diff --git a/Dockerfile b/Dockerfile
index a651e80..1d51a5c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,6 +11,7 @@ RUN echo 'memory_limit = 512M' >> /usr/local/etc/php/conf.d/php.ini \
     && apt-get autoremove -y \
     && curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer \
     && composer global require hirak/prestissimo
+    && composer install -o --no-dev
 
 VOLUME ["/app/sessions"]