diff --git a/Cargo.lock b/Cargo.lock
index 1749027..e756a52 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -35,7 +35,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "serde",
- "syn 2.0.119",
+ "syn 3.0.9",
  "trybuild",
 ]
 
diff --git a/crates/agentspaces-derive/Cargo.toml b/crates/agentspaces-derive/Cargo.toml
index f65a96e..259f60a 100644
--- a/crates/agentspaces-derive/Cargo.toml
+++ b/crates/agentspaces-derive/Cargo.toml
@@ -33,7 +33,7 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1"
 quote = "1"
-syn = { version = "2", default-features = false, features = ["derive", "parsing", "printing", "proc-macro"] }
+syn = { version = "3", default-features = false, features = ["derive", "parsing", "printing", "proc-macro"] }
 
 [lints]
 workspace = true