diff --git a/setup.py b/setup.py
index d70f6fc963..7d5f4050d6 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@ def get_static_files(path):
     long_description = readme_note + fobj.read()
 
 install_requires = [
-    'tornado>=5.0,<6',
+    'tornado>=4.0,<5',
     'python-daemon<3.0',
 ]