diff --git a/tox.ini b/tox.ini
index 48e6991..1b1895d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,7 @@ commands = {posargs}
 
 # Dogfood our current mastera version
 [testenv:dogfood]
-basepython = python3
+basepython = python3.5
 skip_install = true
 deps =
     wheel