diff --git a/docs/conf.py b/docs/conf.py
index 3c253ba..3fe88b2 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -130,7 +130,7 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'default'
+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
index 006a578..16c48be 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,4 @@
 Sphinx
 repoze.sphinx.autointerface
 zope.principalannotation
+sphinx_rtd_theme