diff --git a/setup.py b/setup.py
index e722c909b..6bc288757 100644
--- a/setup.py
+++ b/setup.py
@@ -53,7 +53,7 @@ requires = [
     'snowballstemmer>=1.1',
     'babel>=1.3,!=2.0',
     'alabaster>=0.7,<0.8',
-    'sphinx_rtd_theme>=0.1,<0.2',
+    'sphinx_rtd_theme>=0.1,<2.0',
 ]
 extras_require = {
     # Environment Marker works for wheel 0.24 or later