diff --git a/Cargo.lock b/Cargo.lock
index faf0c32..0b21f4c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -287,9 +287,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.5.4"
+version = "4.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bc066a67923782aa8515dbaea16946c5bcc5addbd668bb80af688e53e548a0"
+checksum = "a9689a29b593160de5bc4aacab7b5d54fb52231de70122626c178e6a368994c7"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -297,9 +297,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.5.2"
+version = "4.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae129e2e766ae0ec03484e609954119f123cc1fe650337e155d03b022f24f7b4"
+checksum = "2e5387378c84f6faa26890ebf9f0a92989f8873d4d380467bcd0d8d8620424df"
 dependencies = [
  "anstream",
  "anstyle",
@@ -309,9 +309,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "4.5.4"
+version = "4.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "528131438037fd55894f62d6e9f068b8f45ac57ffa77517819645d10aed04f64"
+checksum = "c780290ccf4fb26629baa7a1081e68ced113f1d3ec302fa5948f1c381ebf06c6"
 dependencies = [
  "heck 0.5.0",
  "proc-macro2",
diff --git a/Cargo.toml b/Cargo.toml
index 5888fa2..9537ec3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-clap = { version = "4.5.4", features = ["derive"] }
+clap = { version = "4.5.6", features = ["derive"] }
 libc = "0.2"
 milter = "0.2"
 mxdns = "0.4"