diff --git a/README.md b/README.md
index 9c584f0d..4669d6b8 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Switch OC Suite
 
-Overclocking suite for Switch **(Mariko Only)** running on Atmosphere CFW. Support Horizon OS 13.0.0.
+Overclocking suite for Switch **(Mariko Only)** running on Atmosphere CFW. Support Horizon OS 12.1.0.