diff --git a/Cargo.toml b/Cargo.toml
index 6f9bf52..2deead4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,6 +20,7 @@ unicode-segmentation = "^1.6.0"
 unicode-normalization = "^0.1"
 smallvec = "1.10.0"
 ahash = "0.8.3"
+syn = "2.0.37"
 
 [dev-dependencies]
 csv = "1.1"