diff --git a/.github/workflows/ci.js.yml b/.github/workflows/ci.js.yml
index 37feedd..fabd869 100644
--- a/.github/workflows/ci.js.yml
+++ b/.github/workflows/ci.js.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-22.04
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
       - name: Use Node.js LTS (18.x)
         uses: actions/setup-node@v3
         with:
@@ -32,7 +32,7 @@ jobs:
         node-version: [18.x]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3
         with:
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 79da8e4..b704bc3 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
diff --git a/.github/workflows/pr.ci.js.yml b/.github/workflows/pr.ci.js.yml
index f7d1c13..e746010 100644
--- a/.github/workflows/pr.ci.js.yml
+++ b/.github/workflows/pr.ci.js.yml
@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout PR
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
 
       - name: Use Node.js LTS (18.x)
         uses: actions/setup-node@v3
@@ -33,7 +33,7 @@ jobs:
 
     steps:
       - name: Checkout PR
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
 
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3
diff --git a/.github/workflows/verify-code-formatting.yml b/.github/workflows/verify-code-formatting.yml
index 813ae61..faa2069 100644
--- a/.github/workflows/verify-code-formatting.yml
+++ b/.github/workflows/verify-code-formatting.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: 'Checkout code'
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
 
       - name: 'Verify formatting of all files'
         run: ./bin/check-formatting.sh