diff --git a/.travis.yml b/.travis.yml
index 3829874..f9e7d42 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,8 @@ php:
   - hhvm
 #  - nightly
 
+dist: trusty
+
 env:
   - PHPSECLIB="2.0.0"
   - PHPSECLIB="2.0.1"