diff --git a/.travis.yml b/.travis.yml
index d73495a..ea51343 100644
--- 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+  - brew outdated libpng || brew upgrade libpng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"