diff --git a/num_enum_derive/Cargo.toml b/num_enum_derive/Cargo.toml
index 7871e86..00cfd38 100644
--- a/num_enum_derive/Cargo.toml
+++ b/num_enum_derive/Cargo.toml
@@ -35,7 +35,7 @@ features = ["external_doc"]
 proc-macro2 = "1.0.60"
 proc-macro-crate = { version = ">= 1, <= 3", optional = true }
 quote = "1"
-syn = { version = "2", features = ["derive", "extra-traits", "parsing"] }
+syn = { version = "3", features = ["derive", "extra-traits", "parsing"] }
 
 [dev-dependencies]
-syn = { version = "2", features = ["extra-traits", "parsing"] }
+syn = { version = "3", features = ["extra-traits", "parsing"] }