diff --git a/backend.dockerfile b/backend.dockerfile
index 8ee4d96..dbcaa22 100644
--- a/backend.dockerfile
+++ b/backend.dockerfile
@@ -46,7 +46,7 @@ ENV WP_SENDGRID_FROM_NAME ${WP_SENDGRID_FROM_NAME}
 
 ENV WIAAS_CUSTOMER_INTERFACE ${WIAAS_CUSTOMER_INTERFACE}
 
-RUN apt-get update && apt-get install -y git unzip gnupg mysql-client sudo
+RUN apt-get update && apt-get install -y git unzip gnupg mysql-client sudo libpng-dev
 
 COPY docker/php/composer.phar /usr/local/bin/composer
 RUN chmod 755 /usr/local/bin/composer
@@ -57,7 +57,7 @@ RUN chmod +x /usr/local/bin/wp
 COPY docker/php/setup.sh /init-scripts/
 RUN chmod +x /init-scripts/setup.sh
 
-RUN docker-php-ext-install pdo pdo_mysql mysqli opcache
+RUN docker-php-ext-install pdo pdo_mysql mysqli opcache gd zip mbstring
 RUN a2enmod rewrite
 COPY docker/php/000-default.conf /etc/apache2/sites-available