diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ba197bc..de8aa19 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-24.04
     needs: setup
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           ref: ${{ github.ref }}
       - name: Login to Docker Hub
diff --git a/.github/workflows/release-dev-version.yml b/.github/workflows/release-dev-version.yml
index b2d59cd..82787cc 100644
--- a/.github/workflows/release-dev-version.yml
+++ b/.github/workflows/release-dev-version.yml
@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-24.04
     needs: setup
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           ref: ${{ github.ref }}
       - name: Login to Docker Hub
diff --git a/.github/workflows/release-productive-version.yml b/.github/workflows/release-productive-version.yml
index dc0a491..800b751 100644
--- a/.github/workflows/release-productive-version.yml
+++ b/.github/workflows/release-productive-version.yml
@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-24.04
     needs: setup
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           ref: ${{ github.ref }}
       - name: Login to Docker Hub