diff --git a/.github/workflows/validate-swagger.yml b/.github/workflows/validate-swagger.yml
index 04541c1..e913119 100644
--- a/.github/workflows/validate-swagger.yml
+++ b/.github/workflows/validate-swagger.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Validate Swagger
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
       - run: yarn
       - name: Validate OpenAPI definition
         run: yarn validate