diff --git a/INSTALL.rst b/INSTALL.rst
index 681b104d01d6c16f2ecb8315531ea6fc33fe9e45..64040a112ea9f32d03541ae2c2dd898c3d738c7a 100644
--- a/INSTALL.rst
+++ b/INSTALL.rst
@@ -271,7 +271,7 @@ The following software is highly recommended though not strictly required:
 
 In addition, to build a copy of Kwant that has been checked-out directly from
 `its Git repository <http://git.kwant-project.org/kwant>`_, you will also need
-`Cython <http://cython.org/>`_ 0.17.1 or newer.  You do not need Cython to build
+`Cython <http://cython.org/>`_ 0.22 or newer.  You do not need Cython to build
 Kwant that has been unpacked from a source .tar.gz-file.
 
 
diff --git a/setup.py b/setup.py
index f0822b202128764efa21fc59c1e735394a5ca2ec..be8e3a7aa8a0cdbc2b2bd3aab9581c445ba83c76 100755
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,7 @@ CONFIG_FILE = 'build.conf'
 README_FILE = 'README.rst'
 README_END_BEFORE = 'See also in this directory:'
 STATIC_VERSION_FILE = 'kwant/_static_version.py'
-REQUIRED_CYTHON_VERSION = (0, 17, 1)
+REQUIRED_CYTHON_VERSION = (0, 22)
 NO_CYTHON_OPTION = '--no-cython'
 TUT_DIR = 'tutorial'
 TUT_GLOB = 'doc/source/tutorial/*.py'