diff --git a/.github/workflows/gate.yml b/.github/workflows/gate.yml
index 49fe1a8..0a111bc 100644
--- a/.github/workflows/gate.yml
+++ b/.github/workflows/gate.yml
@@ -30,7 +30,7 @@ jobs:
     env:
       PYTHONHASHSEED: "0"
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5  # v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v4
 
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065  # v5
         with:
diff --git a/.github/workflows/publish-pyodide.yml b/.github/workflows/publish-pyodide.yml
index b478723..cccd52c 100644
--- a/.github/workflows/publish-pyodide.yml
+++ b/.github/workflows/publish-pyodide.yml
@@ -29,7 +29,7 @@ jobs:
     env:
       PYTHONHASHSEED: "0"
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5  # v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v4
 
       # Tag push must match VERSION (mirrors mcp). Skipped for dispatch.
       - name: Verify tag matches VERSION
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 50e5152..c3c1525 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -53,7 +53,7 @@ jobs:
           owner: pineforge-4pass
           repositories: pineforge-codegen-oss,pineforge-release
 
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5  # v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v4
         with:
           fetch-depth: 0
           # App token bypasses the main ruleset for the release commit/tag push.
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8a0b2a7..6493b10 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -26,7 +26,7 @@ jobs:
     env:
       PYTHONHASHSEED: "0"   # determinism; lockstep with the Phase 2 Pyodide gate
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5  # v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v4
 
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065  # v5
         with: