diff --git a/Cargo.lock b/Cargo.lock
index dbeeb5a70..2d8deacf2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -230,9 +230,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.0.32"
+version = "4.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a7db700bc935f9e43e88d00b0850dae18a63773cfbec6d8e070fccf7fef89a39"
+checksum = "9a9d6ada83c1edcce028902ea27dd929069c70df4c7600b131b4d9a1ad2879cc"
 dependencies = [
  "bitflags",
  "clap_derive",
@@ -245,18 +245,18 @@ dependencies = [
 
 [[package]]
 name = "clap_complete"
-version = "4.0.7"
+version = "4.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "10861370d2ba66b0f5989f83ebf35db6421713fd92351790e7fdd6c36774c56b"
+checksum = "37686beaba5ac9f3ab01ee3172f792fc6ffdd685bfb9e63cfef02c0571a4e8e1"
 dependencies = [
- "clap 4.0.32",
+ "clap 4.1.9",
 ]
 
 [[package]]
 name = "clap_derive"
-version = "4.0.21"
+version = "4.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0177313f9f02afc995627906bbd8967e2be069f5261954222dac78290c2b9014"
+checksum = "fddf67631444a3a3e3e5ac51c36a5e01335302de677bd78759eaa90ab1f46644"
 dependencies = [
  "heck",
  "proc-macro-error",
@@ -285,11 +285,11 @@ dependencies = [
 
 [[package]]
 name = "clap_mangen"
-version = "0.2.6"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "904eb24d05ad587557e0f484ddce5c737c30cf81372badb16d13e41c4b8340b1"
+checksum = "4237e29de9c6949982ba87d51709204504fb8ed2fd38232fcb1e5bf7d4ba48c8"
 dependencies = [
- "clap 4.0.32",
+ "clap 4.1.9",
  "roff",
 ]
 
@@ -799,7 +799,7 @@ dependencies = [
  "assert_cmd",
  "assert_matches",
  "chrono",
- "clap 4.0.32",
+ "clap 4.1.9",
  "clap_complete",
  "clap_mangen",
  "config",
diff --git a/Cargo.toml b/Cargo.toml
index ca7a344c0..bdb926548 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -35,9 +35,9 @@ members = ["lib", "lib/testutils", "lib/gen-protos"]
 
 [dependencies]
 chrono = { version = "0.4.24", default-features = false, features = ["std", "clock"] }
-clap = { version = "4.0.32", features = ["derive", "deprecated"] }
-clap_complete = "4.0.7"
-clap_mangen = "0.2.6"
+clap = { version = "4.1.9", features = ["derive", "deprecated"] }
+clap_complete = "4.1.5"
+clap_mangen = "0.2.10"
 config = { version = "0.13.3", default-features = false, features = ["toml"] }
 crossterm = { version = "0.26", default-features = false }
 dirs = "4.0.0"
diff --git a/README.md b/README.md
index aaeb78fe1..6f90b3deb 100644
--- a/README.md
+++ b/README.md
@@ -266,8 +266,7 @@ source <(jj support completion)  # --bash is the default
 ```shell script
 autoload -U compinit
 compinit
-source <(jj support completion --zsh | sed '$d')  # remove the last line
-compdef _jj jj
+source <(jj support completion --zsh)
 ```
 
 ### Fish
diff --git a/tests/test_alias.rs b/tests/test_alias.rs
index 55a170090..0672b7069 100644
--- a/tests/test_alias.rs
+++ b/tests/test_alias.rs
@@ -67,11 +67,11 @@ fn test_alias_bad_name() {
 
     let stderr = test_env.jj_cmd_cli_error(&repo_path, &["foo."]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The subcommand 'foo.' wasn't recognized
+    error: unrecognized subcommand 'foo.'
 
     Usage: jj [OPTIONS] <COMMAND>
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 }
 
@@ -84,11 +84,11 @@ fn test_alias_calls_unknown_command() {
     test_env.add_config(r#"aliases.foo = ["nonexistent"]"#);
     let stderr = test_env.jj_cmd_cli_error(&repo_path, &["foo"]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The subcommand 'nonexistent' wasn't recognized
+    error: unrecognized subcommand 'nonexistent'
 
     Usage: jj [OPTIONS] <COMMAND>
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 }
 
@@ -101,13 +101,13 @@ fn test_alias_calls_command_with_invalid_option() {
     test_env.add_config(r#"aliases.foo = ["log", "--nonexistent"]"#);
     let stderr = test_env.jj_cmd_cli_error(&repo_path, &["foo"]);
     insta::assert_snapshot!(stderr, @r###"
-    error: Found argument '--nonexistent' which wasn't expected, or isn't valid in this context
+    error: unexpected argument '--nonexistent' found
 
-      If you tried to supply '--nonexistent' as a value rather than a flag, use '-- --nonexistent'
+      note: to pass '--nonexistent' as a value, use '-- --nonexistent'
 
     Usage: jj log [OPTIONS] [PATHS]...
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 }
 
diff --git a/tests/test_branch_command.rs b/tests/test_branch_command.rs
index df96a1ee2..067b28f31 100644
--- a/tests/test_branch_command.rs
+++ b/tests/test_branch_command.rs
@@ -53,9 +53,9 @@ fn test_branch_empty_name() {
 
     let stderr = test_env.jj_cmd_cli_error(&repo_path, &["branch", "create", ""]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The argument '<NAMES>...' requires a value but none was supplied
+    error: a value is required for '<NAMES>...' but none was supplied
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 }
 #[test]
diff --git a/tests/test_config_command.rs b/tests/test_config_command.rs
index 9499a5254..78e7a38b5 100644
--- a/tests/test_config_command.rs
+++ b/tests/test_config_command.rs
@@ -270,14 +270,14 @@ fn test_config_set_missing_opts() {
     let test_env = TestEnvironment::default();
     let stderr = test_env.jj_cmd_cli_error(test_env.env_root(), &["config", "set"]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The following required arguments were not provided:
+    error: the following required arguments were not provided:
       <--user|--repo>
       <NAME>
       <VALUE>
 
     Usage: jj config set <--user|--repo> <NAME> <VALUE>
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 }
 
@@ -387,12 +387,12 @@ fn test_config_edit_missing_opt() {
     let test_env = TestEnvironment::default();
     let stderr = test_env.jj_cmd_cli_error(test_env.env_root(), &["config", "edit"]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The following required arguments were not provided:
+    error: the following required arguments were not provided:
       <--user|--repo>
 
     Usage: jj config edit <--user|--repo>
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 }
 
diff --git a/tests/test_diff_command.rs b/tests/test_diff_command.rs
index 408b0ee9d..23d6540ce 100644
--- a/tests/test_diff_command.rs
+++ b/tests/test_diff_command.rs
@@ -186,20 +186,20 @@ fn test_diff_bad_args() {
 
     let stderr = test_env.jj_cmd_cli_error(&repo_path, &["diff", "-s", "--types"]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The argument '--summary' cannot be used with '--types'
+    error: the argument '--summary' cannot be used with '--types'
 
     Usage: jj diff --summary [PATHS]...
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 
     let stderr = test_env.jj_cmd_cli_error(&repo_path, &["diff", "--color-words", "--git"]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The argument '--color-words' cannot be used with '--git'
+    error: the argument '--color-words' cannot be used with '--git'
 
     Usage: jj diff --color-words [PATHS]...
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 }
 
diff --git a/tests/test_edit_command.rs b/tests/test_edit_command.rs
index 6c5e837f7..2c38142fc 100644
--- a/tests/test_edit_command.rs
+++ b/tests/test_edit_command.rs
@@ -31,12 +31,12 @@ fn test_edit() {
     // Errors out without argument
     let stderr = test_env.jj_cmd_cli_error(&repo_path, &["edit"]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The following required arguments were not provided:
+    error: the following required arguments were not provided:
       <REVISION>
 
     Usage: jj edit <REVISION>
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 
     // Makes the specified commit the working-copy commit
diff --git a/tests/test_global_opts.rs b/tests/test_global_opts.rs
index d51d7f1a9..f96b26604 100644
--- a/tests/test_global_opts.rs
+++ b/tests/test_global_opts.rs
@@ -373,7 +373,7 @@ fn test_help() {
       -r, --revision <REVISION>  The revision to touch up. Defaults to @ if --to/--from are not specified
           --from <FROM>          Show changes from this revision. Defaults to @ if --to is specified
           --to <TO>              Edit changes in this revision. Defaults to @ if --from is specified
-      -h, --help                 Print help information (use `--help` for more detail)
+      -h, --help                 Print help (see more with '--help')
 
