diff --git a/README.md b/README.md
index 3ecf961..39a4cae 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 [![](https://img.shields.io/badge/Lean-Zulip-green)](https://leanprover.zulipchat.com)
 [![](https://img.shields.io/badge/TODO-List-green)](https://heplean.github.io/HepLean/TODOList)
 [![](https://img.shields.io/badge/Informal_dependencies-Graph-green)](https://heplean.github.io/HepLean/InformalGraph)
-[![](https://img.shields.io/badge/Lean-v4.12.0-blue)](https://github.com/leanprover/lean4/releases/tag/v4.12.0)
+[![](https://img.shields.io/badge/Lean-v4.13.0-blue)](https://github.com/leanprover/lean4/releases/tag/v4.13.0)
 [![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/HEPLean/HepLean)
 
 A project to digitalize high energy physics.