diff --git a/Dockerfile b/Dockerfile
index 39750d9..8830b00 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -40,11 +40,12 @@ RUN apk add --no-cache \
     php7-gd \
     php7-ctype \
     php7-xmlwriter \
-    php7-tokenizer
+    php7-tokenizer \
+    composer
 
-#WORKDIR /var/lib/roundcube
-#RUN composer require masterminds/html5
-#WORKDIR /
+WORKDIR /var/lib/roundcube
+RUN composer require roundcube/carddav
+WORKDIR /
 
 RUN chown -R nginx:nginx /var/lib/roundcube