a.is_some()
-        || update.minfee_b.is_some()
-        || update.max_block_body_size.is_some()
-        || update.max_block_header_size.is_some()
-        || update.max_transaction_size.is_some()
-        || update.ada_per_utxo_byte.is_some()
-        || update.max_block_ex_units.is_some()
-        || update.max_value_size.is_some()
-        || update.governance_action_deposit.is_some()
-        || update.minfee_refscript_cost_per_byte.is_some()
-}
-
 // Tally
 // ----------------------------------------------------------------------------
 
diff --git a/crates/amaru-ledger/src/rules/transaction/phase_one/fixture.rs b/crates/amaru-ledger/src/rules/transaction/phase_one/fixture.rs
index 22527da55..d32e16632 100644
--- a/crates/amaru-ledger/src/rules/transaction/phase_one/fixture.rs
+++ b/crates/amaru-ledger/src/rules/transaction/phase_one/fixture.rs
@@ -205,11 +205,10 @@ struct ProposalProxy {
     #[serde(deserialize_with = "deserialize_cbor_hex")]
     id: ProposalId,
     valid_until: Epoch,
+    #[serde(deserialize_with = "deserialize_cbor_hex")]
+    gov_action: GovernanceAction,
 }
 
-/// The identity and expiry of a seeded proposal are the only parts a fixture states; the rest of
-/// [`ProposalState`] is stood up as an `Information` action, the one governance action that
-/// constrains nothing about who may vote on it.
 fn deserialize_proposals<'de, D>(deserializer: D) -> Result<BTreeMap<ProposalId, ProposalState>, D::Error>
 where
     D: serde::Deserializer<'de>,
@@ -227,7 +226,7 @@ where
                 proposal: Proposal {
                     deposit: 0,
                     reward_account: RewardAccount::from(vec![]),
-                    gov_action: GovernanceAction::Information,
+                    gov_action: entry.gov_action,
                     anchor: Anchor { content_hash: Hash::new([0; 32]), url: String::new() },
                 },
             };
@@ -266,6 +265,7 @@ pub(super) enum Predicate {
     ConflictingMetadataHash,
     ConwayTxRefScriptsSizeTooBig,
     ConwayWdrlNotDelegatedToDRep,
+    DisallowedVoters,
     FeeTooSmallUTxO,
     GovActionsDoNotExist,
     IncorrectDepositDELEG,
@@ -378,6 +378,9 @@ impl From<PhaseOneError> for Predicate {
             PhaseOneError::VotingProcedures(InvalidVotingProcedures::VotingOnExpiredGovAction(_, _)) => {
                 Predicate::VotingOnExpiredGovAction
             }
+            PhaseOneError::VotingProcedures(InvalidVotingProcedures::DisallowedVoter(_, _)) => {
+                Predicate::DisallowedVoters
+            }
             PhaseOneError::ValueNotPreserved(_) => Predicate::ValueNotConservedUTxO,
             PhaseOneError::Certificates(InvalidCertificates::StakeCredentialInvalidPoolDelegation(ref e)) => match e {
                 DelegateError::UnknownSource(_) => Predicate::StakeCredentialInvalidPoolDelegation,
diff --git a/crates/amaru-ledger/src/rules/transaction/phase_one/voting_procedures.rs b/crates/amaru-ledger/src/rules/transaction/phase_one/voting_procedures.rs
index 302793f90..857780a9b 100644
--- a/crates/amaru-ledger/src/rules/transaction/phase_one/voting_procedures.rs
+++ b/crates/amaru-ledger/src/rules/transaction/phase_one/voting_procedures.rs
@@ -15,8 +15,8 @@
 use std::collections::{BTreeMap, BTreeSet};
 
 use amaru_kernel::{
-    EraHistory, HasOwnership, MemoizedDatum, NonEmptyKeyValuePairs, ProposalId, ProtocolVersion, RedeemerTag,
-    RequiredScript, StakeCredential, TransactionPointer, Voter, VotingProcedure,
+    EraHistory, GovernanceAction, HasOwnership, MemoizedDatum, NonEmptyKeyValuePairs, ProposalId, ProtocolVersion,
+    RedeemerTag, RequiredScript, StakeCredential, TransactionPointer, Voter, VotingProcedure,
 };
 use thiserror::Error;
 
@@ -36,6 +36,9 @@ pub enum InvalidVotingProcedures {
     #[error("votes cast on governance actions that have expired: Voter {0:?} on proposal {1:?}")]
     VotingOnExpiredGovAction(Voter, ProposalId),
 
+    #[error("vote cast on a governance action the voter has no say over: Voter {0:?} on proposal {1:?}")]
+    DisallowedVoter(Voter, ProposalId),
+
     #[error("era history error: {0}")]
     EraHistory(#[from] amaru_kernel::EraHistoryError),
 }
@@ -79,6 +82,10 @@ where
                         return Err(InvalidVotingProcedures::VotingOnExpiredGovAction(voter.clone(), *proposal_id));
                     }
 
+                    Some(state) if !is_entitled_to_vote(voter, &state.proposal.gov_action) => {
+                        return Err(InvalidVotingProcedures::DisallowedVoter(voter.clone(), *proposal_id));
+                    }
+
                     Some(..) => {}
                 }
             }
@@ -114,7 +121,7 @@ where
     Ok(())
 }
 
-/// Election statushere is membership, not an unexpired term: a member whose term has run out is still
+/// Election status here is membership, not an unexpired term: a member whose term has run out is still
 /// named by the committee, and their vote is discounted when the action is ratified instead.
 ///
 /// Voters that are not committee members are never rejected by this check.
@@ -132,6 +139,28 @@ where
     }
 }
 
+/// Whether a voter has any say over this kind of governance action
+fn is_entitled_to_vote(voter: &Voter, action: &GovernanceAction) -> bool {
+    match voter {
+        Voter::ConstitutionalCommitteeKey(..) | Voter::ConstitutionalCommitteeScript(..) => {
+            !matches!(action, GovernanceAction::NoConfidence(..) | GovernanceAction::UpdateCommittee(..))
+        }
+
+        Voter::StakePoolKey(..) => match action {
+            GovernanceAction::ParameterChange(_, update, _) => update.modifies_security_group(),
+
+            GovernanceAction::NewConstitution(..) | GovernanceAction::TreasuryWithdrawals(..) => false,
+
+            GovernanceAction::NoConfidence(..)
+            | GovernanceAction::UpdateCommittee(..)
+            | GovernanceAction::HardForkInitiation(..)
+            | GovernanceAction::Information => true,
+        },
+
+        Voter::DRepKey(..) | Voter::DRepScript(..) => true,
+    }
+}
+
 /// Whether the entity a vote is cast by is known at this point in the block.
 fn exists<C>(context: &C, voter: &Voter) -> bool
 where
diff --git a/crates/amaru-ledger/tests/data/phase-one/README.md b/crates/amaru-ledger/tests/data/phase-one/README.md
index 54f5c1542..57e7983dc 100644
--- a/crates/amaru-ledger/tests/data/phase-one/README.md
+++ b/crates/amaru-ledger/tests/data/phase-one/README.md
@@ -64,12 +64,10 @@ it is made up of seven fields:
   one or has resigned; `validUntil` is absent for a member holding no term, which is
   still a state a member can authorize a hot credential from. Note that a vote
   identifies its committee member by *hot* credential.
-- `proposals`: `[{ id, validUntil }]`, the governance actions that are already on the
-  chain and can therefore be voted on or referenced as an ancestor. `id` is hex-encoded
-  CBOR of a `GovActionId` and `validUntil` is the last epoch in which a vote on the
-  action still counts. The action itself is not stated: the harness stands it up as an
-  `Information` action, which constrains nothing about who may vote on it. A rule that
-  needs the action's type or its proposing pointer has to extend this schema.
+- `proposals`: `[{ id, validUntil, govAction }]`, the governance actions that are already
+  on the chain and can therefore be voted on or referenced as an ancestor. `id` is
+  hex-encoded CBOR of a `GovActionId`, `validUntil` is the last epoch in which a vote on
+  the action still counts, and `govAction` is hex-encoded CBOR of the `GovAction` itself.
 
 `protocolParameters` is loosely inspired by [Ogmios](https://github.com/CardanoSolutions/ogmios)
 but intentionally diverges:
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/0.json b/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/0.json
new file mode 100644
index 000000000..7978f5034
--- /dev/null
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/0.json
@@ -0,0 +1,51 @@
+{
+  "title": "vote cast by a committee member on a motion of no confidence",
+  "description": "The constitutional committee has no say over the action that dissolves it.",
+  "network": "preprod",
+  "eraHistory": {
+    "$ref": "common/eraHistory/preprod-conway.json"
+  },
+  "protocolParameters": {
+    "$ref": "common/protocolParameters/preprod-conway-v10.json"
+  },
+  "initialState": {
+    "utxo": [
+      {
+        "input": "825820b2d63157407a6741a64c9dbb84b29a02a931f2e8d469a7b9bd5f2bf78e06658d00",
+        "output": "a200581d6093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8011a004c4b40"
+      }
+    ],
+    "pools": [],
+    "accounts": [],
+    "dreps": [],
+    "committee": [
+      {
+        "coldCredential": "8200581cecc3093b061a9ed426cd9956161fc48d4ed1ac58dc4aaed7e1ce1830",
+        "hotCredential": "8200581c93c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8",
+        "validUntil": 200
+      }
+    ],
+    "proposals": [
+      {
+        "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
+        "validUntil": 100,
+        "govAction": "8203f6"
+      }
+    ],
+    "governanceActivity": {
+      "consecutiveDormantEpochs": 0
+    },
+    "pots": {
+      "treasury": 0,
+      "reserves": 0
+    }
+  },
+  "point": {
+    "slot": 0,
+    "transactionIndex": 0
+  },
+  "transaction": "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",
+  "expected": {
+    "predicate": "DisallowedVoters"
+  }
+}
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/1.json b/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/1.json
new file mode 100644
index 000000000..7c15f5de6
--- /dev/null
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/1.json
@@ -0,0 +1,51 @@
+{
+  "title": "vote cast by a committee member on a committee update",
+  "description": "The constitutional committee has no say over the action that reshapes its own membership.",
+  "network": "preprod",
+  "eraHistory": {
+    "$ref": "common/eraHistory/preprod-conway.json"
+  },
+  "protocolParameters": {
+    "$ref": "common/protocolParameters/preprod-conway-v10.json"
+  },
+  "initialState": {
+    "utxo": [
+      {
+        "input": "82582052b8dca44ab180eda06355c059f22641b6410935f97852fa70cdd0d3d689f32b00",
+        "output": "a200581d6093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8011a004c4b40"
+      }
+    ],
+    "pools": [],
+    "accounts": [],
+    "dreps": [],
+    "committee": [
+      {
+        "coldCredential": "8200581cecc3093b061a9ed426cd9956161fc48d4ed1ac58dc4aaed7e1ce1830",
+        "hotCredential": "8200581c93c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8",
+        "validUntil": 200
+      }
+    ],
+    "proposals": [
+      {
+        "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
+        "validUntil": 100,
+        "govAction": "8504f6d9010280a0d81e820102"
+      }
+    ],
+    "governanceActivity": {
+      "consecutiveDormantEpochs": 0
+    },
+    "pots": {
+      "treasury": 0,
+      "reserves": 0
+    }
+  },
+  "point": {
+    "slot": 0,
+    "transactionIndex": 0
+  },
