diff --git a/docs/source/conf.py b/docs/source/conf.py
index 79f6ef0..930ef44 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.mathjax', 'sphinx.ext.autodoc', 'sphinx_rtd_theme']
+extensions = ['sphinx.ext.mathjax', 'sphinx.ext.autodoc']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']