diff --git a/docs/requirements.txt b/docs/requirements.txt
index 733cc96..f04d21e 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,7 +2,7 @@
 # to generate documentation.
 
 sphinx==4.4.0
-sphinx-autodoc-typehints==1.16.0
+sphinx-autodoc-typehints==1.21.8
 m2r2==0.3.2
 tomlkit==0.8.0