diff --git a/tox.ini b/tox.ini
index 24155a9a..46792253 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,8 +2,10 @@
 envlist = docs, py26, py27, pypy, py33, py34
 
 [testenv]
-deps = blinker
-commands = python run-tests.py []
+deps=
+    blinker
+    pytest
+commands = py.test []
 
 
 [testenv:docs]