diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 5f3c47d..f8cdef2 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -18,21 +18,21 @@ jobs:
         with:
           php-version: ${{ matrix.php-versions }}
 
-      - name: Validate composer.json and composer.lock
-        run: composer validate
-
-      - name: Cache Composer packages
+      - name: Get Composer Cache Directory
         id: composer-cache
-        uses: actions/cache@v2
+        run: |
+          echo "::set-output name=dir::$(composer config cache-files-dir)"
+          
+      - uses: actions/cache@v2
         with:
-          path: vendor
-          key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
           restore-keys: |
-            ${{ runner.os }}-php-
+            ${{ runner.os }}-composer-
 
       - name: Install dependencies
         if: steps.composer-cache.outputs.cache-hit != 'true'
-        run: composer install --prefer-dist --no-progress --no-suggest
+        run: composer install --no-progress --no-suggest --prefer-dist --optimize-autoloader
 
       - name: Run test suite
         run: composer run-script test