diff --git a/src/packet/mod.rs b/src/packet/mod.rs
index 44851d5..76e2816 100644
--- a/src/packet/mod.rs
+++ b/src/packet/mod.rs
@@ -13,7 +13,7 @@ pub use packet::{Packet, StandardPacket};
 mod ping;
 pub use ping::Ping;
 
-pub trait Cryptographer {
+pub trait Cryptographer: Send + Sync {
     fn decrypt(&self, to_decrypt: Vec<u8>) -> Vec<u8>;
     fn encrypt(&self, to_encrypt: Vec<u8>) -> Vec<u8>;
     fn secret(&self) -> &'_ [u8];