diff --git a/b/Cargo.lock b/b/Cargo.lock
index dd1f6a56..91971ab4 100644
--- a/b/Cargo.lock
+++ b/b/Cargo.lock
@@ -34,15 +34,6 @@ dependencies = [
  "libc",
 ]
 
-[[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 = "1.0.69"
@@ -69,17 +60,6 @@ dependencies = [
  "wait-timeout",
 ]
 
-[[package]]
-name = "atty"
-version = "0.2.14"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
-dependencies = [
- "hermit-abi",
- "libc",
- "winapi",
-]
-
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@@ -93,13 +73,14 @@ dependencies = [
  "adapter_fs",
  "anyhow",
  "assert_cmd",
+ "clap",
+ "clap_complete",
  "entity",
  "limited-date-time",
  "nom 6.2.1",
  "predicates 1.0.8",
  "serde",
  "serde_json",
- "structopt",
  "tempfile",
  "thiserror",
  "use_case",
@@ -170,17 +151,48 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "2.34.0"
+version = "4.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a0610544180c38b88101fecf2dd634b174a62eef6946f84dfc6a7127512b381c"
+checksum = "c3d7ae14b20b94cb02149ed21a86c423859cbe18dc7ed69845cace50e52b40a5"
 dependencies = [
- "ansi_term",
- "atty",
  "bitflags",
+ "clap_derive",
+ "clap_lex",
+ "is-terminal",
+ "once_cell",
  "strsim",
- "textwrap",
- "unicode-width",
- "vec_map",
+ "termcolor",
+]
+
+[[package]]
+name = "clap_complete"
+version = "4.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "501ff0a401473ea1d4c3b125ff95506b62c5bc5768d818634195fbb7c4ad5ff4"
+dependencies = [
+ "clap",
+]
+
+[[package]]
+name = "clap_derive"
+version = "4.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44bec8e5c9d09e439c4335b1af0abaab56dcf3b94999a936e1bb47b9134288f0"
+dependencies = [
+ "heck",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "clap_lex"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "350b9cf31731f9957399229e9b2adc51eeabdfbe9d71d9a0552275fd12710d09"
+dependencies = [
+ "os_str_bytes",
 ]
 
 [[package]]
@@ -354,21 +366,15 @@ dependencies = [
 
 [[package]]
 name = "heck"
-version = "0.3.3"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d621efb26863f0e9924c6ac577e8275e5e6b77455db64ffa6c65c904e9e132c"
-dependencies = [
- "unicode-segmentation",
-]
+checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.19"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
-dependencies = [
- "libc",
-]
+checksum = "fed44880c466736ef9a5c5b5facefb5ed0785676d0c02d612db14e54f0d84286"
 
 [[package]]
 name = "iana-time-zone"
@@ -413,6 +419,18 @@ dependencies = [
  "windows-sys 0.45.0",
 ]
 
+[[package]]
+name = "is-terminal"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21b6b32576413a8e69b90e952e4a026476040d81017b80445deda5f2d3921857"
+dependencies = [
+ "hermit-abi",
+ "io-lifetimes",
+ "rustix",
+ "windows-sys 0.45.0",
+]
+
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -561,6 +579,12 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
+[[package]]
+name = "os_str_bytes"
+version = "6.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b7820b9daea5457c9f21c69448905d723fbd21136ccf521748f23fd49e723ee"
+
 [[package]]
 name = "predicates"
 version = "1.0.8"
@@ -767,33 +791,9 @@ checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 
 [[package]]
 name = "strsim"
-version = "0.8.0"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
-
-[[package]]
-name = "structopt"
-version = "0.3.26"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c6b5c64445ba8094a6ab0c3cd2ad323e07171012d9c98b0b15651daf1787a10"
-dependencies = [
- "clap",
- "lazy_static",
- "structopt-derive",
-]
-
-[[package]]
-name = "structopt-derive"
-version = "0.4.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcb5ae327f9cc13b68763b5749770cb9e048a99bd9dfdfa58d0cf05d5f64afe0"
-dependencies = [
- "heck",
- "proc-macro-error",
- "proc-macro2",
- "quote",
- "syn",
-]
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
 name = "syn"
@@ -840,15 +840,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "95059e91184749cb66be6dc994f67f182b6d897cb3df74a5bf66b5e709295fd8"
 
