diff --git a/tox.ini b/tox.ini
index 1c21089..03f83a2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -21,6 +21,7 @@ deps =
         pg: psycopg2
         pylint<1.8
         pylint-django<0.8.1
+        attrs<19.2
         pytest-cov
         pytest-random
         pytest-mock