diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6632fbc..3bd0d9b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,13 +6,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
 
     - name: Apt install
       run: cat Aptfile | sudo xargs apt-get install
 
     - name: Python setup
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@65d7f2d534ac1bc67fcd62888c5f4f3d2cb2b236 # v4
       with:
         python-version: "3.11"
 
@@ -42,14 +42,14 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
 
     - name: Apt install
       run: cat Aptfile | sudo xargs apt-get install
 
 
     - name: Python setup
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@65d7f2d534ac1bc67fcd62888c5f4f3d2cb2b236 # v4
       with:
         python-version: "3.8"