diff --git a/tools/runtime-codegen/Cargo.lock b/tools/runtime-codegen/Cargo.lock
index bcce1e5589..1dddbb4afb 100644
--- a/tools/runtime-codegen/Cargo.lock
+++ b/tools/runtime-codegen/Cargo.lock
@@ -1204,7 +1204,7 @@ dependencies = [
  "blake2",
  "file-guard",
  "fs-err",
- "prettyplease",
+ "prettyplease 0.2.37",
  "proc-macro2",
  "quote",
  "syn 2.0.118",
@@ -2634,6 +2634,16 @@ dependencies = [
  "syn 2.0.118",
 ]
 
+[[package]]
+name = "prettyplease"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2bfe0f4c752e450fc2faf62654f1c134747922825d5b04ca717b8874f41a40c0"
+dependencies = [
+ "proc-macro2",
+ "syn 3.0.1",
+]
+
 [[package]]
 name = "primitive-types"
 version = "0.13.1"
@@ -2879,10 +2889,11 @@ dependencies = [
  "color-eyre",
  "indoc",
  "parity-scale-codec",
- "prettyplease",
+ "prettyplease 0.3.0",
  "proc-macro2",
  "subxt-codegen",
  "subxt-utils-fetchmetadata",
+ "syn 3.0.1",
  "wasm-loader",
  "wasm-testbed",
 ]
diff --git a/tools/runtime-codegen/Cargo.toml b/tools/runtime-codegen/Cargo.toml
index 3ca509a14d..4a9e4f26c3 100644
--- a/tools/runtime-codegen/Cargo.toml
+++ b/tools/runtime-codegen/Cargo.toml
@@ -16,9 +16,11 @@ clap = { version = "4.5.3", features = ["derive", "cargo"] }
 codec = { package = "parity-scale-codec", version = "3.7.4", features = ["derive"] }
 color-eyre = "0.6.1"
 indoc = "2.0.5"
-prettyplease = "0.2.20"
+prettyplease = "0.3.0"
 proc-macro2 = "1.0.56"
 subxt-codegen = { version = "0.44.0" }
 subxt-utils-fetchmetadata = { version = "0.44.0", features = ["url"] }
+# Must stay on the same major as `prettyplease`'s `syn`, see `print_runtime`.
+syn = { version = "3.0.0", features = ["full", "parsing"] }
 wasm-loader = { git = "https://github.com/chevdor/subwasm", branch = "master" }
 wasm-testbed = { git = "https://github.com/chevdor/subwasm", branch = "master" }
diff --git a/tools/runtime-codegen/src/main.rs b/tools/runtime-codegen/src/main.rs
index 9e09e31857..496848f05f 100644
--- a/tools/runtime-codegen/src/main.rs
+++ b/tools/runtime-codegen/src/main.rs
@@ -78,7 +78,10 @@ impl TypeSubstitute {
 }
 
 fn print_runtime(runtime_api: proc_macro2::TokenStream) {
-	let syn_tree = syn::parse_file(&runtime_api.to_string()).unwrap();
+	// `prettyplease` builds on `syn` 3, while `subxt-codegen` still exposes `syn` 2 types. Both
+	// versions are in the tree, so parse with our own `syn` (`::syn`, the 3.x one) instead of the
+	// re-export used everywhere else in this file.
+	let syn_tree = ::syn::parse_file(&runtime_api.to_string()).unwrap();
 	let pretty_runtime_api = prettyplease::unparse(&syn_tree);
 
 	indoc::printdoc!(