diff --git a/dockerfile b/dockerfile
index 3775d43..933fbda 100644
--- a/dockerfile
+++ b/dockerfile
@@ -2,4 +2,5 @@ FROM php:7.4-apache
 COPY . /var/www/html
 RUN docker-php-ext-install pdo_mysql
 RUN docker-php-ext-install gd
+RUN docker-php-ext-install zlib
 CMD ["apache2ctl", "-D", "FOREGROUND"]