     Global Options:
       -R, --repository <REPOSITORY>      Path to repository to operate on
diff --git a/tests/test_log_command.rs b/tests/test_log_command.rs
index 7df8c8a5b..6a81cfb89 100644
--- a/tests/test_log_command.rs
+++ b/tests/test_log_command.rs
@@ -24,9 +24,9 @@ fn test_log_with_empty_revision() {
 
     let stderr = test_env.jj_cmd_cli_error(&repo_path, &["log", "-r="]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The argument '--revisions <REVISIONS>' requires a value but none was supplied
+    error: a value is required for '--revisions <REVISIONS>' but none was supplied
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 }
 
@@ -179,11 +179,11 @@ fn test_log_with_or_without_diff() {
         ],
     );
     insta::assert_snapshot!(stderr, @r###"
-    error: The argument '--git' cannot be used with '--color-words'
+    error: the argument '--git' cannot be used with '--color-words'
 
     Usage: jj log --template <TEMPLATE> --no-graph --patch --git [PATHS]...
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 
     // `-s` with or without graph
diff --git a/tests/test_move_command.rs b/tests/test_move_command.rs
index fce85db01..8d38602e2 100644
--- a/tests/test_move_command.rs
+++ b/tests/test_move_command.rs
@@ -70,12 +70,12 @@ fn test_move() {
     // Errors out without arguments
     let stderr = test_env.jj_cmd_cli_error(&repo_path, &["move"]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The following required arguments were not provided:
+    error: the following required arguments were not provided:
       <--from <FROM>|--to <TO>>
 
     Usage: jj move <--from <FROM>|--to <TO>> [PATHS]...
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
     // Errors out if source and destination are the same
     let stderr = test_env.jj_cmd_failure(&repo_path, &["move", "--to", "@"]);
diff --git a/tests/test_rebase_command.rs b/tests/test_rebase_command.rs
index 85bb548f3..d8e43ee79 100644
--- a/tests/test_rebase_command.rs
+++ b/tests/test_rebase_command.rs
@@ -42,34 +42,34 @@ fn test_rebase_invalid() {
     // Missing destination
     let stderr = test_env.jj_cmd_cli_error(&repo_path, &["rebase"]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The following required arguments were not provided:
+    error: the following required arguments were not provided:
       --destination <DESTINATION>
 
     Usage: jj rebase --destination <DESTINATION>
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 
     // Both -r and -s
     let stderr =
         test_env.jj_cmd_cli_error(&repo_path, &["rebase", "-r", "a", "-s", "a", "-d", "b"]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The argument '--revision <REVISION>' cannot be used with '--source <SOURCE>'
+    error: the argument '--revision <REVISION>' cannot be used with '--source <SOURCE>'
 
     Usage: jj rebase --destination <DESTINATION> --revision <REVISION>
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 
     // Both -b and -s
     let stderr =
         test_env.jj_cmd_cli_error(&repo_path, &["rebase", "-b", "a", "-s", "a", "-d", "b"]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The argument '--branch <BRANCH>' cannot be used with '--source <SOURCE>'
+    error: the argument '--branch <BRANCH>' cannot be used with '--source <SOURCE>'
 
     Usage: jj rebase --destination <DESTINATION> --branch <BRANCH>
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
 
     // Rebase onto descendant with -r
diff --git a/tests/test_untrack_command.rs b/tests/test_untrack_command.rs
index cb18a1ff8..2acf4678c 100644
--- a/tests/test_untrack_command.rs
+++ b/tests/test_untrack_command.rs
@@ -48,12 +48,12 @@ fn test_untrack() {
     // Errors out when no path is specified
     let stderr = test_env.jj_cmd_cli_error(&repo_path, &["untrack"]);
     insta::assert_snapshot!(stderr, @r###"
-    error: The following required arguments were not provided:
+    error: the following required arguments were not provided:
       <PATHS>...
 
     Usage: jj untrack <PATHS>...
 
-    For more information try '--help'
+    For more information, try '--help'.
     "###);
     // Errors out when a specified file is not ignored
     let stderr = test_env.jj_cmd_failure(&repo_path, &["untrack", "file1", "file1.bak"]);