diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index ef9ddc6..2046e3d 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -5,12 +5,16 @@
 # Required
 version: 2
 
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.12"
+
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
    configuration: docs/conf.py
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-   version: 3.8
    install:
-   - requirements: docs/requirements.txt
\ No newline at end of file
+   - requirements: docs/requirements.txt
diff --git a/docs/conf.py b/docs/conf.py
index 4324663..77ed362 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -52,8 +52,8 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-# html_theme = 'alabaster'
 html_theme = 'sphinx_rtd_theme'
+
 # html_theme_options = {
 #     'analytics_id': 'G-CH3JS5076R',  # Provided by Google in your dashboard
 #     'analytics_anonymize_ip': False,
@@ -74,3 +74,8 @@
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
+# python3 -m sphinx.ext.intersphinx https://docs.python-requests.org/en/master/objects.inv
+intersphinx_mapping = {
+    'requests': ('https://docs.python-requests.org/en/master/', None),
+    'python': ('https://docs.python.org/3', None)
+}
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4f61efd..fd49df5 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,7 +1,8 @@
-sphinx==3.5.4
+sphinx==5.1.1
 sphinxcontrib-bibtex
 sphinx-copybutton
 pandas
 pynmrstar>=3.0.4
 plotly>=4.5.4
-numpy>=1.15.0
\ No newline at end of file
+numpy>=1.15.0
+sphinx_rtd_theme