diff --git a/docs/requirements.txt b/docs/requirements.txt
index e5e9cd9..1df357b 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,4 @@
-Sphinx==4.0.2
+Sphinx==6.0.0
 sphinx-rtd-theme==0.5.2
 sphinxcontrib-napoleon==0.7
 sphinxcontrib-bibtex==2.3.0