+  "transaction": "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",
+  "expected": {
+    "predicate": "DisallowedVoters"
+  }
+}
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/2.json b/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/2.json
new file mode 100644
index 000000000..f2f021fcf
--- /dev/null
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/2.json
@@ -0,0 +1,47 @@
+{
+  "title": "vote cast by a stake pool on a new constitution",
+  "description": "Stake pools have no say over the constitution.",
+  "network": "preprod",
+  "eraHistory": {
+    "$ref": "common/eraHistory/preprod-conway.json"
+  },
+  "protocolParameters": {
+    "$ref": "common/protocolParameters/preprod-conway-v10.json"
+  },
+  "initialState": {
+    "utxo": [
+      {
+        "input": "82582069cc89b96119c6a7a191c65c8b4cf7d17531e3114b4181fd7e20c2f1c9ce254500",
+        "output": "a200581d6093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8011a004c4b40"
+      }
+    ],
+    "pools": [
+      "93c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8"
+    ],
+    "accounts": [],
+    "dreps": [],
+    "committee": [],
+    "proposals": [
+      {
+        "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
+        "validUntil": 100,
+        "govAction": "8305f68282781f68747470733a2f2f616d6172752e746573742f666978747572652e6a736f6e58200000000000000000000000000000000000000000000000000000000000000000f6"
+      }
+    ],
+    "governanceActivity": {
+      "consecutiveDormantEpochs": 0
+    },
+    "pots": {
+      "treasury": 0,
+      "reserves": 0
+    }
+  },
+  "point": {
+    "slot": 0,
+    "transactionIndex": 0
+  },
+  "transaction": "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",
+  "expected": {
+    "predicate": "DisallowedVoters"
+  }
+}
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/3.json b/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/3.json
new file mode 100644
index 000000000..395bd5f40
--- /dev/null
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/3.json
@@ -0,0 +1,47 @@
+{
+  "title": "vote cast by a stake pool on a treasury withdrawal",
+  "description": "Stake pools have no say over the treasury.",
+  "network": "preprod",
+  "eraHistory": {
+    "$ref": "common/eraHistory/preprod-conway.json"
+  },
+  "protocolParameters": {
+    "$ref": "common/protocolParameters/preprod-conway-v10.json"
+  },
+  "initialState": {
+    "utxo": [
+      {
+        "input": "8258203f22e2c1a5f357e51f16fd0ada42da2168a2e202a0d0ddff4d93827404422ca000",
+        "output": "a200581d6093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8011a004c4b40"
+      }
+    ],
+    "pools": [
+      "93c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8"
+    ],
+    "accounts": [],
+    "dreps": [],
+    "committee": [],
+    "proposals": [
+      {
+        "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
+        "validUntil": 100,
+        "govAction": "8302a1581de093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd81a000f4240f6"
+      }
+    ],
+    "governanceActivity": {
+      "consecutiveDormantEpochs": 0
+    },
+    "pots": {
+      "treasury": 0,
+      "reserves": 0
+    }
+  },
+  "point": {
+    "slot": 0,
+    "transactionIndex": 0
+  },
+  "transaction": "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",
+  "expected": {
+    "predicate": "DisallowedVoters"
+  }
+}
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/4.json b/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/4.json
new file mode 100644
index 000000000..12f62c7fb
--- /dev/null
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/DisallowedVoters/4.json
@@ -0,0 +1,47 @@
+{
+  "title": "vote cast by a stake pool on a parameter change outside the security group",
+  "description": "A change to the DRep deposit alone, which leaves every security group parameter untouched.",
+  "network": "preprod",
+  "eraHistory": {
+    "$ref": "common/eraHistory/preprod-conway.json"
+  },
+  "protocolParameters": {
+    "$ref": "common/protocolParameters/preprod-conway-v10.json"
+  },
+  "initialState": {
+    "utxo": [
+      {
+        "input": "825820cd1f97def587d794ae25535c9d1389e03898f9d3ed67b9aca10c0936c4a76cd200",
+        "output": "a200581d6093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8011a004c4b40"
+      }
+    ],
+    "pools": [
+      "93c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8"
+    ],
+    "accounts": [],
+    "dreps": [],
+    "committee": [],
+    "proposals": [
+      {
+        "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
+        "validUntil": 100,
+        "govAction": "8400f6a1181f1a1dcd6500f6"
+      }
+    ],
+    "governanceActivity": {
+      "consecutiveDormantEpochs": 0
+    },
+    "pots": {
+      "treasury": 0,
+      "reserves": 0
+    }
+  },
+  "point": {
+    "slot": 0,
+    "transactionIndex": 0
+  },
+  "transaction": "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",
+  "expected": {
+    "predicate": "DisallowedVoters"
+  }
+}
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/0.json b/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/0.json
index ce7d914c2..b23880c24 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/0.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/0.json
@@ -35,7 +35,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/1.json b/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/1.json
index 92f59eb5e..18b7e294c 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/1.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/1.json
@@ -22,7 +22,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/2.json b/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/2.json
index 0233ff879..942ddf691 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/2.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/2.json
@@ -28,7 +28,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/3.json b/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/3.json
index f11480094..e7b380deb 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/3.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/GovActionsDoNotExist/3.json
