diff --git a/.travis.yml b/.travis.yml
index 1f218c81..59a50313 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -26,6 +26,7 @@ matrix:
   - python:  3.6
   - python:  3.7
   - python:  3.8
+  - python:  3.9-dev
   - python:  pypy3.5
 before_install:
   - echo "running under $TRAVIS_PYTHON_VERSION"