diff --git a/setup.cfg b/setup.cfg
index 3199e03..6070c65 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -17,6 +17,7 @@ classifier =
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.4
+    Programming Language :: Python :: 3.5
 
 [files]
 packages =
diff --git a/tox.ini b/tox.ini
index 2bf45f1..501e63f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.0
-envlist = py34-constraints,py27-constraints,pypy-constraints,pep8-constraints
+envlist = py35-constraints,py34-constraints,py27-constraints,pypy-constraints,pep8-constraints
 skipsdist = True
 
 [testenv]