diff --git a/composer.json b/composer.json
index ff6de92..f28234c 100644
--- a/composer.json
+++ b/composer.json
@@ -29,7 +29,8 @@
         "symfony/twig-bundle": "7.4.*",
         "symfony/uid": "7.4.*",
         "symfony/yaml": "^7.4",
-      "ext-sqlite3": "*"
+      "ext-sqlite3": "*",
+      "ext-mbstring": "*"
     },
     "config": {
         "optimize-autoloader": true,