diff --git a/tox.ini b/tox.ini
index a128e3d..ada0609 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,6 +16,7 @@ deps =
   pytest-cov
   pytest-django
   pytest>=3.3.0,<4.1
+  attrs<19.2
   pylint<1.8
   pylint-django<0.8.1
   mock