Fix failing CI

https://docs.travis-ci.com/user/reference/osx/#brew-outdated
tcoopman · Aug 12, 2018 · 757072f · 757072f
1 parent 9b568be
commit 757072f
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,8 @@
 os: osx
 language: node_js
 before_install:
-  - brew update && brew install libpng
+  - brew update
+  - brew outdated libpng || brew upgrade libpng
 node_js:
   - "node"
   - "9"