diff --git a/.github/workflows/analysis.yml b/.github/workflows/analysis.yml
index 67a9425820..db3db6b3f4 100644
--- a/.github/workflows/analysis.yml
+++ b/.github/workflows/analysis.yml
@@ -13,7 +13,7 @@ jobs:
       matrix:
         java: [ 11, 16 ]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@v2
         with:
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6ab01c1d73..ae49d0550c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -15,7 +15,7 @@ jobs:
       matrix:
         java: [ 11, 16 ]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@v2
         with:
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index acbb6b873d..767c133454 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -30,7 +30,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.3.4
     - name: Setup Java JDK
       uses: actions/setup-java@v2
       with:
diff --git a/.github/workflows/examples.yml b/.github/workflows/examples.yml
index 39b9ed579a..c44f77ce83 100644
--- a/.github/workflows/examples.yml
+++ b/.github/workflows/examples.yml
@@ -13,7 +13,7 @@ jobs:
       matrix:
         java: [ 11, 16 ]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@v2
         with:
diff --git a/.github/workflows/gradle-wrapper-validation.yml b/.github/workflows/gradle-wrapper-validation.yml
index b7256f2ec9..792b87079d 100644
--- a/.github/workflows/gradle-wrapper-validation.yml
+++ b/.github/workflows/gradle-wrapper-validation.yml
@@ -6,5 +6,5 @@ jobs:
     name: "Validation"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - uses: gradle/wrapper-validation-action@v1.0.3
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index ea015b1361..b0eeddb26a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -7,7 +7,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Set up JDK 11
         uses: actions/setup-java@v2
         with: