diff --git a/setup.cfg b/setup.cfg
index 3657362..86ce232 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -28,7 +28,7 @@ setup_requires =
   setuptools >= 40.6
   pip >= 10
 install_requires =
-  attrs
+  attrs >= 18.2.0
   typing-extensions
 
 [options.packages.find]