diff --git a/.travis.yml b/.travis.yml
index cfb602c0859..4747a9c2eaf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,8 @@ notifications:
 
 language: php
 
+dist: trusty
+
 php:
     # We only run the highest and lowest supported versions to reduce the load on travis-ci.org.
     - 7.2