diff --git a/Cargo.lock b/Cargo.lock
index 0faee2f5..34568e5a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -222,15 +222,6 @@ dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "ansi_term"
-version = "0.12.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
-dependencies = [
- "winapi",
-]
-
 [[package]]
 name = "anyhow"
 version = "1.0.52"
@@ -449,17 +440,17 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "2.34.0"
+version = "3.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a0610544180c38b88101fecf2dd634b174a62eef6946f84dfc6a7127512b381c"
+checksum = "d17bf219fcd37199b9a29e00ba65dfb8cd5b2688b7297ec14ff829c40ac50ca9"
 dependencies = [
- "ansi_term",
  "atty",
  "bitflags",
- "strsim 0.8.0",
+ "indexmap",
+ "os_str_bytes",
+ "strsim",
+ "termcolor",
  "textwrap",
- "unicode-width",
- "vec_map",
 ]
 
 [[package]]
@@ -587,7 +578,7 @@ dependencies = [
  "ident_case",
  "proc-macro2",
  "quote",
- "strsim 0.10.0",
+ "strsim",
  "syn",
 ]
 
@@ -1426,6 +1417,15 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "os_str_bytes"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e22443d1643a904602595ba1cd8f7d896afe56d26712531c5ff73a15b2fbf64"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "parking_lot"
 version = "0.11.2"
@@ -2095,12 +2095,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "strsim"
-version = "0.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
-
 [[package]]
 name = "strsim"
 version = "0.10.0"
@@ -2182,12 +2176,9 @@ dependencies = [
 
 [[package]]
 name = "textwrap"
-version = "0.11.0"
+version = "0.14.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
-dependencies = [
- "unicode-width",
-]
+checksum = "0066c8d12af8b5acd21e00547c3797fde4e8677254a7ee429176ccebbe93dd80"
 
 [[package]]
 name = "thiserror"
@@ -2449,12 +2440,6 @@ dependencies = [
  "tinyvec",
 ]
 
-[[package]]
-name = "unicode-width"
-version = "0.1.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3ed742d4ea2bd1176e236172c8429aaf54486e7ac098db29ffe6529e0ce50973"
-
 [[package]]
 name = "unicode-xid"
 version = "0.2.2"
@@ -2489,12 +2474,6 @@ version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
 
-[[package]]
-name = "vec_map"
-version = "0.8.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
-
 [[package]]
 name = "vergen"
 version = "6.0.0"
diff --git a/Cargo.toml b/Cargo.toml
index 678defbe..3365cf2f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,7 +27,7 @@ anyhow = "1.0.52"
 actix-web = "4.0.0-beta.18"
 async-trait = "0.1.52"
 bytes = "1.1.0"
-clap = "2.34.0"
+clap = "3.0.0"
 cloudflare = "0.9.0"
 domain = { version = "0.6.1", features = ["master"] }
 env_logger = "0.9.0"
diff --git a/src/main.rs b/src/main.rs
index 78bf6a98..3df0eda9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -51,8 +51,8 @@ async fn main() -> std::io::Result<()> {
         .author(env!("CARGO_PKG_AUTHORS"))
         .about(env!("CARGO_PKG_DESCRIPTION"))
         .arg(
-            Arg::with_name("config")
-                .short("c")
+            Arg::new("config")
+                .short('c')
                 .long("config")
                 .value_name("FILE")
                 .default_value("./config.toml")
@@ -60,22 +60,22 @@ async fn main() -> std::io::Result<()> {
                 .takes_value(true),
         )
         .arg(
-            Arg::with_name("debug")
+            Arg::new("debug")
                 .long("debug")
-                .short("d")
+                .short('d')
                 .help("print debug information verbosely"),
         )
-        .subcommand(clap::SubCommand::with_name("srv").about("start server"))
+        .subcommand(clap::App::new("srv").about("start server"))
         .subcommand(
-            clap::SubCommand::with_name("add")
+            clap::App::new("add")
                 .about("add kuso subdomain")
-                .arg(Arg::with_name("subdomain").required(true).help("subdomain"))
-                .arg(Arg::with_name("target").required(true).help("target URL")),
+                .arg(Arg::new("subdomain").required(true).help("subdomain"))
+                .arg(Arg::new("target").required(true).help("target URL")),
         )
         .subcommand(
-            clap::SubCommand::with_name("delete")
+            clap::App::new("delete")
                 .about("delete kuso subdomain")
-                .arg(Arg::with_name("subdomain").required(true).help("subdomain")),
+                .arg(Arg::new("subdomain").required(true).help("subdomain")),
         )
         .get_matches();