diff --git a/Dockerfile b/Dockerfile
index 76dbd866..4b844541 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,6 +7,7 @@ RUN mv "$PHP_INI_DIR/php.ini-production" "$PHP_INI_DIR/php.ini" \
 	&& apt-get --yes --no-install-recommends install \
 		zlib1g-dev \
 		libmemcached-dev \
+	&& rm -rf /var/lib/apt/lists/* \
 	&& pecl install memcached \
 	&& docker-php-ext-enable memcached \
 	&& sed -ri -e 's!/var/www/html!${APACHE_DOCUMENT_ROOT}!g' /etc/apache2/sites-available/*.conf \