diff --git a/.github/workflows/cs.yml b/.github/workflows/cs.yml
index 7d8755e36..11b15ddcb 100644
--- a/.github/workflows/cs.yml
+++ b/.github/workflows/cs.yml
@@ -58,7 +58,7 @@ 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@a35c6ebd3d08125aaf8852dff361e686a1a67947" # 3.2.0
+        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/lint.yml b/.github/workflows/lint.yml
index 7064a3b66..cba1616da 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -42,7 +42,7 @@ 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@a35c6ebd3d08125aaf8852dff361e686a1a67947" # 3.2.0
+        uses: "ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda" # 4.0.0
         with:
           # For PHP "nightly", we need to install with ignore platform reqs as not all dependencies may allow it yet.
           composer-options: ${{ matrix.php == '8.6' && '--ignore-platform-req=php+' || '' }}
diff --git a/.github/workflows/quicktest.yml b/.github/workflows/quicktest.yml
index dd2157db6..b2406b14b 100644
--- a/.github/workflows/quicktest.yml
+++ b/.github/workflows/quicktest.yml
@@ -50,7 +50,7 @@ jobs:
       # Install dependencies and handle caching in one go.
       # @link https://github.com/marketplace/actions/install-php-dependencies-with-composer
       - name: Install Composer dependencies - normal
-        uses: "ramsey/composer-install@a35c6ebd3d08125aaf8852dff361e686a1a67947" # 3.2.0
+        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 7855f51f6..d6a942dc1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -62,7 +62,7 @@ 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@a35c6ebd3d08125aaf8852dff361e686a1a67947" # 3.2.0
+        uses: "ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda" # 4.0.0
         with:
           # For PHP "nightly", we need to install with ignore platform reqs as not all dependencies may allow it yet.
           composer-options: ${{ matrix.php == '8.6' && '--ignore-platform-req=php+' || '' }}