diff --git a/.travis.yml b/.travis.yml
index c533c0bbf..112b80d86 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,17 +18,20 @@ matrix:
       sudo: false
       node_js: "9"
     - os: osx
-      osx_image: xcode8
+      osx_image: xcode8.3
       node_js: "4"
     - os: osx
-      osx_image: xcode8
+      osx_image: xcode8.3
       node_js: "6"
     - os: osx
-      osx_image: xcode8
+      osx_image: xcode8.3
       node_js: "8"
     - os: osx
-      osx_image: xcode8
+      osx_image: xcode8.3
       node_js: "9"
+before_script:
+  - npm install license-checker
+  - ./node_modules/.bin/license-checker --production --unknown --exclude=Apache-2.0,ISC,MIT | grep '^'
 after_success:
   - npm install coveralls
   - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js