diff --git a/setup.py b/setup.py
index 9883ecd..21bb458 100644
--- a/setup.py
+++ b/setup.py
@@ -18,7 +18,7 @@ setup(
     packages=['releases'],
     install_requires=[
         'semantic_version<3.0',
-        'sphinx>=1.3',
+        'sphinx>=1.3,<2',
     ],
     classifiers=[
         'Development Status :: 5 - Production/Stable',