diff --git a/README.md b/README.md
index 1c05e25..0cf828c 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Sub-Address KEy (SAKE) filter
 
 [![Build Status](https://github.com/breard-r/opensmtpd-filter-sake/actions/workflows/ci.yml/badge.svg)](https://github.com/breard-r/opensmtpd-filter-sake/actions/workflows/ci.yml)
-![Minimum rustc version](https://img.shields.io/badge/rustc-1.64.0+-lightgray.svg)
+![Minimal rustc version](https://img.shields.io/badge/rustc-1.70.0+-lightgray.svg)
 ![License MIT OR Apache 2.0](https://img.shields.io/badge/license-MIT%20OR%20Apache--2.0-blue)
 
 Sub-address key filter for OpenSMTPD.