diff --git a/requirements.txt b/requirements.txt
index 3cce46fb5e..99fce38667 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ antlr4-python3-runtime==4.8
 appdirs==1.4.4
 aspy.yaml==1.3.0
 attackcti==0.3.4.4
-attrs==21.2.0
+attrs==21.4.0
 backports.entry-points-selectable==1.1.1
 CacheControl==0.12.10
 certifi==2021.10.8