diff --git a/Cargo.lock b/Cargo.lock
index 2d97cb2..c1db77b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,48 +2,51 @@
 # It is not intended for manual editing.
 [[package]]
 name = "ansi_term"
-version = "0.12.0"
+version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eaa72766c3585a1f812a3387a7e2c6cab780f899c2f43ff6ea06c8d071fcbb36"
+checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
 dependencies = [
- "winapi 0.3.8",
+ "winapi",
 ]
 
 [[package]]
 name = "autocfg"
-version = "0.1.5"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22130e92352b948e7e82a49cdb0aa94f2211761117f29e052dd397c1ac33542b"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
 
 [[package]]
 name = "bitflags"
-version = "1.1.0"
+version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d155346769a6855b86399e9bc3814ab343cd3d62c7e985113d46a0ec3c281fd"
+checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
 [[package]]
 name = "byteorder"
-version = "1.3.2"
+version = "1.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a7c3dd8985a7111efc5c80b44e23ecdd8c007de8ade3b96595387e812b957cf5"
+checksum = "08c48aae112d48ed9f069b33538ea9e3e90aa263cfa3d1c24309612b1f7472de"
 
 [[package]]
 name = "cc"
-version = "1.0.37"
+version = "1.0.61"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39f75544d7bbaf57560d2168f28fd649ff9c76153874db88bdbdfd839b1a7e7d"
+checksum = "ed67cbde08356238e75fc4656be4749481eeffb09e19f320a25237d5221c985d"
+dependencies = [
+ "jobserver",
+]
 
 [[package]]
 name = "cfg-if"
-version = "0.1.9"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b486ce3ccf7ffd79fdeb678eac06a9e6c09fc88d33836340becb8fffe87c5e33"
+checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
 [[package]]
 name = "datetime"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4ce78cadfc77450e21ff8bd11ca6f8669949b3b0bd8af92f9c1ee4fb453db7b"
+checksum = "d0fcb4df22ae812fa2f6d5e3b577247584cc67fce06ad0779168d1dd41cbcce3"
 dependencies = [
  "iso8601",
  "libc",
@@ -51,7 +54,7 @@ dependencies = [
  "num-traits",
  "pad",
  "redox_syscall",
- "winapi 0.3.8",
+ "winapi",
 ]
 
 [[package]]
@@ -79,9 +82,9 @@ dependencies = [
 
 [[package]]
 name = "git2"
-version = "0.9.1"
+version = "0.13.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "924b2e7d2986e625dcad89e8a429a7b3adee3c3d71e585f4a66c4f7e78715e31"
+checksum = "1e094214efbc7fdbbdee952147e493b00e99a4e52817492277e98967ae918165"
 dependencies = [
  "bitflags",
  "libc",
@@ -98,10 +101,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"
 
 [[package]]
-name = "idna"
-version = "0.1.5"
+name = "hermit-abi"
+version = "0.1.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38f09e0f0b1fb55fdee1f17470ad800da77af5186a1a76c026b679358b7e844e"
+checksum = "5aca5565f760fb5b220e499d72710ed156fdb74e631659e99377d9ebfbd13ae8"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "idna"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "02e2673c30ee86b5b96a9cb52ad15718aa1f966f5ab9ad54a8b95d5ca33120a9"
 dependencies = [
  "matches",
  "unicode-bidi",
@@ -118,32 +130,31 @@ dependencies = [
 ]
 
 [[package]]
-name = "kernel32-sys"
-version = "0.2.2"
+name = "jobserver"
+version = "0.1.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
+checksum = "5c71313ebb9439f74b00d9d2dcec36440beaf57a6aa0623068441dd7cd81a7f2"
 dependencies = [
- "winapi 0.2.8",
- "winapi-build",
+ "libc",
 ]
 
 [[package]]
 name = "lazy_static"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc5729f27f159ddd61f4df6228e827e86643d4d3e7c32183cb30a1c08f604a14"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.60"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d44e80633f007889c7eff624b709ab43c92d708caad982295768a7b13ca3b5eb"
+checksum = "2448f6066e80e3bfc792e9c98bf705b4b0fc6e8ef5b43e5889aff0eaa9c58743"
 
