diff --git a/tox.ini b/tox.ini
index fec2479..a1b599a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,12 +28,12 @@ commands = {posargs:py.test --cov=graphene_django graphene_django examples}
 
 [testenv:black]
 basepython = python3.7
-deps = black
+deps = -e.[dev]
 commands  =
     black --exclude "/migrations/" graphene_django examples setup.py --check
 
 [testenv:flake8]
 basepython = python3.7
-deps = flake8
+deps = -e.[dev]
 commands =
     flake8 graphene_django examples