diff --git a/.github/workflows/cs.yml b/.github/workflows/cs.yml
index 361bef5..9789354 100644
--- a/.github/workflows/cs.yml
+++ b/.github/workflows/cs.yml
@@ -61,7 +61,7 @@ jobs:
       # Install dependencies and handle caching in one go.
       # @link https://github.com/marketplace/actions/install-php-dependencies-with-composer
       - name: Install Composer dependencies
-        uses: ramsey/composer-install@3cf229dc2919194e9e36783941438d17239e8520 # 3.1.1
+        uses: ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda # 4.0.0
         with:
           # Bust the cache at least once a month - output format: YYYY-MM.
           custom-cache-suffix: $(date -u "+%Y-%m")
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 81439fa..9f80424 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -89,7 +89,7 @@ jobs:
       # Install dependencies and handle caching in one go.
       # @link https://github.com/marketplace/actions/install-php-dependencies-with-composer
       - name: Install Composer dependencies
-        uses: ramsey/composer-install@3cf229dc2919194e9e36783941438d17239e8520 # 3.1.1
+        uses: ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda # 4.0.0
         with:
           # Bust the cache at least once a month - output format: YYYY-MM.
           custom-cache-suffix: $(date -u "+%Y-%m")