diff --git a/tox.ini b/tox.ini
index 660e716..4529ea9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,9 @@ deps =
 commands = nosetests -v tests/unit --with-coverage --cover-package=bootstrapvz --cover-inclusive
 
 [testenv:integration]
-deps = nose
+deps =
+    nose
+    Pyro4 >= 4.26
 commands = nosetests -v tests/integration --with-coverage --cover-package=bootstrapvz --cover-inclusive
 
 [testenv:docs]