diff --git a/setup.cfg b/setup.cfg
index 1b4f3fe4e..c81d81e96 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -16,6 +16,8 @@ classifier =
     Programming Language :: Python
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.7
+    Programming Language :: Python :: 3.4
+    Programming Language :: Python :: 3.5
     Topic :: Internet :: Name Service (DNS)
 
 [global]
diff --git a/tox.ini b/tox.ini
index fd575bcb8..624f1a134 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = py34,py27,flake8
+envlist = py35,py34,py27,flake8
 skipsdist = True
 
 [testenv]
@@ -31,6 +31,10 @@ passenv = http_proxy
 commands =
   ostestr --blacklist_file=tests-py3.txt
 
+[testenv:py35]
+commands =
+  ostestr --blacklist_file=tests-py3.txt
+
 [testenv:docs]
 commands = rm -rf doc/build
            sphinx-build -E -W -b html doc/source doc/build/html