diff --git a/docker-test.sh b/docker-test.sh
index e340369e..6bf5360e 100644
--- a/docker-test.sh
+++ b/docker-test.sh
@@ -1,6 +1,7 @@
 export NPROCS=1 && export JOBS=1 && export CXX=g++-4.9 && export PGUSER=postgres
 
-npm install
+npm install -g yarn@0.27.5
+yarn
 
  /etc/init.d/postgresql start