diff --git a/.github/workflows/build-master.yml b/.github/workflows/build-master.yml
index 2717a1f..6a539fe 100644
--- a/.github/workflows/build-master.yml
+++ b/.github/workflows/build-master.yml
@@ -18,7 +18,7 @@ jobs:
     steps:
 
       - name: Check out
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Get time
         uses: gerred/actions/current-time@master
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 6c748e0..1d4274e 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -39,7 +39,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.3.4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/docker.yaml b/.github/workflows/docker.yaml
index 3e88fea..d7164bb 100644
--- a/.github/workflows/docker.yaml
+++ b/.github/workflows/docker.yaml
@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Check out
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Get tag
         uses: olegtarasov/get-tag@v2
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 1eecc90..d4dc619 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -16,7 +16,7 @@ jobs:
     steps:
 
       - name: Check out
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Get tag
         uses: olegtarasov/get-tag@v2