-[[package]]
-name = "textwrap"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
-dependencies = [
- "unicode-width",
-]
-
 [[package]]
 name = "thiserror"
 version = "1.0.39"
@@ -886,12 +877,6 @@ version = "1.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e5464a87b239f13a63a501f2701565754bae92d243d4bb7eb12f6d57d2269bf4"
 
-[[package]]
-name = "unicode-segmentation"
-version = "1.10.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1dd624098567895118886609431a7c3b8f516e41d30e0643f03d94592a147e36"
-
 [[package]]
 name = "unicode-width"
 version = "0.1.10"
@@ -907,12 +892,6 @@ dependencies = [
  "nom 7.1.3",
 ]
 
-[[package]]
-name = "vec_map"
-version = "0.8.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
-
 [[package]]
 name = "version_check"
 version = "0.9.4"
diff --git a/b/crates/application/Cargo.toml b/b/crates/application/Cargo.toml
index 036b2de5..87d02a6a 100644
--- a/b/crates/application/Cargo.toml
+++ b/b/crates/application/Cargo.toml
@@ -9,12 +9,13 @@ edition = "2018"
 [dependencies]
 adapter_fs = { path = "../adapter_fs" }
 anyhow = "1.0.41"
+clap = { version = "4.1.8", features = ["derive"] }
+clap_complete = "4.1.4"
 entity = { path = "../entity" }
 limited-date-time = { git = "https://github.com/bouzuya/rust-limited-date-time", tag = "0.15.0" }
 nom = "6.1.2"
 serde = { version = "1.0.126", features = ["derive"] }
 serde_json = "1.0.64"
-structopt = "0.3.21"
 thiserror = "1.0.24"
 use_case = { path = "../use_case" }
 xdg = "2.4.0"
diff --git a/b/crates/application/src/main.rs b/b/crates/application/src/main.rs
index b2b55499..ed9c253f 100644
--- a/b/crates/application/src/main.rs
+++ b/b/crates/application/src/main.rs
@@ -2,46 +2,44 @@ mod command;
 mod config;
 
 use adapter_fs::FsBRepository;
+use clap_complete::{generate, Shell};
 use config::{Config, ConfigRepository};
 use entity::BId;
 use limited_date_time::TimeZoneOffset;
 use std::{io, path::PathBuf, str::FromStr};
-use structopt::{clap::Shell, StructOpt};
 use use_case::{HasBRepository, HasListUseCase, HasViewUseCase};
 
-#[derive(Debug, StructOpt)]
+#[derive(Debug, clap::Parser)]
 struct Opt {
-    #[structopt(subcommand)]
+    #[command(subcommand)]
     subcommand: Subcommand,
 }
 
-#[derive(Debug, StructOpt)]
+#[derive(Debug, clap::Subcommand)]
 enum Subcommand {
-    #[structopt(name = "completion", about = "Prints the shell's completion script")]
+    /// Prints the shell's completion script
     Completion {
-        #[structopt(name = "SHELL", help = "the shell", possible_values = &Shell::variants())]
+        #[arg(name = "SHELL", help = "the shell", value_enum)]
         shell: Shell,
     },
-    #[structopt(name = "list", about = "Lists b files")]
+    /// Lists b files
     List {
-        #[structopt(long = "json")]
+        #[arg(long)]
         json: bool,
         query: String,
     },
-    #[structopt(name = "new", about = "Creates a new file")]
+    /// Creates a new file
     New {
-        #[structopt(short = "d", long = "data-file", help = "The data file")]
+        /// The data file
+        #[arg(short, long)]
         data_file: PathBuf,
-        #[structopt(
-            short = "t",
-            long = "template",
-            help = "The template file or directory"
-        )]
+        /// The template file or directory
+        #[arg(short, long)]
         template: PathBuf,
     },
-    #[structopt(name = "view", about = "Views the b file")]
+    /// Views the b file
     View {
-        #[structopt(name = "BID")]
+        #[arg(name = "BID")]
         id: BId,
     },
 }
@@ -84,10 +82,11 @@ fn build_app(config: Config) -> anyhow::Result<App> {
 }
 
 fn main() -> anyhow::Result<()> {
-    let opt = Opt::from_args();
+    let opt = <Opt as clap::Parser>::parse();
     match opt.subcommand {
         Subcommand::Completion { shell } => {
-            Opt::clap().gen_completions_to("b", shell, &mut io::stdout());
+            let mut command = <Opt as clap::CommandFactory>::command();
+            generate(shell, &mut command, "b", &mut io::stdout());
             Ok(())
         }
         Subcommand::List { json, query } => {