diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 2703f6f..6569969 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -5,6 +5,9 @@ on: [push, pull_request]
 permissions:
   contents: read
 
+env:
+  COMPOSER_ROOT_VERSION: dev-main
+
 jobs:
   build:
 
@@ -13,6 +16,11 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
+    - name: Validate composer.json and composer.lock
+      uses: php-actions/composer@v6
+      with:
+        command: validate --strict
+
     - name: Cache Composer packages
       id: composer-cache
       uses: actions/cache@v4
@@ -27,10 +35,5 @@ jobs:
       with:
         args: --prefer-dist --no-progress
 
-    - name: Validate composer.json and composer.lock
-      uses: php-actions/composer@v6
-      with:
-        command: validate --strict
-
     - name: Run test suite
       uses: php-actions/phpunit@v4