diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 8865f07..485f4a0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -37,9 +37,9 @@ jobs:
           - 6379:6379
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
 
-      - uses: ruby/setup-ruby@v1
+      - uses: ruby/setup-ruby@c4e5b1316158f92e3d49443a9d58b31d25ac0f8f # v1.306.0
         env:
           RSPEC_CORE: ${{ matrix.rspec-core-version }}
         with: