diff --git a/README.md b/README.md
index b4c1d2aa..4d07e9ea 100644
--- a/README.md
+++ b/README.md
@@ -70,7 +70,7 @@ Python codes for robotics algorithm.
 
 - pandas
 
-- [cvxpy](https://cvxgrp.github.io/cvxpy/index.html) 
+- [cvxpy 0.4.x](https://cvxgrp.github.io/cvxpy/index.html) 
 
 # How to use