diff --git a/.github/workflows/main-ci.yml b/.github/workflows/main-ci.yml
index 11e7c0a..e301d43 100644
--- a/.github/workflows/main-ci.yml
+++ b/.github/workflows/main-ci.yml
@@ -12,8 +12,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Build the Docker image
-      env:
-        PHP_VERSION: ${{ matrix.php_version }}
       run: |
         cp env-example .env
+        sed -i -- "s/PHP_VERSION=.*/PHP_VERSION=${{ matrix.php_version }}/g" .env
         docker-compose build ${{ matrix.service }}