diff --git a/.github/workflows/integrationtest.yml b/.github/workflows/integrationtest.yml
index 9e19b68..2dbfac5 100644
--- a/.github/workflows/integrationtest.yml
+++ b/.github/workflows/integrationtest.yml
@@ -138,7 +138,7 @@ jobs:
       # @link https://github.com/marketplace/actions/install-php-dependencies-with-composer
       - name: Install Composer dependencies
         if: ${{ matrix.php != '8.6' }}
-        uses: "ramsey/composer-install@3cf229dc2919194e9e36783941438d17239e8520" # 3.1.1
+        uses: "ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda" # 4.0.0
         with:
           composer-options: '--optimize-autoloader'
           # Bust the cache at least once a month - output format: YYYY-MM.
@@ -146,7 +146,7 @@ jobs:
 
       - name: Install Composer dependencies
         if: ${{ matrix.php == '8.6' }}
-        uses: "ramsey/composer-install@3cf229dc2919194e9e36783941438d17239e8520" # 3.1.1
+        uses: "ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda" # 4.0.0
         with:
           composer-options: '--ignore-platform-reqs --optimize-autoloader'
           custom-cache-suffix: $(date -u "+%Y-%m")
diff --git a/.github/workflows/phplint.yml b/.github/workflows/phplint.yml
index 3c080b2..9d4ad61 100644
--- a/.github/workflows/phplint.yml
+++ b/.github/workflows/phplint.yml
@@ -46,7 +46,7 @@ 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/quicktest.yml b/.github/workflows/quicktest.yml
index 13f49aa..a43ef71 100644
--- a/.github/workflows/quicktest.yml
+++ b/.github/workflows/quicktest.yml
@@ -72,7 +72,7 @@ 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:
           composer-options: '--optimize-autoloader'
           # Bust the cache at least once a month - output format: YYYY-MM.
diff --git a/.github/workflows/securitycheck.yml b/.github/workflows/securitycheck.yml
index 5b09f5d..f767be9 100644
--- a/.github/workflows/securitycheck.yml
+++ b/.github/workflows/securitycheck.yml
@@ -40,7 +40,7 @@ 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")