diff --git a/.github/actions/ci/action.yml b/.github/actions/ci/action.yml
index 229d7ac..d0e3e94 100644
--- a/.github/actions/ci/action.yml
+++ b/.github/actions/ci/action.yml
@@ -8,7 +8,7 @@ inputs:
 runs:
   using: composite
   steps:
-    - uses: ruby/setup-ruby@v1
+    - uses: ruby/setup-ruby@319994f95fa847cf3fb3cd3dbe89f6dcde9f178f # v1
       with:
         ruby-version: ${{ inputs.ruby-version }}
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 996d50a..033b8ed 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -41,7 +41,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: ruby/setup-ruby@v1
+      - uses: ruby/setup-ruby@319994f95fa847cf3fb3cd3dbe89f6dcde9f178f # v1
         with:
           ruby-version: 3.0
 
diff --git a/.github/workflows/manual-publish-docs.yml b/.github/workflows/manual-publish-docs.yml
index 73b5d22..786f2a6 100644
--- a/.github/workflows/manual-publish-docs.yml
+++ b/.github/workflows/manual-publish-docs.yml
@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: ruby/setup-ruby@v1
+      - uses: ruby/setup-ruby@319994f95fa847cf3fb3cd3dbe89f6dcde9f178f # v1
         with:
           ruby-version: 3.0
 
diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index ac164c3..7d6fc2c 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -17,7 +17,7 @@ jobs:
       upload-tag-name: ${{ steps.release.outputs.tag_name }}
       gem-hash: ${{ steps.publish.outputs.gem-hash}}
     steps:
-      - uses: googleapis/release-please-action@v4
+      - uses: googleapis/release-please-action@16a9c90856f42705d54a6fda1823352bdc62cf38 # v4
         id: release
 
       - uses: actions/checkout@v4