diff --git a/.github/workflows/dockerbuild.yaml b/.github/workflows/dockerbuild.yaml
index 5b4bc66..86a295c 100644
--- a/.github/workflows/dockerbuild.yaml
+++ b/.github/workflows/dockerbuild.yaml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           ref: ${{ github.event.workflow_run.head_sha }}
           fetch-depth: 0
diff --git a/.github/workflows/python_lint.yaml b/.github/workflows/python_lint.yaml
index 03c4939..99a7d53 100644
--- a/.github/workflows/python_lint.yaml
+++ b/.github/workflows/python_lint.yaml
@@ -6,5 +6,5 @@ jobs:
     lint:
         runs-on: ubuntu-latest
         steps:
-            - uses: actions/checkout@v3
+            - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
             - uses: psf/black@stable
\ No newline at end of file
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index cadaaf1..d01d757 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     concurrency: release
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           fetch-depth: 0
           token: ${{ secrets.GITHUB_TOKEN }}