diff --git a/Cargo.toml b/Cargo.toml
index 7818647..9efc73c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,6 +26,7 @@ exclude = [
     "**/docs/**",
     "**/doc/**",
 ]
+rust-version = "1.63"
 
 [dependencies]
 rosrust_msg = { version = "0.1", optional = true }