@@ -35,7 +35,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/0.json b/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/0.json
index daab77f27..c8b0e5069 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/0.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/0.json
@@ -34,7 +34,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/1.json b/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/1.json
index d3c02d9ec..e22c40c42 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/1.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/1.json
@@ -34,7 +34,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/2.json b/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/2.json
index 6a26e627f..3c1d8dca1 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/2.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/2.json
@@ -39,7 +39,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/3.json b/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/3.json
index 7af23da12..68771adbf 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/3.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/UnelectedCommitteeVoters/3.json
@@ -28,7 +28,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/0.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/0.json
index 142af5fa0..48b0a58ca 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/0.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/0.json
@@ -22,7 +22,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/1.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/1.json
index a8cca531c..971fa75aa 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/1.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/1.json
@@ -22,7 +22,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/2.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/2.json
index a78baa3b5..bf980e5f9 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/2.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/2.json
@@ -27,7 +27,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/3.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/3.json
index 4745d0e13..6c71c73e3 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/3.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/3.json
@@ -22,7 +22,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/4.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/4.json
index 57c8567b0..603501434 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/4.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/4.json
@@ -28,7 +28,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/5.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/5.json
index c63ad9595..c777ed3ba 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/5.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/5.json
@@ -28,7 +28,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/6.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/6.json
index b66fff04b..fbedc213f 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/6.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/6.json
@@ -28,7 +28,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/7.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/7.json
index f04e7ef98..b2bd2ec1f 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/7.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/7.json
@@ -28,7 +28,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/8.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/8.json
index 843c9d279..41ff2dd68 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/8.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotersDoNotExist/8.json
@@ -22,7 +22,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/0.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/0.json
index c7c47b4ea..54f84efb0 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/0.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/0.json
@@ -35,7 +35,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b01",
-        "validUntil": 0
+        "validUntil": 0,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/1.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/1.json
index 1a8a6f637..4701c536c 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/1.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/1.json
@@ -35,7 +35,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/10.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/10.json
index ed3b07505..e1edfc8c4 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/10.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/10.json
@@ -28,7 +28,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/11.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/11.json
index 328416124..701591d2e 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/11.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/11.json
@@ -28,7 +28,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/12.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/12.json
index f08102347..a6c2c0e81 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/12.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/12.json
@@ -22,7 +22,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/13.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/13.json
index cda215455..495d46c48 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/13.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/13.json
@@ -22,7 +22,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/14.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/14.json
index 8c94ded7a..defe5a6ec 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/14.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/14.json
@@ -22,7 +22,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/15.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/15.json
index 6147534ae..724490a95 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/15.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/15.json
@@ -35,11 +35,13 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/16.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/16.json
