diff --git a/.github/workflows/phpstan.yml b/.github/workflows/phpstan.yml
index b0cde6a..71efb60 100644
--- a/.github/workflows/phpstan.yml
+++ b/.github/workflows/phpstan.yml
@@ -11,10 +11,10 @@ jobs:
     name: phpstan
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
 
       - name: Setup PHP
-        uses: shivammathur/setup-php@v2
+        uses: shivammathur/setup-php@0f7f1d08e3e32076e51cae65eb0b0c871405b16e # v2
         with:
           php-version: '8.4'
           coverage: none
diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index e29f22e..60d6a79 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -24,10 +24,10 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
 
       - name: Setup PHP
-        uses: shivammathur/setup-php@v2
+        uses: shivammathur/setup-php@0f7f1d08e3e32076e51cae65eb0b0c871405b16e # v2
         with:
           php-version: ${{ matrix.php }}
           extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, bcmath, soap, intl, gd, exif, iconv, imagick, fileinfo
diff --git a/.github/workflows/update-changelog.yml b/.github/workflows/update-changelog.yml
index 0cdea23..6caaa1d 100644
--- a/.github/workflows/update-changelog.yml
+++ b/.github/workflows/update-changelog.yml
@@ -10,18 +10,18 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
         with:
           ref: main
 
       - name: Update Changelog
-        uses: stefanzweifel/changelog-updater-action@v1
+        uses: stefanzweifel/changelog-updater-action@a938690fad7edf25368f37e43a1ed1b34303eb36 # v1
         with:
           latest-version: ${{ github.event.release.name }}
           release-notes: ${{ github.event.release.body }}
 
       - name: Commit updated CHANGELOG
-        uses: stefanzweifel/git-auto-commit-action@v5
+        uses: stefanzweifel/git-auto-commit-action@b863ae1933cb653a53c021fe36dbb774e1fb9403 # v5
         with:
           branch: main
           commit_message: Update CHANGELOG