diff --git a/.travis.yml b/.travis.yml
index a3b9d1d944..909fca4d6b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,7 @@
 # see travis-ci.org for details
 
 language: csharp
-mono: 4.0.0
+mono: 4.2.1
 
 # http://docs.travis-ci.com/user/migrating-from-legacy
 sudo: false