diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 2ff0ba86..c9b75f9f 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -35,7 +35,7 @@ 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/lhci.yml b/.github/workflows/lhci.yml
index 70dd33d9..8a4a95f3 100644
--- a/.github/workflows/lhci.yml
+++ b/.github/workflows/lhci.yml
@@ -4,7 +4,7 @@ jobs:
   lighthouse:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Audit URLs using Lighthouse
         uses: treosh/lighthouse-ci-action@v7
         with:
diff --git a/.github/workflows/master.yml b/.github/workflows/master.yml
index 5707b2e2..25a5638e 100644
--- a/.github/workflows/master.yml
+++ b/.github/workflows/master.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: fetch source code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: install node
         uses: actions/setup-node@v2