diff --git a/.github/workflows/security-scan.yml b/.github/workflows/security-scan.yml
index b5efb06..a62054a 100644
--- a/.github/workflows/security-scan.yml
+++ b/.github/workflows/security-scan.yml
@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v1
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index af0883a..1853486 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
         with:
           fetch-depth: '2'