diff --git a/Dockerfile b/Dockerfile
index 505eab9..9936891 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,6 +15,7 @@ RUN \
     php7-pgsql \
     php7-posix \
     php7-fpm \
+    php7-session \
     tar
 RUN ln -sf /usr/bin/php7 /usr/bin/php