diff --git a/0001-port-to-number_prefix-0.4.patch b/0001-port-to-number_prefix-0.4.patch
new file mode 100644
index 0000000..4744373
--- /dev/null
+++ b/0001-port-to-number_prefix-0.4.patch
@@ -0,0 +1,58 @@
+From 5d9ef658048057348644bf4ddc85543197f31123 Mon Sep 17 00:00:00 2001
+From: Fabio Valentini <decathorpe@gmail.com>
+Date: Tue, 20 Jul 2021 15:44:44 +0200
+Subject: [PATCH] port to number_prefix 0.4
+
+---
+ src/format.rs | 14 +++++++-------
+ 1 file changed, 7 insertions(+), 7 deletions(-)
+
+diff --git a/src/format.rs b/src/format.rs
+index 99eb0c4..7333248 100644
+--- a/src/format.rs
++++ b/src/format.rs
+@@ -1,7 +1,7 @@
+ use std::fmt;
+ use std::time::Duration;
+ 
+-use number_prefix::{NumberPrefix, PrefixNames, Prefixed, Standalone};
++use number_prefix::NumberPrefix;
+ 
+ /// Wraps an std duration for human basic formatting.
+ #[derive(Debug)]
+@@ -77,8 +77,8 @@ impl fmt::Display for HumanDuration {
+ impl fmt::Display for HumanBytes {
+     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+         match NumberPrefix::binary(self.0 as f64) {
+-            Standalone(number) => write!(f, "{:.0}B", number),
+-            Prefixed(prefix, number) => write!(
++            NumberPrefix::Standalone(number) => write!(f, "{:.0}B", number),
++            NumberPrefix::Prefixed(prefix, number) => write!(
+                 f,
+                 "{:.2}{}B",
+                 number,
+@@ -91,8 +91,8 @@ impl fmt::Display for HumanBytes {
+ impl fmt::Display for DecimalBytes {
+     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+         match NumberPrefix::decimal(self.0 as f64) {
+-            Standalone(number) => write!(f, "{:.0}B", number),
+-            Prefixed(prefix, number) => write!(f, "{:.2}{}B", number, prefix),
++            NumberPrefix::Standalone(number) => write!(f, "{:.0}B", number),
++            NumberPrefix::Prefixed(prefix, number) => write!(f, "{:.2}{}B", number, prefix),
+         }
+     }
+ }
+@@ -100,8 +100,8 @@ impl fmt::Display for DecimalBytes {
+ impl fmt::Display for BinaryBytes {
+     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+         match NumberPrefix::binary(self.0 as f64) {
+-            Standalone(number) => write!(f, "{:.0}B", number),
+-            Prefixed(prefix, number) => write!(f, "{:.2}{}B", number, prefix),
++            NumberPrefix::Standalone(number) => write!(f, "{:.0}B", number),
++            NumberPrefix::Prefixed(prefix, number) => write!(f, "{:.2}{}B", number, prefix),
+         }
+     }
+ }
+-- 
+2.31.1
+
diff --git a/indicatif-fix-metadata.diff b/indicatif-fix-metadata.diff
new file mode 100644
index 0000000..abb95cd
--- /dev/null
+++ b/indicatif-fix-metadata.diff
@@ -0,0 +1,11 @@
+--- indicatif-0.15.0/Cargo.toml	2020-06-14T22:23:13+00:00
++++ indicatif-0.15.0/Cargo.toml	2021-07-20T13:40:06.248644+00:00
+@@ -29,7 +29,7 @@
+ version = "1.0"
+ 
+ [dependencies.number_prefix]
+-version = "0.3"
++version = "0.4"
+ 
+ [dependencies.rayon]
+ version = "1.0"
diff --git a/rust-indicatif.spec b/rust-indicatif.spec
index 3d48861..c1b5d78 100644
--- a/rust-indicatif.spec
+++ b/rust-indicatif.spec
@@ -1,4 +1,4 @@
-# Generated by rust2rpm 15
+# Generated by rust2rpm 18
 %bcond_without check
 %global debug_package %{nil}
 
@@ -6,13 +6,19 @@
 
 Name:           rust-%{crate}
 Version:        0.15.0
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Progress bar and cli reporting library for Rust
 
 # Upstream license specification: MIT
 License:        MIT
 URL:            https://crates.io/crates/indicatif
 Source:         %{crates_source}
+# Initial patched metadata
+# * bump number_prefix from 0.3 to 0.4 (already upstream)
+Patch0:         indicatif-fix-metadata.diff
+# * adapt to number_prefix 0.4 API changes:
+#   https://github.com/mitsuhiko/indicatif/commit/c3403b8
+Patch1:         0001-port-to-number_prefix-0.4.patch
 
 ExclusiveArch:  %{rust_arches}
 %if %{__cargo_skip_build}
@@ -131,6 +137,9 @@ which use "with_rayon" feature of "%{crate}" crate.
 %endif
 
 %changelog
+* Tue Jul 20 2021 Fabio Valentini <decathorpe@gmail.com> - 0.15.0-4
+- Update number_prefix to 0.4.
+
 * Wed Jan 27 2021 Fedora Release Engineering <releng@fedoraproject.org> - 0.15.0-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild