diff --git a/tox.ini b/tox.ini
index f1c1bcd82256..49255fbe95f5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -151,5 +151,5 @@ commands = isort -c --df {[base]lint_targets}
 [testenv:mypy]
 deps =
     {[base]deps}
-extras = all,mypy
+extras = all,mypy,dev
 commands = mypy