diff --git a/.travis.yml b/.travis.yml
index c2999ad..10ae4c6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,18 @@
 language: python
 python:
+  # https://github.com/travis-ci/travis-ci/issues/2219#issuecomment-41804942
+  # https://snarky.ca/how-to-use-your-project-travis-to-help-test-python-itself/
   - "2.6"
   - "2.7"
   - "3.2"
   - "3.3"
   - "3.4"
+  - "3.5"
+  - "3.5-dev"
+  - "3.6"
+  - "3.6-dev"
+  - "3.7-dev"
+  - "nightly"
 before_install: sudo apt-get install libxml2-dev libxslt-dev
 # command to install dependencies
 install:
diff --git a/setup.py b/setup.py
index dda3184..2a317a8 100644
--- a/setup.py
+++ b/setup.py
@@ -76,6 +76,9 @@ setup(
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.2",
         "Programming Language :: Python :: 3.3",
+        "Programming Language :: Python :: 3.4",
+        "Programming Language :: Python :: 3.5",
+        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: Implementation :: CPython",
         "Topic :: Internet :: WWW/HTTP",
         "Topic :: Software Development :: Pre-processors",