diff --git a/docs/requirements.txt b/docs/requirements.txt
index 613e285..bc86d68 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,7 +2,7 @@
 # to generate documentation.
 
 sphinx>=4.4.0,<4.5.0
-sphinx-autodoc-typehints>=1.17.0,<1.18.0
+sphinx-autodoc-typehints>=1.17.0,<1.19.0
 sphinxcontrib-apidoc>=0.3.0
 furo>=2022.1.2
 m2r2>=0.3.0,<0.4.0