diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 33c2a61..88bca9f 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -8,6 +8,9 @@
 # Required
 version: 2
 
+sphinx:
+  configuration: docs/conf.py
+
 build:
   os: ubuntu-20.04
   tools:
diff --git a/docs/conf.py b/docs/conf.py
index 29d378b..1a225bf 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -94,19 +94,9 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-on_rtd = os.environ.get("READTHEDOCS", None) == "True"
-
-if not on_rtd:  # only import and set the theme if we're building docs locally
-    try:
-        import sphinx_rtd_theme
-
-        html_theme = "sphinx_rtd_theme"
-        html_theme_path = [sphinx_rtd_theme.get_html_theme_path(), "."]
-    except:
-        html_theme = "default"
-        html_theme_path = ["."]
-else:
-    html_theme_path = ["."]
+import sphinx_rtd_theme
+
+html_theme = "sphinx_rtd_theme"
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 797aa04..979f568 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,5 +2,6 @@
 #
 # SPDX-License-Identifier: Unlicense
 
-sphinx>=4.0.0
+sphinx
 sphinxcontrib-jquery
+sphinx-rtd-theme