diff --git a/.github/workflows/publish-code-docs.yml b/.github/workflows/publish-code-docs.yml
index 1846860..cb81b34 100644
--- a/.github/workflows/publish-code-docs.yml
+++ b/.github/workflows/publish-code-docs.yml
@@ -11,7 +11,7 @@ jobs:
   deploy-code-documentation:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.1
+      - uses: actions/checkout@v2.4.0
 
       - name: Create documentation
         run: |
diff --git a/.github/workflows/publish-release.yml b/.github/workflows/publish-release.yml
index 0921efc..c437f88 100644
--- a/.github/workflows/publish-release.yml
+++ b/.github/workflows/publish-release.yml
@@ -9,7 +9,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.4.0
       - name: Set up JDK 13
         uses: actions/setup-java@v1
         with:
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index f648c59..5de201f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.4.0
       - name: Set up JDK
         uses: actions/setup-java@v1
         with: