diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1581011..2c2aa43 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -39,7 +39,7 @@ jobs:
           # - os: macos-14
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: taiki-e/checkout-action@v1
+      - uses: taiki-e/checkout-action@b13d20b7cda4e2f325ef19895128f7ff735c0b3d # v1
       - uses: Boshen/setup-rust@main
         with:
           save-cache: ${{ github.ref_name == 'main' }}
@@ -50,7 +50,7 @@ jobs:
     name: Lint
     runs-on: ubuntu-latest
     steps:
-      - uses: taiki-e/checkout-action@v1
+      - uses: taiki-e/checkout-action@b13d20b7cda4e2f325ef19895128f7ff735c0b3d # v1
 
       - uses: Boshen/setup-rust@main
         with: