diff --git a/src/uu/sum/Cargo.toml b/src/uu/sum/Cargo.toml
index a443bc781..7087d0023 100644
--- a/src/uu/sum/Cargo.toml
+++ b/src/uu/sum/Cargo.toml
@@ -15,7 +15,7 @@ edition = "2021"
 path = "src/sum.rs"
 
 [dependencies]
-clap = { version = "3.2", features = ["wrap_help", "cargo"] }
+clap = { version = "4.0", features = ["wrap_help", "cargo"] }
 uucore = { version=">=0.0.16", package="uucore", path="../../uucore" }
 
 [[bin]]
diff --git a/src/uu/sum/src/sum.rs b/src/uu/sum/src/sum.rs
index 825071aee..90717badf 100644
--- a/src/uu/sum/src/sum.rs
+++ b/src/uu/sum/src/sum.rs
@@ -10,7 +10,7 @@
 #[macro_use]
 extern crate uucore;
 
-use clap::{crate_version, Arg, Command};
+use clap::{crate_version, Arg, ArgAction, Command};
 use std::fs::File;
 use std::io::{stdin, Read};
 use std::path::Path;
@@ -118,7 +118,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         None => vec!["-".to_owned()],
     };
 
-    let sysv = matches.contains_id(options::SYSTEM_V_COMPATIBLE);
+    let sysv = matches.get_flag(options::SYSTEM_V_COMPATIBLE);
 
     let print_names = if sysv {
         files.len() > 1 || files[0] != "-"
@@ -149,7 +149,7 @@ 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())
         .name(NAME)
         .version(crate_version!())
@@ -158,19 +158,21 @@ pub fn uu_app<'a>() -> Command<'a> {
         .infer_long_args(true)
         .arg(
             Arg::new(options::FILE)
-                .multiple_occurrences(true)
+                .action(ArgAction::Append)
                 .hide(true)
                 .value_hint(clap::ValueHint::FilePath),
         )
         .arg(
             Arg::new(options::BSD_COMPATIBLE)
                 .short('r')
-                .help("use the BSD sum algorithm, use 1K blocks (default)"),
+                .help("use the BSD sum algorithm, use 1K blocks (default)")
+                .action(ArgAction::SetTrue),
         )
         .arg(
             Arg::new(options::SYSTEM_V_COMPATIBLE)
                 .short('s')
                 .long(options::SYSTEM_V_COMPATIBLE)
-                .help("use System V sum algorithm, use 512 bytes blocks"),
+                .help("use System V sum algorithm, use 512 bytes blocks")
+                .action(ArgAction::SetTrue),
         )
 }