diff --git a/Cargo.lock b/Cargo.lock
index 955626985..607f0d176 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -819,11 +819,8 @@ dependencies = [
 
 [[package]]
 name = "number_prefix"
-version = "0.2.8"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-traits 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "numtoa"
@@ -938,7 +935,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "quote"
-version = "1.0.7"
+version = "1.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1152,8 +1149,8 @@ version = "1.0.118"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.55 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1219,11 +1216,11 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.54"
+version = "1.0.55"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1517,7 +1514,7 @@ version = "0.0.1"
 dependencies = [
  "clap 2.33.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
- "number_prefix 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "number_prefix 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.4",
  "uucore_procs 0.0.4",
  "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1760,7 +1757,7 @@ dependencies = [
  "getopts 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "isatty 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "number_prefix 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "number_prefix 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "term_grid 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "termsize 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2357,8 +2354,8 @@ name = "uucore_procs"
 version = "0.0.4"
 dependencies = [
  "proc-macro2 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.55 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2404,8 +2401,8 @@ dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.55 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-shared 0.2.69 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2414,7 +2411,7 @@ name = "wasm-bindgen-macro"
 version = "0.2.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-macro-support 0.2.69 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2424,8 +2421,8 @@ version = "0.2.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.55 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-backend 0.2.69 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-shared 0.2.69 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2586,7 +2583,7 @@ dependencies = [
 "checksum num-integer 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)" = "d2cc698a63b549a70bc047073d2949cce27cd1c7b0a4a862d08a8031bc2801db"
 "checksum num-traits 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
 "checksum num_cpus 1.13.0 (registry+https://github.com/rust-lang/crates.io-index)" = "05499f3756671c15885fee9034446956fff3f243d6077b91e5767df161f766b3"
-"checksum number_prefix 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "dbf9993e59c894e3c08aa1c2712914e9e6bf1fcbfc6bef283e2183df345a4fee"
+"checksum number_prefix 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "830b246a0e5f20af87141b25c173cd1b609bd7779a4617d6ec582abaf90870f3"
 "checksum numtoa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b8f8bdf33df195859076e54ab11ee78a1b208382d3a26ec40d142ffc1ecc49ef"
 "checksum onig 4.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "8518fcb2b1b8c2f45f0ad499df4fda6087fc3475ca69a185c173b8315d2fb383"
 "checksum onig_sys 69.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388410bf5fa341f10e58e6db3975f4bea1ac30247dd79d37a9e5ced3cb4cc3b0"
@@ -2602,7 +2599,7 @@ dependencies = [
 "checksum quick-error 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
 "checksum quickcheck 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a44883e74aa97ad63db83c4bf8ca490f02b2fc02f92575e720c8551e843c945f"
 "checksum quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e920b65c65f10b2ae65c831a81a073a89edd28c7cce89475bff467ab4167a"
-"checksum quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)" = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
+"checksum quote 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)" = "991431c3519a3f36861882da93630ce66b52918dcf1b8e2fd66b397fc96f28df"
 "checksum rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c618c47cd3ebd209790115ab837de41425723956ad3ce2e6a7f09890947cacb9"
 "checksum rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
 "checksum rand_chacha 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
@@ -2637,7 +2634,7 @@ dependencies = [
 "checksum smallvec 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)" = "f7b0758c52e15a8b5e3691eae6cc559f08eee9406e548a4477ba4e67770a82b6"
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 "checksum syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d3b891b9015c88c576343b9b3e41c2c11a51c219ef067b264bd9c8aa9b441dad"
-"checksum syn 1.0.54 (registry+https://github.com/rust-lang/crates.io-index)" = "9a2af957a63d6bd42255c359c93d9bfdb97076bd3b820897ce55ffbfbf107f44"
+"checksum syn 1.0.55 (registry+https://github.com/rust-lang/crates.io-index)" = "a571a711dddd09019ccc628e1b17fe87c59b09d513c06c026877aa708334f37a"
 "checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
 "checksum synstructure 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3a761d12e6d8dcb4dcf952a7a89b475e3a9d69e4a69307e01a470977642914bd"
 "checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
diff --git a/src/uu/df/Cargo.toml b/src/uu/df/Cargo.toml
index 02ac86fdd..170adaa02 100644
--- a/src/uu/df/Cargo.toml
+++ b/src/uu/df/Cargo.toml
@@ -17,7 +17,7 @@ path = "src/df.rs"
 [dependencies]
 clap = "2.33"
 libc = "0.2"
-number_prefix = "0.2"
+number_prefix = "0.4"
 uucore = { version=">=0.0.4", package="uucore", path="../../uucore" }
 uucore_procs = { version=">=0.0.4", package="uucore_procs", path="../../uucore_procs" }
 
