diff --git a/docs/installation.rst b/docs/installation.rst
index 273ffa1..d0db606 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -33,5 +33,5 @@ Building pyrocksdb
     $ virtualenv pyrocks_test
     $ cd pyrocks_test
     $ . bin/active
-    $ pip install Cython
+    $ pip install "Cython>=0.20"
     $ pip install git+git://github.com/stephan-hof/pyrocksdb.git
diff --git a/setup.py b/setup.py
index 6eec643..0b9ba73 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,7 @@ setup(
     name="pyrocksdb",
     install_requires=[
         'setuptools',
-        'Cython',
+        'Cython>=0.20',
     ],
     package_dir={'rocksdb': 'rocksdb'},
     packages=find_packages('.'),