diff --git a/Cargo.toml b/Cargo.toml
index 9cc8382..d11c649 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -63,8 +63,8 @@ tokio1_native_tls_crate = { package = "tokio-native-tls", version = "0.3", optio
 tokio1_rustls = { package = "tokio-rustls", version = "0.23", optional = true }
 
 ## dkim
-sha2 = { version = "0.9.8", optional = true }
-rsa = { version = "0.5.0", optional = true }
+sha2 = { version = "0.10", optional = true }
+rsa = { version = "0.6.0-pre", optional = true }
 ed25519-dalek = { version = "1.0.1", optional = true }
 
 [dev-dependencies]
diff --git a/src/message/dkim.rs b/src/message/dkim.rs
index 3cae12c..8807f6b 100644
--- a/src/message/dkim.rs
+++ b/src/message/dkim.rs
@@ -9,7 +9,7 @@ use std::{
 use ed25519_dalek::Signer;
 use once_cell::sync::Lazy;
 use regex::{bytes::Regex as BRegex, Regex};
-use rsa::{pkcs1::FromRsaPrivateKey, Hash, PaddingScheme, RsaPrivateKey};
+use rsa::{pkcs1::DecodeRsaPrivateKey, Hash, PaddingScheme, RsaPrivateKey};
 use sha2::{Digest, Sha256};
 
 use crate::message::{