diff --git a/tox.ini b/tox.ini
index ee54156f4..63093ed75 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,7 +17,7 @@ usedevelop = true
 [testenv:unittests]
 setenv = QT_QPA_PLATFORM_PLUGIN_PATH={envsitepackagesdir}/PyQt5/plugins/platforms
 deps =
-    py==1.4.26
+    py==1.4.27
     pytest==2.7.0
     pytest-capturelog==0.7
     pytest-qt==1.3.0