diff --git a/submillisecond_macros/Cargo.toml b/submillisecond_macros/Cargo.toml
index 9985449..bb18950 100644
--- a/submillisecond_macros/Cargo.toml
+++ b/submillisecond_macros/Cargo.toml
@@ -17,7 +17,7 @@ proc-macro2 = "1.0"
 quote = "1.0"
 regex = "1.5.6"
 rust-format = { version = "0.3", features = ["token_stream"] }
-syn = { version = "1.0", features = ["derive", "extra-traits", "full"] }
+syn = { version = "2.0", features = ["derive", "extra-traits", "full"] }
 
 [package.metadata.docs.rs]
 targets = ["wasm32-wasi"]