diff --git a/.github/workflows/nanvix-ci.yml b/.github/workflows/nanvix-ci.yml
index 2e23b147e..589b82ef9 100644
--- a/.github/workflows/nanvix-ci.yml
+++ b/.github/workflows/nanvix-ci.yml
@@ -28,7 +28,7 @@ jobs:
     if: github.event_name != 'schedule' && github.event_name != 'workflow_dispatch'
     uses: nanvix/workflows/.github/workflows/nanvix-ci.yml@v2.0.1
     with:
-      zutil-version: "v0.9.0"
+      zutil-version: "v0.9.1"
       docker-image: "ghcr.io/nanvix/toolchain-quickjs@sha256:e6fc5d3d4ed338c1416c08dbe9d8ac1353f696046716774bcc3ac6d41d2375ad" # yamllint disable-line rule:line-length
       platforms: '["microvm"]'
       memory-sizes: '["128mb","256mb"]'
@@ -44,7 +44,7 @@ jobs:
     if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
     uses: nanvix/workflows/.github/workflows/nanvix-ci.yml@v2.0.1
     with:
-      zutil-version: "v0.9.0"
+      zutil-version: "v0.9.1"
       docker-image: "ghcr.io/nanvix/toolchain-quickjs@sha256:e6fc5d3d4ed338c1416c08dbe9d8ac1353f696046716774bcc3ac6d41d2375ad" # yamllint disable-line rule:line-length
       platforms: '["microvm"]'
       memory-sizes: '["128mb","256mb"]'
diff --git a/z.ps1 b/z.ps1
index 07b39020a..bc196fbf2 100644
--- a/z.ps1
+++ b/z.ps1
@@ -15,7 +15,7 @@ $zutilVersion = if ($env:NANVIX_ZUTIL_VERSION) {
     $env:NANVIX_ZUTIL_VERSION
 }
 else {
-    "0.9.0"
+    "0.9.1"
 }
 $zutilVersion = $zutilVersion -replace "^v", ""
 
diff --git a/z.sh b/z.sh
index b2770dcb7..3291ab06a 100755
--- a/z.sh
+++ b/z.sh
@@ -7,7 +7,7 @@
 
 set -euo pipefail
 
-PINNED_VERSION="0.9.0"
+PINNED_VERSION="0.9.1"
 RAW_ZUTIL_VERSION="${NANVIX_ZUTIL_VERSION:-$PINNED_VERSION}"
 ZUTIL_VERSION="${RAW_ZUTIL_VERSION#v}"
 REPO_ROOT="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd -P)"