diff --git a/Dockerfile b/Dockerfile
index 9af7e99..95a0f26 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ FROM node:4.2
 RUN apt-get update && \
     apt-get install -y xvfb iceweasel
 
-RUN npm install -g slimerjs phantomjs manet
+RUN npm install -g slimerjs phantomjs manet@0.4.7
 
 COPY bin/start_manet.sh /usr/local/bin/