diff --git a/README.md b/README.md
index 10a8e210..d4bc4cc4 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ We use the [Sphinx PyData Theme](https://pydata-sphinx-theme.readthedocs.io/en/s
 
 Before beginning any work, review the [contributing section](#contributing).
 
-To build the documentation, python3 (3.11 or greater) and `pip3` are required.
+To build the documentation, python3 (3.12 or greater) and `pip3` are required.
 All required python modules are listed in `requirements.txt`.
 Install them with `pip3 install -r requirements.txt`. _virtual environment recommended_
 
diff --git a/requirements.txt b/requirements.txt
index a40bf7d4..5b3f5f23 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 setuptools==78.1.1
 pydata-sphinx-theme>=0.16.1
-sphinx-design>=0.6.1
-sphinx==8.2.3
+sphinx-design>=0.7.0
+sphinx==9.1.0
 sphinx_copybutton>=0.5.2
 sphinx-reredirects
 sphinx-autobuild