diff --git a/docs/requirements.txt b/docs/requirements.txt
index 1c887c5..5376b48 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,3 @@
-sphinx==4.3.0
+sphinx==4.3.1
 sphinx_rtd_theme==1.0.0
 m2r2==0.3.1