diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index c0ea6ca..8d0db6d 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -7,10 +7,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3
         
       - name: Set up Ruby
-        uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@3ff19f5e2baf30647122352b96108b1fbe250c64 # v1
         with:
           ruby-version: 3.0
           bundler-cache: true
@@ -19,7 +19,7 @@ jobs:
         run:  bundle exec rake yard
 
       - name: Deploy
-        uses: JamesIves/github-pages-deploy-action@4.1.5
+        uses: JamesIves/github-pages-deploy-action@0f24da7de3e7e135102609a4c9633b025be8411b # 4.1.5
         with:
           branch: gh-pages
           folder: doc
diff --git a/.github/workflows/jira-issue-create.yml b/.github/workflows/jira-issue-create.yml
index a238309..d7c9003 100644
--- a/.github/workflows/jira-issue-create.yml
+++ b/.github/workflows/jira-issue-create.yml
@@ -12,7 +12,7 @@ jobs:
     name: SDK Bot Jira Issue Creation
     steps:
       - name: Login
-        uses: atlassian/gajira-login@master
+        uses: atlassian/gajira-login@ca13f8850ea309cf44a6e4e0c49d9aa48ac3ca4c # v3
         env:
           JIRA_BASE_URL: ${{ secrets.JIRA_BASE_URL }}
           JIRA_USER_EMAIL: ${{ secrets.JIRA_USER_EMAIL }}
@@ -20,7 +20,7 @@ jobs:
 
       - name: Create issue
         id: create
-        uses: atlassian/gajira-create@master
+        uses: atlassian/gajira-create@1ff0b6bd115a780592b47bfbb63fc4629132e6ec # v3
         with:
           project: ${{ secrets.JIRA_PROJECT }}
           issuetype: Task
diff --git a/.github/workflows/pull-request-test.yml b/.github/workflows/pull-request-test.yml
index 40ae9be..1f9f0b0 100644
--- a/.github/workflows/pull-request-test.yml
+++ b/.github/workflows/pull-request-test.yml
@@ -10,9 +10,9 @@ jobs:
       matrix:
         ruby-version: ['2.7.8', '3.1', 'jruby']
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3
       - name: Set up Ruby
-        uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@3ff19f5e2baf30647122352b96108b1fbe250c64 # v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 06bade6..d0d7e41 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -27,15 +27,15 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3
 
     - name: Set up Ruby 2.7
-      uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@3ff19f5e2baf30647122352b96108b1fbe250c64 # v1
       with:
         ruby-version: 2.7
 
     - name: Set up Node.js 22
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
       with:
         node-version: 22
         cache: 'npm'