diff --git a/tox.ini b/tox.ini
index b7648cf..3df09d5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,6 +4,7 @@ envlist = {py26,py27,py33,py34,py35,py36,py37}
 extras = testing
 deps =
     py26,py33: pytest>=3.0.7,<3.3
+    py27,py34: pytest<5
     py26,py33: setuptools<37
     coverage: coverage
 setenv =