diff --git a/.travis.yml b/.travis.yml
index 6908249..5c628f3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
+dist: xenial
 language: python
 python:
-  - "2.7"
-  - "3.7"
+  - "2.7.15"
+  - "3.7.1"
 script:
   - pytest
\ No newline at end of file