diff --git a/.travis.yml b/.travis.yml
index b63f3e8..04e3afe 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,7 +7,7 @@ python:
   - "3.6"
   - "3.7"
   - "3.8"
-  - "3.9-dev"
+  - "nightly"
   - "pypy2.7-6.0"
   - "pypy3.5-6.0"