diff --git a/.gitignore b/.gitignore
index 444c1bc..42db1cc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 /byte-unit-3.1.1.crate
 /byte-unit-3.1.2.crate
 /byte-unit-3.1.3.crate
+/byte-unit-4.0.9.crate
diff --git a/rust-byte-unit.spec b/rust-byte-unit.spec
index a24cad1..e1367de 100644
--- a/rust-byte-unit.spec
+++ b/rust-byte-unit.spec
@@ -1,12 +1,12 @@
-# Generated by rust2rpm 15
+# Generated by rust2rpm 16
 %bcond_without check
 %global debug_package %{nil}
 
 %global crate byte-unit
 
 Name:           rust-%{crate}
-Version:        3.1.3
-Release:        2%{?dist}
+Version:        4.0.9
+Release:        1%{?dist}
 Summary:        Library for interaction with units of bytes
 
 # Upstream license specification: MIT
@@ -52,6 +52,18 @@ which use "default" feature of "%{crate}" crate.
 %files       -n %{name}+default-devel
 %ghost %{cargo_registry}/%{crate}-%{version_no_tilde}/Cargo.toml
 
+%package     -n %{name}+serde-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+serde-devel %{_description}
+
+This package contains library source intended for building other packages
+which use "serde" feature of "%{crate}" crate.
+
+%files       -n %{name}+serde-devel
+%ghost %{cargo_registry}/%{crate}-%{version_no_tilde}/Cargo.toml
+
 %package     -n %{name}+std-devel
 Summary:        %{summary}
 BuildArch:      noarch
@@ -95,6 +107,10 @@ which use "u128" feature of "%{crate}" crate.
 %endif
 
 %changelog
+* Mon Nov 30 2020 Fabio Valentini <decathorpe@gmail.com> - 4.0.9-1
+- Update to version 4.0.9.
+- Fixes RHBZ#1851602
+
 * Wed Jul 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 3.1.3-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
 
diff --git a/sources b/sources
index 3905957..9ff1b9e 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (byte-unit-3.1.3.crate) = 981b075e6049e091071d0241415a4a575978b9438017b0b64864c32c48af02ad60f185a81c571edc68152c1fc489b825f7aebbba4ad7f2c26ec25f1500cba2a9
+SHA512 (byte-unit-4.0.9.crate) = 85d7bddc3560d75fb8436a8094ab4a74cf5fcf83085c0b1ba883e17a5252de321bf1be6c23d572a64b14ce7650116c80e87215c78fc53735c27dd1d8d7bc4898