diff --git a/Dockerfile b/Dockerfile
index 88c563b..d6be9c2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,6 +14,7 @@ RUN apk add --no-cache \
     php7-mbstring \
     php7-pecl-apcu \
     php7-pecl-yaml \
+    php7-session \
     php7-xml \
     php7-zip