diff --git a/src/reprc_proc_macro/Cargo.toml b/src/reprc_proc_macro/Cargo.toml
index fc33c9e..e871264 100644
--- a/src/reprc_proc_macro/Cargo.toml
+++ b/src/reprc_proc_macro/Cargo.toml
@@ -9,5 +9,5 @@ proc-macro = true
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-syn = { version = "1.0.109", features = ["full", "fold"] }
+syn = { version = "2.0.4", features = ["full", "fold"] }
 quote = "1.0.26"
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