diff --git a/composer.json b/composer.json
index ad2dc2b..233544c 100644
--- a/composer.json
+++ b/composer.json
@@ -7,6 +7,7 @@
 		"ext-psr": ">=1.2",
         "ext-redis": "*",
         "ext-yaml": "*",
+        "ext-mbstring": "*",
         "robmorgan/phinx": "^0.10.6",
         "league/oauth2-client": "^2.3",
         "league/oauth2-github": "^2.0",