diff --git a/composer.json b/composer.json
index 8960a103..abfa51a0 100644
--- a/composer.json
+++ b/composer.json
@@ -38,7 +38,8 @@
     },
     "replace": {
         "symfony/polyfill-ctype": "*",
-        "symfony/polyfill-intl-normalizer": "*"
+        "symfony/polyfill-intl-normalizer": "*",
+        "symfony/polyfill-mbstring": "*"
     },
     "config": {
         "sort-packages": true,
@@ -61,4 +62,4 @@
             ]
         }
     }
-}
\ No newline at end of file
+}