diff --git a/mediawiki/Dockerfile b/mediawiki/Dockerfile
index 7d40be2..2e5d8d1 100644
--- a/mediawiki/Dockerfile
+++ b/mediawiki/Dockerfile
@@ -79,6 +79,8 @@ RUN wget https://raw.githubusercontent.com/composer/getcomposer.org/76a7060ccb93
 
 RUN mv /var/www/html/composer.local.json-sample /var/www/html/composer.local.json
 
+ENV COMPOSER_ALLOW_SUPERUSER=1
+
 RUN cd /var/www/html && composer update && cd -
 
 RUN mkdir /var/log/mediawiki && chown www-data:www-data /var/log/mediawiki