diff --git a/Cargo.toml b/Cargo.toml
index d1dce10f..c1066e4d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,6 +32,7 @@ c2a-uart-kble = { path = "./hal/uart-kble" }
 name = "c2a-core"
 version.workspace = true
 edition = "2021"
+rust-version = "1.78.0"
 
 description = "Core of Command Centric Architecture"
 readme = "README.md"