diff --git a/.travis.yml b/.travis.yml
index 02fc6a7..42aa5f4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,10 @@
 language: node_js
+before_install:
+# package-lock.json was introduced in npm@5
+- '[[ $(node -v) =~ ^v9.*$ ]] || npm install -g npm@latest' # skipped when using node 9
+- npm install -g greenkeeper-lockfile@1
+before_script: greenkeeper-lockfile-update
+after_script: greenkeeper-lockfile-upload
 jobs:
   include:
     - script: npm test
diff --git a/README.md b/README.md
index 7688cad..3094749 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # moment-locales-webpack-plugin
 
-[![npm](https://img.shields.io/npm/v/moment-locales-webpack-plugin.svg)](https://www.npmjs.com/package/moment-locales-webpack-plugin) [![Travis](https://img.shields.io/travis/iamakulov/moment-locales-webpack-plugin.svg)](https://travis-ci.org/iamakulov/moment-locales-webpack-plugin)
+[![npm](https://img.shields.io/npm/v/moment-locales-webpack-plugin.svg)](https://www.npmjs.com/package/moment-locales-webpack-plugin) [![Travis](https://img.shields.io/travis/iamakulov/moment-locales-webpack-plugin.svg)](https://travis-ci.org/iamakulov/moment-locales-webpack-plugin) [![Greenkeeper badge](https://badges.greenkeeper.io/iamakulov/moment-locales-webpack-plugin.svg)](https://greenkeeper.io/)
 
 > Easily remove unused Moment.js locales when building with webpack