diff --git a/.travis.yml b/.travis.yml
index 6facec8e7..a7287ae30 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,12 +1,9 @@
 language: python
-python:
-  - "3.6"      # current default Python on Travis CI
-  - "3.7"
-  - "3.8"
-  - "nightly"  # nightly build
 # command to install dependencies
 install:
   - pip install -r requirements.txt
+python:
+  - "3.6"      # current default Python on Travis CI
 # command to run tests
 script:
   - pytest