diff --git a/crates/rmcp-macros/Cargo.toml b/crates/rmcp-macros/Cargo.toml
index 6f645bdc7..83a36a89b 100644
--- a/crates/rmcp-macros/Cargo.toml
+++ b/crates/rmcp-macros/Cargo.toml
@@ -15,7 +15,7 @@ documentation = "https://docs.rs/rmcp-macros"
 proc-macro = true
 
 [dependencies]
-syn = {version = "2", features = ["full"]}
+syn = {version = "3", features = ["full"]}
 quote = "1"
 proc-macro2 = "1"
 serde_json = "1.0"