diff --git a/.github/workflows/docs.yaml b/.github/workflows/docs.yaml
index 80bbba7d..8c8298a0 100644
--- a/.github/workflows/docs.yaml
+++ b/.github/workflows/docs.yaml
@@ -24,7 +24,6 @@ jobs:
         run: |
           pip install -r requirements.txt
           make cython
-          pip install .
 
       - name: Sphinx Documentation Generator
         run: |
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 7447895d..88d87182 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -18,6 +18,7 @@ python:
   install:
     - method: pip
       path: .
+    - requirements: docs/requirements.txt
 
 sphinx:
   configuration: docs/conf.py
diff --git a/docs/conf.py b/docs/conf.py
index 6eb472af..ab0ad3c8 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-#
 # msgpack documentation build configuration file, created by
 # sphinx-quickstart on Sun Feb 24 14:20:50 2013.
 #
@@ -91,7 +89,7 @@
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = "sphinxdoc"
+html_theme = "sphinx_rtd_theme"
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
diff --git a/docs/requirements.txt b/docs/requirements.txt
new file mode 100644
index 00000000..8d45d0b6
--- /dev/null
+++ b/docs/requirements.txt
@@ -0,0 +1,2 @@
+sphinx~=7.2
+sphinx-rtd-theme~=1.3.0
diff --git a/tox.ini b/tox.ini
index 369eddcf..49364be9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -33,6 +33,6 @@ commands=
 [testenv:sphinx]
 changedir = docs
 deps =
-    sphinx
+    -r docs/requirements.txt
 commands =
     sphinx-build -n -v -W --keep-going -b html -d {envtmpdir}/doctrees . {envtmpdir}/html