diff --git a/Dockerfile b/Dockerfile
index 7198c4c..8d01c4c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,6 +20,7 @@ RUN apt-get update && \
 		wget \
 		rpm \
 		gawk \
-	&& apt-get clean && \
-	gem install fpm && \
-	rm -rf /var/lib/apt/lists/* /var/tmp/* /tmp/*
+	&& apt-get clean \
+	&& gem install public_suffix -v 4.0.7 \
+	&& gem install fpm --no-ri --no-rdoc \
+	&& rm -rf /var/lib/apt/lists/* /var/tmp/* /tmp/*