diff --git a/Dockerfile b/Dockerfile
index 3dfdc3c..7462ce2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -35,6 +35,11 @@ RUN apk --no-cache add \
     php7-xmlreader \
     php7-zip \
     php7-zlib \
+    php7-xmlwriter \
+    php7-xsl \
+    php7-pcntl \
+    php7-posix \
+    php7-sockets \
     nginx \
     runit \
     curl \