diff --git a/.travis.yml b/.travis.yml
index 2d8b46aa9254278dd9fab2faf44569786657b83e..5cda24bb33412b370233028239538300c06f7177 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@
 ---
 ## Machine config
 dist: bionic
+version: '~> 1.0'
 sudo: required
 services:
   - docker