diff --git a/derive/Cargo.toml b/derive/Cargo.toml
index 2b73b0d..9677f5d 100644
--- a/derive/Cargo.toml
+++ b/derive/Cargo.toml
@@ -12,4 +12,4 @@ proc_macro = true
 proc-macro2 = "1.0.47"
 pulldown-cmark = "0.9.2"
 quote = "1.0.21"
-syn = { version = "2.0.18 ", features = ["full"] }
+syn = { version = "2.0.39", features = ["full"] }