diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 2be122e9..be00c2a6 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@v4
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/deploy-to-gh-pages.yml b/.github/workflows/deploy-to-gh-pages.yml
index 2f166d07..7fc84703 100644
--- a/.github/workflows/deploy-to-gh-pages.yml
+++ b/.github/workflows/deploy-to-gh-pages.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       with:
         ref: master
         path: website
diff --git a/.github/workflows/linter.yml b/.github/workflows/linter.yml
index 899707a0..0aadf503 100644
--- a/.github/workflows/linter.yml
+++ b/.github/workflows/linter.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
     - uses: actions/setup-node@v4
       with: