diff --git a/README b/README
index fc4fa8e..f317f1a 100644
--- a/README
+++ b/README
@@ -4,7 +4,7 @@ INSTALL
 -------
 
 calculate-lib needs the following library version installed, in order to run:
-    python >= 2.5
+    python >= 2.7
     python-ldap >= 2.0.0
     pyxml >= 0.8
     py-smbpasswd >= 1.0