From 1cf1645e04a2611f6966076b9640f07ea1e9911a Mon Sep 17 00:00:00 2001
From: Robert Nishihara <robertnishihara@gmail.com>
Date: Thu, 5 Jul 2018 00:26:49 -0700
Subject: [PATCH] Require Cython 0.27 for setup. (#2313)

* Require Cython 0.27 for setup.

* Make Cython version even more specific.

* Restrict to any 0.27 version
---
 python/setup.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/python/setup.py b/python/setup.py
index dd63e18e11ab..7dbeb1e8a9f1 100644
--- a/python/setup.py
+++ b/python/setup.py
@@ -143,7 +143,7 @@ def has_ext_modules(self):
         "six >= 1.0.0",
         "flatbuffers"
     ],
-    setup_requires=["cython >= 0.23"],
+    setup_requires=["cython >= 0.27, < 0.28"],
     extras_require=extras,
     entry_points={"console_scripts": ["ray=ray.scripts.scripts:main"]},
     include_package_data=True,