index 508262049..d14662f65 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/16.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/16.json
@@ -35,11 +35,13 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/2.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/2.json
index 35368760f..e1a1af60f 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/2.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/2.json
@@ -35,7 +35,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/3.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/3.json
index fe8885ec3..1c6abc98a 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/3.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/3.json
@@ -35,7 +35,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/4.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/4.json
index 748c2dd23..6d50a864b 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/4.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/4.json
@@ -35,7 +35,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/5.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/5.json
index aea4afb25..3d1a44b9d 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/5.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/5.json
@@ -35,7 +35,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/6.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/6.json
index abaf0dd6e..18641e99e 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/6.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/6.json
@@ -28,7 +28,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/7.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/7.json
index 570ea05e2..aa6c7171d 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/7.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/7.json
@@ -28,7 +28,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/8.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/8.json
index c25ae5280..8c8873bc7 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/8.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/8.json
@@ -28,7 +28,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/9.json b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/9.json
index 87406bd45..3bb33f1a6 100644
--- a/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/9.json
+++ b/crates/amaru-ledger/tests/data/phase-one/fail/VotingOnExpiredGovAction/9.json
@@ -28,7 +28,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-committee-hot-key.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-committee-hot-key.json
index a3ee5a6da..c1b49b21d 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-committee-hot-key.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-committee-hot-key.json
@@ -28,7 +28,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-committee-hot-script.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-committee-hot-script.json
index be925fb1b..a5ad4072e 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-committee-hot-script.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-committee-hot-script.json
@@ -28,7 +28,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-drep-key.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-drep-key.json
index ea7793ea6..963a4cde1 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-drep-key.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-drep-key.json
@@ -35,7 +35,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-drep-script.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-drep-script.json
index d41075465..d6e014067 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-drep-script.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-drep-script.json
@@ -35,7 +35,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-stake-pool.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-stake-pool.json
index da358b7fb..3ecc63bdd 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-stake-pool.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-action-expiring-this-epoch-stake-pool.json
@@ -24,7 +24,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-elected-member-protocol-version-11.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-elected-member-protocol-version-11.json
index 2df554876..6cb309c90 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-elected-member-protocol-version-11.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-elected-member-protocol-version-11.json
@@ -34,7 +34,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-hot-key-shared-with-unelected-member.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-hot-key-shared-with-unelected-member.json
index e629a6c61..c99778dac 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-hot-key-shared-with-unelected-member.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-hot-key-shared-with-unelected-member.json
@@ -39,7 +39,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-hot-key.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-hot-key.json
index bc92dc640..83978318e 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-hot-key.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-hot-key.json
@@ -28,7 +28,8 @@
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diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-hot-script.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-hot-script.json
index 89c9725a9..bf4b7661b 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-hot-script.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-hot-script.json
@@ -28,7 +28,8 @@
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     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-member-with-expired-term.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-member-with-expired-term.json
index 19c709b50..1b50fc7c1 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-member-with-expired-term.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-member-with-expired-term.json
@@ -34,7 +34,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 1
