diff --git a/requirements.txt b/requirements.txt
index 5c52fdc..2119072 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,4 @@ requests==2.20.0
 Werkzeug==0.15.3
 urllib3==1.24.2
 Jinja2==2.10
-attrs==18.1.0
+attrs==21.2.0