diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 828fe4af..d74cd0f1 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -20,7 +20,7 @@ jobs:
       contents: read
       security-events: write   # upload results to the Security tab
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v4
       - name: Initialize CodeQL
         uses: github/codeql-action/init@b0c4fd77f6c559021d78430ec4d0d169ae74a4eb # v3
         with:
diff --git a/.github/workflows/image.yml b/.github/workflows/image.yml
index 128125f0..08f52291 100644
--- a/.github/workflows/image.yml
+++ b/.github/workflows/image.yml
@@ -31,7 +31,7 @@ jobs:
       contents: read
       packages: write   # push to GHCR
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v4
 
       - name: Resolve image version
         id: meta
diff --git a/.github/workflows/publish-shim.yml b/.github/workflows/publish-shim.yml
index cf007268..7a2d6459 100644
--- a/.github/workflows/publish-shim.yml
+++ b/.github/workflows/publish-shim.yml
@@ -25,7 +25,7 @@ jobs:
       contents: read
       id-token: write   # PyPI trusted publishing (OIDC)
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v4
       - name: Set up Python
         uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
         with:
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index fffdd646..5926477d 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -23,7 +23,7 @@ jobs:
       id-token: write   # PyPI trusted publishing (OIDC)
 
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v4
 
       - name: Set up Python
         uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
@@ -76,7 +76,7 @@ jobs:
     needs: build-and-publish
 
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v4
         with:
           # --generate-notes diffs against the previous tag, so it needs the
           # history. The default shallow checkout produces empty notes.
@@ -108,7 +108,7 @@ jobs:
     needs: build-and-publish
 
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v4
 
       - name: Install mcp-publisher (pinned + checksum-verified)
         run: |
diff --git a/.github/workflows/scorecard.yml b/.github/workflows/scorecard.yml
index e3e01549..ee718274 100644
--- a/.github/workflows/scorecard.yml
+++ b/.github/workflows/scorecard.yml
@@ -17,7 +17,7 @@ jobs:
       id-token: write          # publish results to the public scorecard API
     steps:
       - name: Checkout
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v4
         with:
           persist-credentials: false
 
diff --git a/.github/workflows/security.yml b/.github/workflows/security.yml
index 6a1daf8a..2a49f6ae 100644
--- a/.github/workflows/security.yml
+++ b/.github/workflows/security.yml
@@ -22,7 +22,7 @@ jobs:
     name: SAST, secrets, dependencies
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v4
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
         with:
           python-version: "3.12"
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 241d40e3..96fe87a2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -28,7 +28,7 @@ jobs:
         python-version: ["3.11", "3.12"]
 
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v4
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5