diff --git a/docs/source/conf.py b/docs/source/conf.py
index a00551ed..543eadbc 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -14,17 +14,17 @@
 import sys
 sys.path.insert(0, os.path.abspath('./../..'))
 
-import sphinx_rtd_theme
+import hio
 
 
 # -- Project information -----------------------------------------------------
 
 project = 'hio'
-copyright = '2020-2021, Samuel M. Smith'
+copyright = '2020-2026, Samuel M. Smith'
 author = 'Samuel M. Smith'
 
 # The full version, including alpha/beta/rc tags
-release = '0.3.4'
+release = hio.__version__
 version = release
 
 # -- General configuration ---------------------------------------------------
diff --git a/docs/source/requirements.txt b/docs/source/requirements.txt
index ebb08536..4928a6f2 100644
--- a/docs/source/requirements.txt
+++ b/docs/source/requirements.txt
@@ -1,2 +1,5 @@
 myst_parser >= 0.14.0
 sphinx-autoapi >= 1.8.1
+Sphinx >= 8.1.3
+sphinx-rtd-theme >= 3.0.1
+ordered-set >= 4.1.0