diff --git a/doc/sources/guide/packaging-ios.rst b/doc/sources/guide/packaging-ios.rst
index 0c10ad1fb..41215c700 100644
--- a/doc/sources/guide/packaging-ios.rst
+++ b/doc/sources/guide/packaging-ios.rst
@@ -35,7 +35,7 @@ those dependencies::
     brew install autoconf automake libtool pkg-config
     brew link libtool
     sudo easy_install pip
-    sudo pip install cython==0.21.2
+    sudo pip install cython==0.23
 
 For more detail, see :ref:`IOS Prerequisites <packaging_ios_prerequisites>`.
 Just ensure that everything is ok before starting the second step!