1 files changed, 1 insertions, 0 deletions
diff --git a/composer.json b/composer.json
index 51762b84098..ff94ef05d7f 100644
--- a/composer.json
+++ b/composer.json
@@ -14,6 +14,7 @@
     "require": {
         "ext-json": "*",
         "ext-libxml": "*",
+        "ext-mbstring": "*",
         "ext-pdo": "*",
         "ext-simplexml": "*",
         "ext-xmlreader": "*",