diff --git a/docker/Dockerfile b/docker/Dockerfile
index adf8f00..ee7dcd8 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -65,7 +65,7 @@ WORKDIR /var/www/davis
 
 # Install Composer 2, then dependencies
 RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
-RUN APP_ENV=prod composer install --no-ansi --no-dev --no-interaction --no-progress --optimize-autoloader
+RUN APP_ENV=prod COMPOSER_ALLOW_SUPERUSER=1 composer install --no-ansi --no-dev --no-interaction --no-progress --optimize-autoloader
 
 # PHP-FPM healthcheck
 RUN set -xe && echo "pm.status_path = /status" >> /usr/local/etc/php-fpm.d/zz-docker.conf