+        "validUntil": 1,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-new-constitution.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-new-constitution.json
new file mode 100644
index 000000000..a086e2ea3
--- /dev/null
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-new-constitution.json
@@ -0,0 +1,49 @@
+{
+  "title": "vote cast by a committee member on a new constitution",
+  "description": "The committee's say extends to the constitution it is charged with upholding.",
+  "network": "preprod",
+  "eraHistory": {
+    "$ref": "common/eraHistory/preprod-conway.json"
+  },
+  "protocolParameters": {
+    "$ref": "common/protocolParameters/preprod-conway-v10.json"
+  },
+  "initialState": {
+    "utxo": [
+      {
+        "input": "8258209bba1ec996e9f3e37fcc36f6d5ac872320660b109ddac964e664779980fc611300",
+        "output": "a200581d6093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8011a004c4b40"
+      }
+    ],
+    "pools": [],
+    "accounts": [],
+    "dreps": [],
+    "committee": [
+      {
+        "coldCredential": "8200581cecc3093b061a9ed426cd9956161fc48d4ed1ac58dc4aaed7e1ce1830",
+        "hotCredential": "8200581c93c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8",
+        "validUntil": 200
+      }
+    ],
+    "proposals": [
+      {
+        "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
+        "validUntil": 100,
+        "govAction": "8305f68282781f68747470733a2f2f616d6172752e746573742f666978747572652e6a736f6e58200000000000000000000000000000000000000000000000000000000000000000f6"
+      }
+    ],
+    "governanceActivity": {
+      "consecutiveDormantEpochs": 0
+    },
+    "pots": {
+      "treasury": 0,
+      "reserves": 0
+    }
+  },
+  "point": {
+    "slot": 0,
+    "transactionIndex": 0
+  },
+  "transaction": "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",
+  "expected": "Pass"
+}
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-treasury-withdrawals.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-treasury-withdrawals.json
new file mode 100644
index 000000000..0a1923906
--- /dev/null
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-treasury-withdrawals.json
@@ -0,0 +1,49 @@
+{
+  "title": "vote cast by a committee member on a treasury withdrawal",
+  "description": "The committee has a say over every action but the two aimed at itself.",
+  "network": "preprod",
+  "eraHistory": {
+    "$ref": "common/eraHistory/preprod-conway.json"
+  },
+  "protocolParameters": {
+    "$ref": "common/protocolParameters/preprod-conway-v10.json"
+  },
+  "initialState": {
+    "utxo": [
+      {
+        "input": "825820e0483612e52e41bc15ffa584e258708d4067331695749d8aa434cebc2fd3fb9c00",
+        "output": "a200581d6093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8011a004c4b40"
+      }
+    ],
+    "pools": [],
+    "accounts": [],
+    "dreps": [],
+    "committee": [
+      {
+        "coldCredential": "8200581cecc3093b061a9ed426cd9956161fc48d4ed1ac58dc4aaed7e1ce1830",
+        "hotCredential": "8200581c93c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8",
+        "validUntil": 200
+      }
+    ],
+    "proposals": [
+      {
+        "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
+        "validUntil": 100,
+        "govAction": "8302a1581de093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd81a000f4240f6"
+      }
+    ],
+    "governanceActivity": {
+      "consecutiveDormantEpochs": 0
+    },
+    "pots": {
+      "treasury": 0,
+      "reserves": 0
+    }
+  },
+  "point": {
+    "slot": 0,
+    "transactionIndex": 0
+  },
+  "transaction": "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",
+  "expected": "Pass"
+}
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-unelected-member.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-unelected-member.json
index e4984df88..1a547a14a 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-unelected-member.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-committee-unelected-member.json
@@ -28,7 +28,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-expired-registration.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-expired-registration.json
index 256df6196..707e0d84e 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-expired-registration.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-expired-registration.json
@@ -35,7 +35,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-key-credential.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-key-credential.json
index cd037d34c..25aa2eb11 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-key-credential.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-key-credential.json
@@ -35,7 +35,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-no-confidence.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-no-confidence.json
new file mode 100644
index 000000000..6c584cffd
--- /dev/null
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-no-confidence.json
@@ -0,0 +1,56 @@
+{
+  "title": "vote cast by a drep on a motion of no confidence",
+  "description": "Dreps have a say over every kind of governance action, this one included.",
+  "network": "preprod",
+  "eraHistory": {
+    "$ref": "common/eraHistory/preprod-conway.json"
+  },
+  "protocolParameters": {
+    "$ref": "common/protocolParameters/preprod-conway-v10.json"
+  },
+  "initialState": {
+    "utxo": [
+      {
+        "input": "8258209e5279ec33a950772da723b03be556ae49ff7f7a444e4834ff92e0a665d3e53e00",
+        "output": "a200581d6093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8011a004c4b40"
+      }
+    ],
+    "pools": [],
+    "accounts": [],
+    "dreps": [
+      {
+        "credential": "8200581c93c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8",
+        "deposit": 500000000,
+        "registeredAt": {
+          "transaction": {
+            "slot": 0,
+            "transactionIndex": 0
+          },
+          "certificateIndex": 0
+        },
+        "validUntil": 1000
+      }
+    ],
+    "committee": [],
+    "proposals": [
+      {
+        "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
+        "validUntil": 100,
