diff --git a/.travis.yml b/.travis.yml
index 1fa62963a..e193d6ee9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,7 @@ addons:
   homebrew:
     packages:
     - tree
+    update: true
 
 # Only clone the most recent commit.
 git: