diff --git a/.github/workflows/docker-build.yml b/.github/workflows/docker-build.yml
index e28c8e0..8839943 100644
--- a/.github/workflows/docker-build.yml
+++ b/.github/workflows/docker-build.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
 
       - name: Build Dockerfile
         run: docker build .
diff --git a/.github/workflows/docker-image.yml b/.github/workflows/docker-image.yml
index b05fc0b..fd55e84 100644
--- a/.github/workflows/docker-image.yml
+++ b/.github/workflows/docker-image.yml
@@ -8,7 +8,7 @@ jobs:
   docker:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
     - name: Build the Docker image
       run: docker build . --file Dockerfile --tag ${{ secrets.DOCKER_URL }}/${{ secrets.REPO }}/mtbexporter:latest --label maintainer="Niklas Reimer <${{ secrets.EMAIL }}>"
     - name: Login to Docker registry
diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index d26accf..789c9aa 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -10,7 +10,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
     - name: Set up JDK 11
       uses: actions/setup-java@v3
       with:
diff --git a/.github/workflows/sonar.yml b/.github/workflows/sonar.yml
index 445ee33..3d41a8a 100644
--- a/.github/workflows/sonar.yml
+++ b/.github/workflows/sonar.yml
@@ -11,7 +11,7 @@ jobs:
     if: github.repository == 'nr23730/MtbExporter'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
       - name: Set up JDK 11