diff --git a/.gitignore b/.gitignore
index 3e05188..2b3fb3e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /hex-0.2.0.crate
 /hex-0.3.1.crate
 /hex-0.3.2.crate
+/hex-0.4.0.crate
diff --git a/rust-hex.spec b/rust-hex.spec
index cebf8f6..4e9dd5e 100644
--- a/rust-hex.spec
+++ b/rust-hex.spec
@@ -5,8 +5,8 @@
 %global crate hex
 
 Name:           rust-%{crate}
-Version:        0.3.2
-Release:        6%{?dist}
+Version:        0.4.0
+Release:        1%{?dist}
 Summary:        Encoding and decoding data into/from hexadecimal representation
 
 # Upstream license specification: MIT OR Apache-2.0
@@ -64,6 +64,18 @@ which use "benchmarks" feature of "%{crate}" crate.
 %files       -n %{name}+benchmarks-devel
 %ghost %{cargo_registry}/%{crate}-%{version}/Cargo.toml
 
+%package     -n %{name}+std-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+std-devel %{_description}
+
+This package contains library source intended for building other packages
+which use "std" feature of "%{crate}" crate.
+
+%files       -n %{name}+std-devel
+%ghost %{cargo_registry}/%{crate}-%{version}/Cargo.toml
+
 %prep
 %autosetup -n %{crate}-%{version_no_tilde} -p1
 %cargo_prep
@@ -83,6 +95,9 @@ which use "benchmarks" feature of "%{crate}" crate.
 %endif
 
 %changelog
+* Tue Nov 19 09:45:21 CET 2019 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.4.0-1
+- Update to 0.4.0
+
 * Fri Jul 26 2019 Fedora Release Engineering <releng@fedoraproject.org> - 0.3.2-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild
 
diff --git a/sources b/sources
index 2354595..eb82aa9 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (hex-0.3.2.crate) = fbb5e86da5c7fd4b7ebc505d4c0da1258b06406d40a5c6c1626f559e1a91525fa747cbb6e35a687c63216158832ceb49dc61d68cd7d74f2df3630b36ac423852
+SHA512 (hex-0.4.0.crate) = 2c1d3dd8e34ce62e429313837da7bcfdb00881e6de6269377b1a23ca689b1883a312557f186642021782288728f15783908bdbb9a7ab4a5d728325a8d273e0b3