diff --git a/.github/workflows/mcu-core.yaml b/.github/workflows/mcu-core.yaml
index acc4677..3443e48 100644
--- a/.github/workflows/mcu-core.yaml
+++ b/.github/workflows/mcu-core.yaml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-20.04
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3.1.0
         with:
           repository: 'watterott/senseBox-MCU'
           ref: 'master'
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 2f80039..a1c943f 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-20.04
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3.1.0
 
       - name: Copy arduino directory into /var/www/html
         run: |
diff --git a/.github/workflows/validate-stable.yaml b/.github/workflows/validate-stable.yaml
index 981f662..fef8e09 100644
--- a/.github/workflows/validate-stable.yaml
+++ b/.github/workflows/validate-stable.yaml
@@ -10,7 +10,7 @@ jobs:
     name: Setup test matrix
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3.1.0
 
       - name: Extract all versions
         id: set-matrix
@@ -28,7 +28,7 @@ jobs:
         version: ${{ fromJson(needs.setup.outputs.matrix) }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3.1.0
 
       - name: Install Arduino CLI
         uses: arduino/setup-arduino-cli@v1.1.1