diff --git a/.github/workflows/ci.js.yml b/.github/workflows/ci.js.yml
index 77b69127..26e6bb6d 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@v2
+      - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5
       - name: Use Node.js LTS (16.x)
         uses: actions/setup-node@v1
         with:
@@ -32,7 +32,7 @@ jobs:
         node-version: [14.x, 16.x]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v1
         with:
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 8e9b3fce..a17a5439 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5
 
       # 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 655b4a6a..8bf67a7e 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@v2
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5
 
       - name: Use Node.js LTS (16.x)
         uses: actions/setup-node@v1
@@ -33,7 +33,7 @@ jobs:
 
     steps:
       - name: Checkout PR
-        uses: actions/checkout@v2
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5
 
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v1
diff --git a/.github/workflows/verify-code-formatting.yml b/.github/workflows/verify-code-formatting.yml
index 4e15f04a..c7f686d5 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@v2
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5
       - name: Use Node.js LTS (16.x)
         uses: actions/setup-node@v1
         with: