diff --git a/requirements.txt b/requirements.txt
index b19158b56..922c3cb20 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-attrs~=21.2
+attrs~=21.3
 dill~=0.3
 Jinja2~=3.0
 parse~=1.19