+        "govAction": "8203f6"
+      }
+    ],
+    "governanceActivity": {
+      "consecutiveDormantEpochs": 0
+    },
+    "pots": {
+      "treasury": 0,
+      "reserves": 0
+    }
+  },
+  "point": {
+    "slot": 0,
+    "transactionIndex": 0
+  },
+  "transaction": "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",
+  "expected": "Pass"
+}
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-protocol-version-11.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-protocol-version-11.json
index c6f3a90f3..5189b30ae 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-protocol-version-11.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-protocol-version-11.json
@@ -41,7 +41,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-treasury-withdrawals.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-treasury-withdrawals.json
new file mode 100644
index 000000000..6ce1a52a6
--- /dev/null
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-drep-treasury-withdrawals.json
@@ -0,0 +1,56 @@
+{
+  "title": "vote cast by a drep on a treasury withdrawal",
+  "description": "The action stake pools are barred from is one dreps carry a threshold on.",
+  "network": "preprod",
+  "eraHistory": {
+    "$ref": "common/eraHistory/preprod-conway.json"
+  },
+  "protocolParameters": {
+    "$ref": "common/protocolParameters/preprod-conway-v10.json"
+  },
+  "initialState": {
+    "utxo": [
+      {
+        "input": "8258209c37bdc1e4676c7fc9ff2e0adc4d24b793e13d878c28ac406d47757fdd42f07300",
+        "output": "a200581d6093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8011a004c4b40"
+      }
+    ],
+    "pools": [],
+    "accounts": [],
+    "dreps": [
+      {
+        "credential": "8200581c93c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8",
+        "deposit": 500000000,
+        "registeredAt": {
+          "transaction": {
+            "slot": 0,
+            "transactionIndex": 0
+          },
+          "certificateIndex": 0
+        },
+        "validUntil": 1000
+      }
+    ],
+    "committee": [],
+    "proposals": [
+      {
+        "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
+        "validUntil": 100,
+        "govAction": "8302a1581de093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd81a000f4240f6"
+      }
+    ],
+    "governanceActivity": {
+      "consecutiveDormantEpochs": 0
+    },
+    "pots": {
+      "treasury": 0,
+      "reserves": 0
+    }
+  },
+  "point": {
+    "slot": 0,
+    "transactionIndex": 0
+  },
+  "transaction": "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",
+  "expected": "Pass"
+}
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-script-credential.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-script-credential.json
index af2425c7e..259de99fd 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-script-credential.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-script-credential.json
@@ -35,7 +35,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool-hard-fork-initiation.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool-hard-fork-initiation.json
new file mode 100644
index 000000000..c405b8b36
--- /dev/null
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool-hard-fork-initiation.json
@@ -0,0 +1,45 @@
+{
+  "title": "vote cast by a stake pool on a hard fork initiation",
+  "description": "Stake pools carry a threshold on a hard fork, which cannot happen without the nodes running it.",
+  "network": "preprod",
+  "eraHistory": {
+    "$ref": "common/eraHistory/preprod-conway.json"
+  },
+  "protocolParameters": {
+    "$ref": "common/protocolParameters/preprod-conway-v10.json"
+  },
+  "initialState": {
+    "utxo": [
+      {
+        "input": "8258200d25d6f5993b3a0155897e8d97d54795f5945dac5a2076383e7e05e8232c452200",
+        "output": "a200581d6093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8011a004c4b40"
+      }
+    ],
+    "pools": [
+      "93c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8"
+    ],
+    "accounts": [],
+    "dreps": [],
+    "committee": [],
+    "proposals": [
+      {
+        "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
+        "validUntil": 100,
+        "govAction": "8301f6820b00"
+      }
+    ],
+    "governanceActivity": {
+      "consecutiveDormantEpochs": 0
+    },
+    "pots": {
+      "treasury": 0,
+      "reserves": 0
+    }
+  },
+  "point": {
+    "slot": 0,
+    "transactionIndex": 0
+  },
+  "transaction": "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",
+  "expected": "Pass"
+}
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool-no-confidence.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool-no-confidence.json
new file mode 100644
index 000000000..2ee400584
--- /dev/null
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool-no-confidence.json
@@ -0,0 +1,45 @@
+{
+  "title": "vote cast by a stake pool on a motion of no confidence",
+  "description": "Stake pools carry a threshold on the action that dissolves the committee.",
+  "network": "preprod",
+  "eraHistory": {
+    "$ref": "common/eraHistory/preprod-conway.json"
+  },
+  "protocolParameters": {
+    "$ref": "common/protocolParameters/preprod-conway-v10.json"
+  },
+  "initialState": {
+    "utxo": [
+      {
+        "input": "82582035d11e5dcaf28ddff61718afe2a1b07afc12b8d1bcd20f0f017930b88db1c34e00",
+        "output": "a200581d6093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8011a004c4b40"
+      }
+    ],
+    "pools": [
+      "93c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8"
+    ],
+    "accounts": [],
+    "dreps": [],
+    "committee": [],
+    "proposals": [
+      {
+        "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
+        "validUntil": 100,
+        "govAction": "8203f6"
+      }
+    ],
+    "governanceActivity": {
+      "consecutiveDormantEpochs": 0
+    },
+    "pots": {
+      "treasury": 0,
+      "reserves": 0
+    }
+  },
+  "point": {
+    "slot": 0,
+    "transactionIndex": 0
+  },
+  "transaction": "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",
