diff --git a/.github/workflows/build-phar.yml b/.github/workflows/build-phar.yml
index 1dd7588d..d53f7089 100644
--- a/.github/workflows/build-phar.yml
+++ b/.github/workflows/build-phar.yml
@@ -45,7 +45,7 @@ jobs:
               composer-${{ runner.os }}-
               composer-
     - name: Install dependencies
-      run: composer require humbug/box --dev
+      run: composer config minimum-stability dev && composer require humbug/box --dev
     - name: Build phar
       run: composer run box compile
     - uses: actions/upload-artifact@v1