diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index fa1509a0..2e8e4ff3 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -8,10 +8,10 @@ jobs:
         python-version: [3.8, 3.11]
     steps:
       - name: Check out repository code
-        uses: actions/checkout@v4
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
         with:
           python-version: ${{ matrix.python-version }}
 
@@ -37,10 +37,10 @@ jobs:
         node-version: [16]
     steps:
       - name: Check out repository code
-        uses: actions/checkout@v4
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
 
       - name: Set up Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: ${{ matrix.node-version }}
 
diff --git a/.github/workflows/integration-test.yaml b/.github/workflows/integration-test.yaml
index 46f4aaf0..eac33859 100644
--- a/.github/workflows/integration-test.yaml
+++ b/.github/workflows/integration-test.yaml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
         with:
           path: mitx-grading-library