diff --git a/validatron_derive/Cargo.toml b/validatron_derive/Cargo.toml
index 5f0b6a1..849dd69 100644
--- a/validatron_derive/Cargo.toml
+++ b/validatron_derive/Cargo.toml
@@ -18,4 +18,4 @@ proc_macro = true
 [dependencies]
 proc-macro2 = "1.0"
 quote = "1.0"
-syn = "1.0"
+syn = "2.0"