diff --git a/Cargo.toml b/Cargo.toml
index 8115134..56131ab 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -49,7 +49,7 @@ rustls = { version = "0.21", features = ["dangerous_configuration"], optional =
 rustls-pemfile = { version = "1", optional = true }
 rustls-native-certs = { version = "0.6.2", optional = true }
 webpki-roots = { version = "0.25", optional = true }
-boring = { version = "3", optional = true }
+boring = { version = "4", optional = true }
 
 # async
 futures-io = { version = "0.3.7", optional = true }
@@ -65,7 +65,7 @@ futures-rustls = { version = "0.24", optional = true }
 tokio1_crate = { package = "tokio", version = "1", optional = true }
 tokio1_native_tls_crate = { package = "tokio-native-tls", version = "0.3", optional = true }
 tokio1_rustls = { package = "tokio-rustls", version = "0.24", optional = true }
-tokio1_boring = { package = "tokio-boring", version = "3", optional = true }
+tokio1_boring = { package = "tokio-boring", version = "4", optional = true }
 
 ## dkim
 sha2 = { version = "0.10", optional = true, features = ["oid"] }