diff --git a/tools/ci/setup_js_env.sh b/tools/ci/setup_js_env.sh
index dc6d2ede67d..f0d739b4eeb 100644
--- a/tools/ci/setup_js_env.sh
+++ b/tools/ci/setup_js_env.sh
@@ -5,6 +5,8 @@ if ! cmp --silent bower.json vendor/assets/bower_components/bower.json; then
   rm -rf vendor/assets/bower_components
 fi
 
+yarn
+
 if [ -d vendor/assets/bower_components ]; then
   # Using bower_components from cache
   echo "bower assets installed... moving on."