diff --git a/INSTALL.rst b/INSTALL.rst
index 466fd5d16f8d095c93db3d41b158530d25f4049f..882e8e1661c5657b2a794460b82f1b770be83bfd 100644
--- a/INSTALL.rst
+++ b/INSTALL.rst
@@ -50,7 +50,7 @@ The following software is highly recommended though not strictly required:
    footprint.  (Kwant uses only the sequential, single core version
    of MUMPS.  The advantages due to MUMPS as used by Kwant are thus independent
    of the number of CPU cores of the machine on which Kwant runs.)
- * The `py.test testing framework <http://pytest.org/>`_ for running the
+ * The `py.test testing framework <http://pytest.org/>`_ 2.8 or newer for running the
    tests included with Kwant.
 
 In addition, to build a copy of Kwant that has been checked-out directly from