diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index c90ca9c..e9348b0 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -20,18 +20,18 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@v3
+        uses: github/codeql-action/init@c37a8b7cd97e31de3fcbd9d84c401870edeb8d34 # v3
         with:
           languages: ${{ matrix.language }}
           queries: +security-and-quality
 
       - name: Autobuild
-        uses: github/codeql-action/autobuild@v3
+        uses: github/codeql-action/autobuild@c37a8b7cd97e31de3fcbd9d84c401870edeb8d34 # v3
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@v3
+        uses: github/codeql-action/analyze@c37a8b7cd97e31de3fcbd9d84c401870edeb8d34 # v3
         with:
           category: "/language:${{ matrix.language }}"
diff --git a/.github/workflows/label_new_issues.yml b/.github/workflows/label_new_issues.yml
index 42f1848..197e346 100644
--- a/.github/workflows/label_new_issues.yml
+++ b/.github/workflows/label_new_issues.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Add 'needs response' label to new issues
-        uses: actions-ecosystem/action-add-labels@v1
+        uses: actions-ecosystem/action-add-labels@18f1af5e3544586314bbe15c0273249c770b2daf # v1
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           labels: 'needs response'
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 14999bf..0fd31a6 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -28,9 +28,9 @@ jobs:
       pull-requests: write
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
       - name: Prepare the next main release
-        uses: Adyen/release-automation-action@v1.4.0
+        uses: Adyen/release-automation-action@3e5694d5b365f344a62436e84049511ef318ecf5 # v1.4.0
         with:
           token: ${{ secrets.ADYEN_AUTOMATION_BOT_ACCESS_TOKEN }}
           develop-branch: main
diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index a6e9c70..9a99150 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -12,8 +12,8 @@ jobs:
         ruby: [2.7, '3.0', 3.1, 3.2, head]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v6
-    - uses: ruby/setup-ruby@v1
+    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
+    - uses: ruby/setup-ruby@8a836efbcebe5de0fe86b48a775b7a31b5c70c93 # v1
       with:
         ruby-version: ${{ matrix.ruby }}
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
diff --git a/.github/workflows/rubygems_release.yml b/.github/workflows/rubygems_release.yml
index 98478d1..28b792d 100644
--- a/.github/workflows/rubygems_release.yml
+++ b/.github/workflows/rubygems_release.yml
@@ -9,10 +9,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
       - name: Release Gem on RubyGems
         if: contains(github.ref, 'refs/tags/v')
-        uses: cadwallion/publish-rubygems-action@v1.1.0
+        uses: cadwallion/publish-rubygems-action@94a6f4cd5350581749c569b5001eecc864e3ad0b # v1.1.0
         env:
           GITHUB_TOKEN: ${{secrets.TOKEN_RUBYGEMS_RELEASES_WITH_EXPIRATION}}
           RUBYGEMS_API_KEY: ${{secrets.RUBYGEMS_API_KEY}}
diff --git a/.github/workflows/stale.yml b/.github/workflows/stale.yml
index 52bc65c..2320f72 100644
--- a/.github/workflows/stale.yml
+++ b/.github/workflows/stale.yml
@@ -7,7 +7,7 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@v9
+      - uses: actions/stale@5bef64f19d7facfb25b37b414482c7164d639639 # v9
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           stale-issue-message: 'This issue has been automatically marked as stale due to inactivity and will be closed in 7 days if no further activity occurs.'