diff --git a/.github/workflows/ci.js.yml b/.github/workflows/ci.js.yml
index 35adb53..3ad94cd 100644
--- a/.github/workflows/ci.js.yml
+++ b/.github/workflows/ci.js.yml
@@ -12,9 +12,9 @@ jobs:
     runs-on: ubuntu-22.04
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5
       - name: Use Node.js LTS (14.x)
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@f1f314fca9dfce2769ece7d933488f076716723e
         with:
           node-version: 14.x
 
@@ -32,9 +32,9 @@ jobs:
         node-version: [12.x, 14.x, 15.x]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@f1f314fca9dfce2769ece7d933488f076716723e
         with:
           node-version: ${{ matrix.node-version }}
 
diff --git a/.github/workflows/pr.ci.js.yml b/.github/workflows/pr.ci.js.yml
index 1ad2455..01c253d 100644
--- a/.github/workflows/pr.ci.js.yml
+++ b/.github/workflows/pr.ci.js.yml
@@ -11,10 +11,10 @@ jobs:
 
     steps:
       - name: Checkout PR
-        uses: actions/checkout@v2
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5
 
       - name: Use Node.js LTS (14.x)
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@f1f314fca9dfce2769ece7d933488f076716723e
         with:
           node-version: 14.x
 
@@ -33,10 +33,10 @@ 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
+        uses: actions/setup-node@f1f314fca9dfce2769ece7d933488f076716723e
         with:
           node-version: ${{ matrix.node-version }}
 
diff --git a/.github/workflows/verify-code-formatting.yml b/.github/workflows/verify-code-formatting.yml
index f4c7a37..c04c69d 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: 'Verify formatting of all files'
         run: ./bin/check-formatting.sh