diff --git a/docs/requirements.txt b/docs/requirements.txt
index da946818..2b5e1764 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,7 +2,7 @@ alabaster==0.7.12
 appdirs==1.4.4
 aspy.yaml==1.3.0
 astroid==2.7.3
-attrs==21.2.0
+attrs==21.4.0
 Babel==2.9.1
 backports.entry-points-selectable==1.1.0
 black==21.8b0
diff --git a/requirements.txt b/requirements.txt
index b1829d79..a61d4282 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 appdirs==1.4.4
 aspy.yaml==1.3.0
 astroid==2.7.3
-attrs==21.2.0
+attrs==21.4.0
 backports.entry-points-selectable==1.1.0
 black==21.8b0
 certifi==2021.5.30