diff --git a/src/uu/factor/Cargo.toml b/src/uu/factor/Cargo.toml
index 218918762..ad0f05233 100644
--- a/src/uu/factor/Cargo.toml
+++ b/src/uu/factor/Cargo.toml
@@ -15,7 +15,7 @@ edition = "2021"
 num-traits = "0.2.15" # used in src/numerics.rs, which is included by build.rs
 
 [dependencies]
-clap = { version = "3.2", features = ["wrap_help", "cargo"] }
+clap = { version = "4.0", features = ["wrap_help", "cargo"] }
 coz = { version = "0.1.3", optional = true }
 num-traits = "0.2.15" # Needs at least version 0.2.15 for "OverflowingAdd"
 rand = { version = "0.8", features = ["small_rng"] }
diff --git a/src/uu/factor/src/cli.rs b/src/uu/factor/src/cli.rs
index 3c345ab48..1bf764ca6 100644
--- a/src/uu/factor/src/cli.rs
+++ b/src/uu/factor/src/cli.rs
@@ -15,7 +15,7 @@ use std::io::BufRead;
 use std::io::{self, stdin, stdout, Write};
 
 mod factor;
-use clap::{crate_version, Arg, Command};
+use clap::{crate_version, Arg, ArgAction, Command};
 pub use factor::*;
 use uucore::display::Quotable;
 use uucore::error::UResult;
@@ -78,10 +78,10 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     Ok(())
 }
 
-pub fn uu_app<'a>() -> Command<'a> {
+pub fn uu_app() -> Command {
     Command::new(uucore::util_name())
         .version(crate_version!())
         .about(ABOUT)
         .infer_long_args(true)
-        .arg(Arg::new(options::NUMBER).multiple_occurrences(true))
+        .arg(Arg::new(options::NUMBER).action(ArgAction::Append))
 }
diff --git a/tests/by-util/test_factor.rs b/tests/by-util/test_factor.rs
index 5978b553f..92abf5b79 100644
--- a/tests/by-util/test_factor.rs
+++ b/tests/by-util/test_factor.rs
@@ -8,10 +8,8 @@
 
 // spell-checker:ignore (methods) hexdigest
 
-use tempfile::TempDir;
-
 use crate::common::util::*;
-use std::fs::OpenOptions;
+
 use std::time::SystemTime;
 
 #[path = "../../src/uu/factor/sieve.rs"]
@@ -33,9 +31,12 @@ fn test_invalid_arg() {
 }
 
 #[test]
+#[cfg(feature = "sort")]
 fn test_parallel() {
     use hex_literal::hex;
     use sha1::{Digest, Sha1};
+    use std::fs::OpenOptions;
+    use tempfile::TempDir;
     // factor should only flush the buffer at line breaks
     let n_integers = 100_000;
     let mut input_string = String::new();