diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 5c23a650b..8d83b93c4 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -11,9 +11,9 @@ submodules:
 
 # Set the version of Python and other tools you might need
 build:
-  os: ubuntu-20.04
+  os: ubuntu-22.04
   tools:
-    python: "3.9"
+    python: "3.10"
     # You can also specify other tool versions:
     # nodejs: "16"
     # rust: "1.55"
@@ -30,3 +30,4 @@ formats: []
 python:
    install:
    - requirements: requirements.txt
+   - requirements: requirements_dev.txt
diff --git a/docs/source/conf.py b/docs/source/conf.py
index c5697fa05..41a3d03f3 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -27,7 +27,7 @@
 # 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", "nbsphinx"]
+extensions = ["sphinx.ext.autosectionlabel", "nbsphinx", "sphinx_rtd_theme"]
 autosectionlabel_prefix_document = True
 nbsphinx_execute = "never"
 # Add any paths that contain templates here, relative to this directory.
@@ -42,8 +42,7 @@
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-#
-import sphinx_rtd_theme, nbsphinx
+
 
 html_theme = "sphinx_rtd_theme"
 
diff --git a/requirements_dev.txt b/requirements_dev.txt
index ee107d6d2..07e365f97 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -16,5 +16,6 @@ sphinx
 sphinx-autodoc-typehints
 sphinx-click
 sphinx-markdown-tables
+sphinx-rtd-theme
 tox
 xdoctest