diff --git a/impl/Cargo.toml b/impl/Cargo.toml
index b3fa424..726d65a 100644
--- a/impl/Cargo.toml
+++ b/impl/Cargo.toml
@@ -18,4 +18,4 @@ unstable = ["proc-macro2/nightly"]
 [dependencies]
 proc-macro2 = "1.0"
 quote = "1.0"
-syn = { version = "1.0", default-features = false, features = ["parsing", "printing", "proc-macro"] }
+syn = { version = "2.0", default-features = false, features = ["parsing", "printing", "proc-macro"] }