diff --git a/requirements.txt b/requirements.txt
index 86383dd8..dc310d08 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,4 +11,4 @@ tornado==5.1.1; python_version<"3.6"
 tornado==6.0.4; python_version>="3.6"
 trio==0.16.0; python_version>="3.6"
 outcome==1.0.1; python_version>="3.5"
-attrs==19.3.0; python_version>="3.5"
+attrs==20.2.0; python_version>="3.5"