diff --git a/docs/conf.py b/docs/conf.py
index 6022a79..f97f476 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -34,7 +34,7 @@
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = ['sphinx.ext.autosectionlabel', 'sphinxcontrib.plantuml']
+extensions = ['sphinx.ext.autosectionlabel']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
@@ -59,7 +59,7 @@
   rst_prolog = subs.read()
 
 # Minimum version of sphinx required
-needs_sphinx = '2.4'
+needs_sphinx = '5.3.0'
 
 # -- Options for HTML output -------------------------------------------------
 
diff --git a/docs/requirements.txt b/docs/requirements.txt
index b208795..5f18d26 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,9 +2,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # SPDX-FileCopyrightText: Copyright TF-RMM Contributors.
 #
-graphviz
-Sphinx>=2.4,<3.0.0
-sphinx-rtd-theme
-sphinxcontrib-plantuml
+sphinx==5.3.0
+sphinx-rtd-theme==2.0.0
 docutils==0.16
-jinja2<3.1
+jinja2==3.1.3