1 files changed, 1 insertions, 1 deletions
diff --git a/setup.py b/setup.py
index e8829d49..050043b3 100644
--- a/setup.py
+++ b/setup.py
@@ -97,8 +97,8 @@ setup(
             "ipaddress>=1.0.15, <1.1",
         ],
         'dev': [
+            "tox>=2.3, <3",
             "mock>=2.0, <2.1",
-            "flake8>=2.5.4, <3",
             "pytest>=2.8.7, <2.10",
             "pytest-cov>=2.2.1, <2.3",
             "pytest-timeout>=1.0.0, <1.1",