diff --git a/.travis.yml b/.travis.yml
index 54358172..2d079be2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,7 +14,7 @@ env:
 
 # Versions of go that are explicitly supported by gonum.
 go:
- - 1.5beta1
+ - 1.5beta2
  - 1.3.3
  - 1.4.2