diff --git a/README b/README
index f73e136..5410fd3 100644
--- a/README
+++ b/README
@@ -6,7 +6,7 @@ INSTALL
 calculate-api needs the following library version installed, in order to run:
     python >= 2.6
     soaplib = 1.0
-    calculate-lib >= 2.2.0.0
+    calculate-lib >= 3.0.0_beta2.0
 
 To install calculate-api, just execute the install script 'setup.py'.
 Example: