diff --git a/tox.ini b/tox.ini
index c6dc61155..bb421daa5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -59,6 +59,9 @@ source_paths =
 commands =
     {[base]install_and_test} {[base]py26_packages}
     python tests/lock_test.py
+deps =
+    setuptools==36.8.0
+    wheel==0.29.0
 
 [testenv]
 commands =
@@ -68,6 +71,12 @@ setenv =
     PYTHONPATH = {toxinidir}
     PYTHONHASHSEED = 0
 
+[testenv:py33]
+commands =
+    {[testenv]commands}
+deps =
+    wheel==0.29.0
+
 [testenv:py27-oldest]
 commands =
     {[testenv]commands}