diff --git a/Dockerfile b/Dockerfile
index 7c2577996..ee63686a6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
     libgd-dev
 
 RUN a2enmod rewrite
-RUN docker-php-ext-install mysql mysqli bcmath intl gd sockets
+RUN docker-php-ext-install mysql mysqli bcmath intl gd sockets mbstring
 RUN echo "date.timezone = \"\${PHP_TIMEZONE}\"" > /usr/local/etc/php/conf.d/timezone.ini
 
 WORKDIR /app