diff --git a/tox.ini b/tox.ini
index 124cd9f..1f3b989 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py33,py34,pypy,pypy3,tornado31,tornado32,tornado40
+envlist = py27,py33,py34,pypy,pypy3,tornado31,tornado32,tornado40,tornado43
 toxworkdir = {toxinidir}/build/tox
 skip_missing_intepreters = true
 
@@ -28,3 +28,8 @@ deps =
 deps =
 	-rtest-requirements.txt
 	tornado>=4.0,<4.1
+
+[testenv:tornado43]
+deps =
+	-rtest-requirements.txt
+	tornado>=4.3,<4.4