diff --git a/.travis.yml b/.travis.yml
index c59dc9f..5b3aaac 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,8 @@
+dist: xenial   # required for Python >= 3.7
 language: python
 python:
-    - "3"
+    - "3.7"
+    - "nightly"  # nightly build
 
 install:
     - pip install tox-travis coveralls