diff --git a/tox.ini b/tox.ini
index 0c4393277..b24842ff4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,7 +20,7 @@ setenv = QT_QPA_PLATFORM_PLUGIN_PATH={envdir}/Lib/site-packages/PyQt5/plugins/pl
 passenv = DISPLAY XAUTHORITY HOME
 deps =
     -r{toxinidir}/requirements.txt
-    py==1.4.27
+    py==1.4.28
     pytest==2.7.1
     pytest-capturelog==0.7
     pytest-qt==1.3.0
@@ -79,7 +79,7 @@ commands = {envpython} -m pep257 scripts tests qutebrowser --ignore=D102,D103,D2
 setenv = LANG=en_US.UTF-8
 deps =
     -r{toxinidir}/requirements.txt
-    py==1.4.27
+    py==1.4.28
     pytest==2.7.1
     pyflakes==0.9.0
     pytest-flakes==1.0.0
@@ -90,7 +90,7 @@ commands =
 [testenv:pep8]
 deps =
     -r{toxinidir}/requirements.txt
-    py==1.4.27
+    py==1.4.28
     pytest==2.7.1
     pep8==1.6.2
     pytest-pep8==1.0.6
@@ -101,7 +101,7 @@ commands =
 [testenv:mccabe]
 deps =
     -r{toxinidir}/requirements.txt
-    py==1.4.27
+    py==1.4.28
     pytest==2.7.1
     mccabe==0.3
     pytest-mccabe==0.1