diff --git a/.gitignore b/.gitignore
index bbe7d22..33dfc28 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 __pycache__
 dist/
 build/
+/.tox
diff --git a/.travis.yml b/.travis.yml
index 6f34248..5ee9ae1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,16 @@
 sudo: false
+
 language: python
+
 python:
   - "2.7"
+  - "3.4"
   - "3.5"
-install:
-  - if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then pip install unittest2; fi
-  - pip install asgiref twisted autobahn
-script: if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then python -m unittest2; else python -m unittest; fi
+
+env:
+  - TWISTED_RELEASE="twisted"
+  - TWISTED_RELEASE="twisted==16.0.0"
+
+install: pip install $TWISTED_RELEASE -e .
+
+script: python -m unittest discover
diff --git a/setup.py b/setup.py
index 462cece..d0e0a92 100755
--- a/setup.py
+++ b/setup.py
@@ -40,6 +40,7 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Topic :: Internet :: WWW/HTTP',
     ],
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..7554262
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,8 @@
+# We test against the oldest supported Twisted release, and the current release.
+[tox]
+envlist = py{27,34,35}-twisted-{old,new}
+
+[testenv]
+deps =
+    twisted-old: twisted==16.0.0
+commands = python -m unittest discover