diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bafe68f..59fe987 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -37,17 +37,21 @@ jobs:
             -   name: Validate composer.json and composer.lock
                 run: composer validate --strict
 
+            -   name: Get Composer cache directory
+                id: composer-cache-dir
+                run: echo "dir=$(composer config cache-files-dir)" >> "$GITHUB_OUTPUT"
+
             -   name: Cache Composer packages
                 id: composer-cache
                 uses: actions/cache@v5
                 with:
-                    path: vendor
-                    key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+                    path: ${{ steps.composer-cache-dir.outputs.dir }}
+                    key: ${{ runner.os }}-php-${{ matrix.php-versions }}-${{ matrix.composer-prefer }}-${{ hashFiles('composer.json') }}
                     restore-keys: |
-                        ${{ runner.os }}-php-
+                        ${{ runner.os }}-php-${{ matrix.php-versions }}-
 
             -   name: Install dependencies
-                run: COMPOSER_ROOT_VERSION=6.0.x-dev composer update --prefer-dist --no-interaction --no-progress ${{ matrix.composer-prefer }}
+                run: COMPOSER_ROOT_VERSION=6.0.x-dev composer update --prefer-dist --no-interaction --no-progress --prefer-stable ${{ matrix.composer-prefer }}
 
             -   name: Run phpstan
                 run: ./vendor/bin/phpstan analyse