diff --git a/.travis.yml b/.travis.yml
index 74cf2371..ce050920 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,7 +13,7 @@ python:
 before_install:
   - "export DISPLAY=:99.0"
   - "sh -e /etc/init.d/xvfb start"
-  - npm install less less-plugin-clean-css grunt-cli
+  - npm install less@2.7 less-plugin-clean-css grunt-cli
   - export PATH=`pwd`/node_modules/.bin:$PATH
   - ./manage.sh install_geckodriver ~/drivers
   - export PATH=~/drivers:$PATH