diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 0f225a0..db3f59d 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -37,7 +37,7 @@ 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@v3"
+      uses: "ramsey/composer-install@v4"
       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+' || '' }}