+  "expected": "Pass"
+}
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool-parameter-change-security-group.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool-parameter-change-security-group.json
new file mode 100644
index 000000000..39ef4e9c6
--- /dev/null
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool-parameter-change-security-group.json
@@ -0,0 +1,45 @@
+{
+  "title": "vote cast by a stake pool on a parameter change within the security group",
+  "description": "A change to the minimum fee coefficient, which is a security group parameter.",
+  "network": "preprod",
+  "eraHistory": {
+    "$ref": "common/eraHistory/preprod-conway.json"
+  },
+  "protocolParameters": {
+    "$ref": "common/protocolParameters/preprod-conway-v10.json"
+  },
+  "initialState": {
+    "utxo": [
+      {
+        "input": "825820f264b1a1f0a418cf7400d3431b061992ae045b24e5b790fd74165c51bbd48d1000",
+        "output": "a200581d6093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8011a004c4b40"
+      }
+    ],
+    "pools": [
+      "93c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8"
+    ],
+    "accounts": [],
+    "dreps": [],
+    "committee": [],
+    "proposals": [
+      {
+        "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
+        "validUntil": 100,
+        "govAction": "8400f6a100182cf6"
+      }
+    ],
+    "governanceActivity": {
+      "consecutiveDormantEpochs": 0
+    },
+    "pots": {
+      "treasury": 0,
+      "reserves": 0
+    }
+  },
+  "point": {
+    "slot": 0,
+    "transactionIndex": 0
+  },
+  "transaction": "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",
+  "expected": "Pass"
+}
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool-update-committee.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool-update-committee.json
new file mode 100644
index 000000000..cb577f262
--- /dev/null
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool-update-committee.json
@@ -0,0 +1,45 @@
+{
+  "title": "vote cast by a stake pool on a committee update",
+  "description": "Stake pools carry a threshold on the action that reshapes the committee.",
+  "network": "preprod",
+  "eraHistory": {
+    "$ref": "common/eraHistory/preprod-conway.json"
+  },
+  "protocolParameters": {
+    "$ref": "common/protocolParameters/preprod-conway-v10.json"
+  },
+  "initialState": {
+    "utxo": [
+      {
+        "input": "825820467a6bb5b317f10d7ed9acd46560f56fe75a00efa98165fe890d0323e42b09cc00",
+        "output": "a200581d6093c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8011a004c4b40"
+      }
+    ],
+    "pools": [
+      "93c191b1094746961f6f00fba27f3d8eff6a66490baf806d4e179fd8"
+    ],
+    "accounts": [],
+    "dreps": [],
+    "committee": [],
+    "proposals": [
+      {
+        "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
+        "validUntil": 100,
+        "govAction": "8504f6d9010280a0d81e820102"
+      }
+    ],
+    "governanceActivity": {
+      "consecutiveDormantEpochs": 0
+    },
+    "pots": {
+      "treasury": 0,
+      "reserves": 0
+    }
+  },
+  "point": {
+    "slot": 0,
+    "transactionIndex": 0
+  },
+  "transaction": "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",
+  "expected": "Pass"
+}
diff --git a/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool.json b/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool.json
index 839414115..88612d2b1 100644
--- a/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool.json
+++ b/crates/amaru-ledger/tests/data/phase-one/pass/vote-stake-pool.json
@@ -24,7 +24,8 @@
     "proposals": [
       {
         "id": "8258207e2b9d5f1a3c7e5b9d1f3a5c7e9b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b00",
-        "validUntil": 100
+        "validUntil": 100,
+        "govAction": "8106"
       }
     ],
     "governanceActivity": {
diff --git a/crates/amaru-ledger/tests/data/phase-one/schema.json b/crates/amaru-ledger/tests/data/phase-one/schema.json
index b3a65fe75..e92dc3007 100644
--- a/crates/amaru-ledger/tests/data/phase-one/schema.json
+++ b/crates/amaru-ledger/tests/data/phase-one/schema.json
@@ -267,7 +267,7 @@
     },
     "Proposal": {
       "type": "object",
-      "required": ["id", "validUntil"],
+      "required": ["id", "validUntil", "govAction"],
       "properties": {
         "id": {
           "$ref": "#/$defs/HexCbor",
@@ -277,6 +277,10 @@
           "type": "integer",
           "minimum": 0,
           "description": "Last epoch in which a vote on the action still counts."
+        },
+        "govAction": {
+          "$ref": "#/$defs/HexCbor",
+          "description": "Hex-encoded CBOR of GovAction. Decides which voters may vote on the proposal at all, so it is required even when a case does not turn on it; use \"8106\" (Information) for the action no voter is barred from."
         }
       }
     },
diff --git a/crates/amaru-ledger/tests/data/rules-conformance.failures.toml b/crates/amaru-ledger/tests/data/rules-conformance.failures.toml
index 9b2352af3..ae3fbd16b 100644
--- a/crates/amaru-ledger/tests/data/rules-conformance.failures.toml
+++ b/crates/amaru-ledger/tests/data/rules-conformance.failures.toml
@@ -22,9 +22,6 @@
 "conway/fail-deleg-delegate-unregistered-stake-credentials/0" = "Expected failure, got success"
 "conway/fail-deleg-delegate-vote-of-unregistered-stake-credentials/0" = "Expected failure, got success"
 "conway/fail-deleg-with-non-zero-reward-balance/0" = "Expected failure, got success"
-"conway/fail-gov-committee-member-can-not-vote-on-noconfidence-action/0" = "Expected failure, got success"
-"conway/fail-gov-committee-member-can-not-vote-on-updatecommittee-action/0" = "Expected failure, got success"
-"conway/fail-gov-committee-member-mixed-with-other-voters-can-not-vote-on-updatecommittee-action/0" = "Expected failure, got success"
 "conway/fail-gov-empty-prevgovid-after-the-first-constitution-was-enacted/0" = "Expected failure, got success"
 "conway/fail-gov-expired-gov-actions/0" = "Expected failure, got success"
 "conway/fail-gov-invalid-index-in-govpurposeid/0" = "Expected failure, got success"