diff --git a/macros/Cargo.toml b/macros/Cargo.toml
index ed4a99e..dc42696 100644
--- a/macros/Cargo.toml
+++ b/macros/Cargo.toml
@@ -14,4 +14,4 @@ proc-macro = true
 
 [dependencies]
 quote = "1.0.3"
-syn = { version = "^1", features = ["full"] }
+syn = { version = "2", features = ["full"] }