diff --git a/README.rst b/README.rst
index 6aab837..3df5e75 100755
--- a/README.rst
+++ b/README.rst
@@ -40,7 +40,7 @@ See `ConstantBackoff`_ for an implementation reference.
 Installation
 ------------
 
-Using ``pip`` package manager (requires pip 1.8+. Upgrade it running: ``pip install -U pip``):
+Using ``pip`` package manager (requires pip 1.9+. Upgrade it running: ``pip install -U pip``):
 
 .. code-block:: bash