 [[package]]
 name = "libgit2-sys"
-version = "0.8.1"
+version = "0.12.13+1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "941a41e23f77323b8c9d2ee118aec9ee39dfc176078c18b4757d3bad049d9ff7"
+checksum = "069eea34f76ec15f2822ccf78fe0cdb8c9016764d0a12865278585a74dbdeae5"
 dependencies = [
  "cc",
  "libc",
@@ -153,9 +164,9 @@ dependencies = [
 
 [[package]]
 name = "libz-sys"
-version = "1.0.25"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2eb5e43362e38e2bca2fd5f5134c4d4564a23a5c28e9b95411652021a8675ebe"
+checksum = "602113192b08db8f38796c4e85c39e960c145965140e918018bcde1952429655"
 dependencies = [
  "cc",
  "libc",
@@ -174,9 +185,9 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.7"
+version = "0.4.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c275b6ad54070ac2d665eef9197db647b32239c9d244bfb6f041a766d00da5b3"
+checksum = "4fabed175da42fed1fa0746b0ea71f412aa9d35e76e95e59b192c64b9dc2bf8b"
 dependencies = [
  "cfg-if",
 ]
@@ -189,9 +200,9 @@ checksum = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
 
 [[package]]
 name = "memchr"
-version = "2.2.1"
+version = "2.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88579771288728879b57485cc7d6b07d648c9f0141eb955f8ab7f9d45394468e"
+checksum = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400"
 
 [[package]]
 name = "natord"
@@ -211,42 +222,43 @@ dependencies = [
 
 [[package]]
 name = "num-traits"
-version = "0.2.8"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ba9a427cfca2be13aa6f6403b0b7e7368fe982bfa16fccc450ce74c46cd9b32"
+checksum = "ac267bcc07f48ee5f8935ab0d24f316fb722d7a1292e2913f0cc196b29ffd611"
 dependencies = [
  "autocfg",
 ]
 
 [[package]]
 name = "num_cpus"
-version = "1.10.1"
+version = "1.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bcef43580c035376c0705c42792c294b66974abbfd2789b511784023f71f3273"
+checksum = "05499f3756671c15885fee9034446956fff3f243d6077b91e5767df161f766b3"
 dependencies = [
+ "hermit-abi",
  "libc",
 ]
 
 [[package]]
 name = "number_prefix"
-version = "0.3.0"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "17b02fc0ff9a9e4b35b3342880f48e896ebf69f2967921fe8646bf5b7125956a"
+checksum = "830b246a0e5f20af87141b25c173cd1b609bd7779a4617d6ec582abaf90870f3"
 
 [[package]]
 name = "openssl-src"
-version = "111.3.0+1.1.1c"
+version = "111.11.0+1.1.1h"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53ed5f31d294bdf5f7a4ba0a206c2754b0f60e9a63b7e3076babc5317873c797"
+checksum = "380fe324132bea01f45239fadfec9343adb044615f29930d039bec1ae7b9fa5b"
 dependencies = [
  "cc",
 ]
 
 [[package]]
 name = "openssl-sys"
-version = "0.9.48"
+version = "0.9.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b5ba300217253bcc5dc68bed23d782affa45000193866e025329aa8a7a9f05b8"
+checksum = "a842db4709b604f0fe5d1170ae3565899be2ad3d9cbc72dedc789ac0511f78de"
 dependencies = [
  "autocfg",
  "cc",
@@ -258,30 +270,30 @@ dependencies = [
 
 [[package]]
 name = "pad"
-version = "0.1.5"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c9b8de33465981073e32e1d75bb89ade49062bb853e7c97ec2c13439095563a"
+checksum = "d2ad9b889f1b12e0b9ee24db044b5129150d5eada288edc800f789928dc8c0e3"
 dependencies = [
  "unicode-width",
 ]
 
 [[package]]
 name = "percent-encoding"
-version = "1.0.1"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "31010dd2e1ac33d5b46a5b413495239882813e0369f8ed8a5e266f173602f831"
+checksum = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
 
