diff --git a/image/discourse_test/Dockerfile b/image/discourse_test/Dockerfile
index 8cdef88..a9318ef 100644
--- a/image/discourse_test/Dockerfile
+++ b/image/discourse_test/Dockerfile
@@ -15,10 +15,12 @@ RUN gem update bundler --force &&\
 
 RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add - &&\
     echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list &&\
+    curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add - &&\
+    echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list &&\
     apt-get update &&\
-    apt-get install -y google-chrome-stable &&\
+    apt-get install -y google-chrome-stable yarn &&\
     npm install -g eslint babel-eslint &&\
-    cd /var/www/discourse && sudo -E -u discourse -H npm install chrome-launcher chrome-remote-interface
+    cd /var/www/discourse && yarn install
 
 WORKDIR /var/www/discourse
 ENV LANG en_US.UTF-8