diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 734b615a1..45851b2d7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -183,6 +183,9 @@ jobs:
           key: "php-${{ matrix.php-version }}-composer-locked-${{ hashFiles('composer.lock') }}"
           restore-keys: "php-${{ matrix.php-version }}-composer-locked-"
 
+      - name: "Symfony 4.3 version"
+        run: perl -pi -e 's#"(symfony/.*)":\s*".*"#"$1":"'"4.3.*"'"#' composer.json
+
       - name: "Install dependencies"
         run: composer update --no-interaction --no-progress