diff --git a/README_en.md b/README_en.md
index 2a6ee43..80b3cb4 100644
--- a/README_en.md
+++ b/README_en.md
@@ -42,7 +42,7 @@ pip install Cython
 ```
 After that, you can install BytePiece via pip:
 ```bash
-pip install bytepiece==0.4.0
+pip install bytepiece==0.4.1
 ```
 
 ## Usage