diff --git a/Cargo.toml b/Cargo.toml
index 4047dd0..b3d545f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,7 @@ edition = "2021"
 
 [dependencies.ring-buffer]
 git = "https://gitea.doryan04.ru/doryan/ring-buffer"
+optional = true
 
 [dependencies.arduino-hal]
 git = "https://github.com/rahix/avr-hal"