diff --git a/.github/workflows/REUSABLE_backend.yml b/.github/workflows/REUSABLE_backend.yml
index 3eb58d60c5..68c7f23d1b 100644
--- a/.github/workflows/REUSABLE_backend.yml
+++ b/.github/workflows/REUSABLE_backend.yml
@@ -170,7 +170,7 @@ jobs:
           POSTGRES_USER: ${{ env.DB_USERNAME }}
           POSTGRES_PASSWORD: ${{ env.DB_PASSWORD }}
         ports:
-          - 15432:5432
+          - 5432
         options: >-
           --health-cmd pg_isready
           --health-interval 10s
@@ -220,7 +220,7 @@ jobs:
           fi
         working-directory: ${{ inputs.backend_directory }}
         env:
-          DB_PORT: ${{ matrix.driver == 'mysql' && 3306 || (matrix.driver == 'mariadb' && 3306 || 15432) }}
+          DB_PORT: ${{ contains(fromJson('["mysql", "mariadb"]'), matrix.driver) && job.services.mysql.ports['3306'] || matrix.driver == 'pgsql' && job.services.postgres.ports['5432'] }}
           DB_PREFIX: ${{ matrix.prefix }}
           DB_DRIVER: ${{ matrix.driver }}
           COMPOSER_PROCESS_TIMEOUT: 600
@@ -230,7 +230,7 @@ jobs:
 
     strategy:
       matrix:
-        php: ${{ fromJSON(inputs.php_versions) }}
+        php: ${{ fromJson(inputs.php_versions) }}
 
     services:
       mysql:
@@ -263,7 +263,7 @@ jobs:
       - name: Run PHPStan
         run: composer analyse:phpstan
         env:
-          DB_PORT: 3306
+          DB_PORT: ${{ job.services.mysql.ports['3306'] }}
           DB_PASSWORD: root
           COMPOSER_PROCESS_TIMEOUT: 600
           FLARUM_TEST_TMP_DIR_LOCAL: ./tmp