diff --git a/.travis.yml b/.travis.yml
index 97becc17..bdaef3a7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,7 +15,7 @@ before_install:
   - chmod 600 deploy_key
   - eval `ssh-agent -s`
   - ssh-add deploy_key
-  - npm install
+  - yarn --pure-lockfile
   - composer install --prefer-dist --no-dev
 
 script: ./publish.sh