diff --git a/impl/Cargo.toml b/impl/Cargo.toml
index 38dcf97e..f34d96f6 100644
--- a/impl/Cargo.toml
+++ b/impl/Cargo.toml
@@ -24,7 +24,7 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1.0"
 quote = "1.0"
-syn = "1.0.81"
+syn = "2.0.4"
 convert_case = { version = "0.6", optional = true }
 unicode-xid = { version = "0.2.2", optional = true }