 [[package]]
 name = "pkg-config"
-version = "0.3.14"
+version = "0.3.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "676e8eb2b1b4c9043511a9b7bea0915320d7e502b0a079fb03f9635a5252b18c"
+checksum = "d36492546b6af1463394d46f0c834346f31548646f6ba10849802c9c9a27ac33"
 
 [[package]]
 name = "redox_syscall"
-version = "0.1.56"
+version = "0.1.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2439c63f3f6139d1b57529d16bc3b8bb855230c8efcc5d3a896c8bea7c3b1e84"
+checksum = "41cc0f7e4d5d4544e8861606a285bb08d3e70712ccc7d2b84d7c0ccfaf4b05ce"
 
 [[package]]
 name = "scoped_threadpool"
@@ -289,12 +301,6 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1d51f5df5af43ab3f1360b429fa5e0152ac5ce8c0bd6485cae490332e96846a8"
 
-[[package]]
-name = "smallvec"
-version = "0.6.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab606a9c5e214920bb66c458cd7be8ef094f813f20fe77a54cc7dbfff220d4b7"
-
 [[package]]
 name = "term_grid"
 version = "0.1.7"
@@ -306,15 +312,20 @@ dependencies = [
 
 [[package]]
 name = "term_size"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e5b9a66db815dcfd2da92db471106457082577c3c278d4138ab3e3b4e189327"
+checksum = "1e4129646ca0ed8f45d09b929036bafad5377103edd06e50bf574b353d2b08d9"
 dependencies = [
- "kernel32-sys",
  "libc",
- "winapi 0.2.8",
+ "winapi",
 ]
 
+[[package]]
+name = "tinyvec"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "238ce071d267c5710f9d31451efec16c5ee22de34df17cc05e56cbc92e967117"
+
 [[package]]
 name = "unicode-bidi"
 version = "0.3.4"
@@ -326,24 +337,24 @@ dependencies = [
 
 [[package]]
 name = "unicode-normalization"
-version = "0.1.8"
+version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "141339a08b982d942be2ca06ff8b076563cbe223d1befd5450716790d44e2426"
+checksum = "6fb19cf769fa8c6a80a162df694621ebeb4dafb606470b2b2fce0be40a98a977"
 dependencies = [
- "smallvec",
+ "tinyvec",
 ]
 
 [[package]]
 name = "unicode-width"
-version = "0.1.5"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "882386231c45df4700b275c7ff55b6f3698780a650026380e72dabe76fa46526"
+checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
 
 [[package]]
 name = "url"
-version = "1.7.2"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd4e7c0d531266369519a4aa4f399d748bd37043b00bde1e4ff1f60a120b355a"
+checksum = "829d4a8476c35c9bf0bbce5a3b23f4106f79728039b726d292bb93bc106787cb"
 dependencies = [
  "idna",
  "matches",
@@ -362,9 +373,9 @@ dependencies = [
 
 [[package]]
 name = "vcpkg"
-version = "0.2.7"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "33dd455d0f96e90a75803cfeb7f948768c08d70a6de9a8d2362461935698bf95"
+checksum = "6454029bf181f092ad1b853286f23e2c507d8e8194d01d92da4a55c274a5508c"
 
 [[package]]
 name = "version_check"
@@ -374,26 +385,14 @@ checksum = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
 
 [[package]]
 name = "winapi"
-version = "0.2.8"
+version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
-
-[[package]]
-name = "winapi"
-version = "0.3.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
 dependencies = [
  "winapi-i686-pc-windows-gnu",
  "winapi-x86_64-pc-windows-gnu",
 ]
 
-[[package]]
-name = "winapi-build"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
-
 [[package]]
 name = "winapi-i686-pc-windows-gnu"
 version = "0.4.0"
diff --git a/Cargo.toml b/Cargo.toml
index fcb94d5..b36a776 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,25 +22,25 @@ name = "exa"
 
