diff --git a/crates/rmcp-macros/Cargo.toml b/crates/rmcp-macros/Cargo.toml
index db94afc8c..2d71c87b0 100644
--- a/crates/rmcp-macros/Cargo.toml
+++ b/crates/rmcp-macros/Cargo.toml
@@ -16,7 +16,7 @@ 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"