diff --git a/curve25519-dalek-derive/Cargo.toml b/curve25519-dalek-derive/Cargo.toml
index 11c875ebf..e19164c37 100644
--- a/curve25519-dalek-derive/Cargo.toml
+++ b/curve25519-dalek-derive/Cargo.toml
@@ -15,5 +15,5 @@ proc-macro = true
 
 [dependencies]
 proc-macro2 = "1.0.53"
-quote = "1.0.26"
-syn = { version = "2.0.8", features = ["full"] }
+quote = "1.0.29"
+syn = { version = "2.0.22", features = ["full"] }