 
 [dependencies]
-ansi_term = "0.12.0"
+ansi_term = "0.12"
 datetime = "0.5"
-glob = "0.3.0"
-lazy_static = "1.3.0"
-libc = "0.2.51"
-locale = "0.2.2"
-log = "0.4.6"
-natord = "1.0.9"
-num_cpus = "1.10.0"
-number_prefix = "0.3.0"
-scoped_threadpool = "0.1.9"
-term_grid = "0.1.7"
-term_size = "0.3.1"
-unicode-width = "0.1.5"
+glob = "0.3"
+lazy_static = "1.3"
+libc = "0.2"
+locale = "0.2"
+log = "0.4"
+natord = "1.0"
+num_cpus = "1.10"
+number_prefix = "0.4"
+scoped_threadpool = "0.1"
+term_grid = "0.1"
+term_size = "0.3"
+unicode-width = "0.1"
 users = "0.11"
 zoneinfo_compiled = "0.5"
 
 [dependencies.git2]
-version = "0.9.1"
+version = "0.13"
 optional = true
 default-features = false
 
diff --git a/Justfile b/Justfile
index d892165..b0df560 100644
--- a/Justfile
+++ b/Justfile
@@ -28,6 +28,12 @@ test-features:
     cargo hack test --feature-powerset -- --quiet
 
 
+# updates dependency versions, and checks for outdated ones
+@update:
+    cargo update
+    cargo outdated
+
+
 # prints versions of the necessary build tools
 @versions:
     rustc --version
diff --git a/src/output/render/size.rs b/src/output/render/size.rs
index b46caab..d44ecd3 100644
--- a/src/output/render/size.rs
+++ b/src/output/render/size.rs
@@ -9,7 +9,7 @@ use crate::output::table::SizeFormat;
 
 impl f::Size {
     pub fn render<C: Colours>(&self, colours: &C, size_format: SizeFormat, numerics: &NumericLocale) -> TextCell {
-        use number_prefix::{Prefixed, Standalone, NumberPrefix, PrefixNames};
+        use number_prefix::NumberPrefix;
 
         let size = match *self {
             f::Size::Some(s)             => s,
@@ -23,8 +23,8 @@ impl f::Size {
             SizeFormat::JustBytes     => {
                 // Use the binary prefix to select a style.
                 let prefix = match NumberPrefix::binary(size as f64) {
-                    Standalone(_) => None,
-                    Prefixed(p, _) => Some(p),
+                    NumberPrefix::Standalone(_) => None,
+                    NumberPrefix::Prefixed(p, _) => Some(p),
                 };
                 // But format the number directly using the locale.
                 let string = numerics.format_int(size);
@@ -33,8 +33,8 @@ impl f::Size {
         };
 
         let (prefix, n) = match result {
-            Standalone(b)  => return TextCell::paint(colours.size(None), b.to_string()),
-            Prefixed(p, n) => (p, n)
+            NumberPrefix::Standalone(b)  => return TextCell::paint(colours.size(None), b.to_string()),
+            NumberPrefix::Prefixed(p, n) => (p, n)
         };
 
         let symbol = prefix.symbol();
diff --git a/src/style/colours.rs b/src/style/colours.rs
index e8012a9..debda16 100644
--- a/src/style/colours.rs
+++ b/src/style/colours.rs
@@ -434,7 +434,7 @@ impl render::SizeColours for Colours {
         match prefix {
             None                    => self.size.number_byte,
             Some(Kilo) | Some(Kibi) => self.size.number_kilo,
-            Some(Mega) | Some(Mibi) => self.size.number_mega,
+            Some(Mega) | Some(Mebi) => self.size.number_mega,
             Some(Giga) | Some(Gibi) => self.size.number_giga,
             Some(_)                 => self.size.number_huge,
         }
@@ -445,7 +445,7 @@ impl render::SizeColours for Colours {
         match prefix {
             None                    => self.size.unit_byte,
             Some(Kilo) | Some(Kibi) => self.size.unit_kilo,
-            Some(Mega) | Some(Mibi) => self.size.unit_mega,
+            Some(Mega) | Some(Mebi) => self.size.unit_mega,
             Some(Giga) | Some(Gibi) => self.size.unit_giga,
             Some(_)                 => self.size.unit_huge,
         }