diff --git a/src/uu/df/src/df.rs b/src/uu/df/src/df.rs
index 36edc4ff2..58b0be4ed 100644
--- a/src/uu/df/src/df.rs
+++ b/src/uu/df/src/df.rs
@@ -28,7 +28,7 @@ use winapi::um::fileapi::{
     GetVolumePathNamesForVolumeNameW, QueryDosDeviceW,
 };
 
-use number_prefix::{binary_prefix, decimal_prefix, PrefixNames, Prefixed, Standalone};
+use number_prefix::NumberPrefix;
 use std::cell::Cell;
 use std::collections::HashMap;
 use std::collections::HashSet;
@@ -716,14 +716,14 @@ fn human_readable(value: u64, base: i64) -> String {
 
         // ref: [Binary prefix](https://en.wikipedia.org/wiki/Binary_prefix) @@ <https://archive.is/cnwmF>
         // ref: [SI/metric prefix](https://en.wikipedia.org/wiki/Metric_prefix) @@ <https://archive.is/QIuLj>
-        1000 => match decimal_prefix(value as f64) {
-            Standalone(bytes) => bytes.to_string(),
-            Prefixed(prefix, bytes) => format!("{:.1}{}", bytes, prefix.symbol()),
+        1000 => match NumberPrefix::decimal(value as f64) {
+            NumberPrefix::Standalone(bytes) => bytes.to_string(),
+            NumberPrefix::Prefixed(prefix, bytes) => format!("{:.1}{}", bytes, prefix.symbol()),
         },
 
-        1024 => match binary_prefix(value as f64) {
-            Standalone(bytes) => bytes.to_string(),
-            Prefixed(prefix, bytes) => format!("{:.1}{}", bytes, prefix.symbol()),
+        1024 => match NumberPrefix::binary(value as f64) {
+            NumberPrefix::Standalone(bytes) => bytes.to_string(),
+            NumberPrefix::Prefixed(prefix, bytes) => format!("{:.1}{}", bytes, prefix.symbol()),
         },
 
         _ => crash!(EXIT_ERR, "Internal error: Unknown base value {}", base),
diff --git a/src/uu/ls/Cargo.toml b/src/uu/ls/Cargo.toml
index 93ccefe68..f53026d19 100644
--- a/src/uu/ls/Cargo.toml
+++ b/src/uu/ls/Cargo.toml
@@ -18,7 +18,7 @@ path = "src/ls.rs"
 getopts = "0.2.18"
 isatty = "0.1"
 lazy_static = "1.0.1"
-number_prefix = "0.2.8"
+number_prefix = "0.4"
 term_grid = "0.1.5"
 termsize = "0.1.6"
 time = "0.1.40"
diff --git a/src/uu/ls/src/ls.rs b/src/uu/ls/src/ls.rs
index a2f8cab95..5a20478bc 100644
--- a/src/uu/ls/src/ls.rs
+++ b/src/uu/ls/src/ls.rs
@@ -24,7 +24,7 @@ extern crate uucore;
 
 #[cfg(unix)]
 use isatty::stdout_isatty;
-use number_prefix::{decimal_prefix, Prefixed, Standalone};
+use number_prefix::NumberPrefix;
 use std::cmp::Reverse;
 #[cfg(unix)]
 use std::collections::HashMap;
@@ -525,9 +525,11 @@ fn display_date(metadata: &Metadata, options: &getopts::Matches) -> String {
 
 fn display_file_size(metadata: &Metadata, options: &getopts::Matches) -> String {
     if options.opt_present("human-readable") {
-        match decimal_prefix(metadata.len() as f64) {
-            Standalone(bytes) => bytes.to_string(),
-            Prefixed(prefix, bytes) => format!("{:.2}{}", bytes, prefix).to_uppercase(),
+        match NumberPrefix::decimal(metadata.len() as f64) {
+            NumberPrefix::Standalone(bytes) => bytes.to_string(),
+            NumberPrefix::Prefixed(prefix, bytes) => {
+                format!("{:.2}{}", bytes, prefix).to_uppercase()
+            }
         }
     } else {
         metadata.len().to_string()