diff --git a/.travis.yml b/.travis.yml
index a3ad4e7..3a6dd10 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,13 @@
 language: python
 python:
-  - "3.4.2"
+  - "3.4"
+  - "3.5"
   - "3.6"
   - "3.7"
-  - "nightly"
+  - "3.8"  # 3.8 development branch
+  - "3.8-dev"  # 3.8 development branch
+  - "nightly"  # nightly build
 install:
-  - pip install -r requirements.txt
+  - pip install -r requirements-build.txt -r requirements-runtime.txt
 script:
   - python -m unittest discover -s tests