diff --git a/Cargo.toml b/Cargo.toml
index 0fa7e765a7..eb0cd769de 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ license-file = "LICENSE"
 glob = "0"
 quote = "1.0"
 proc-macro2 = "1.0"
-syn = "2.0"
+syn = "2.0.99"
 itertools = "0.13"
 serde_json = "1.0"
 prettyplease = "0.2"