diff --git a/.gitignore b/.gitignore
index 1bd3ef9..f62268a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,3 +19,10 @@
 /once_cell-1.7.1.crate
 /once_cell-1.7.2.crate
 /once_cell-1.8.0.crate
+/once_cell-1.9.0.crate
+/once_cell-1.10.0.crate
+/once_cell-1.12.0.crate
+/once_cell-1.13.0.crate
+/once_cell-1.13.1.crate
+/once_cell-1.14.0.crate
+/once_cell-1.15.0.crate
diff --git a/rust-once_cell.spec b/rust-once_cell.spec
index 0c1b5ee..496ac7f 100644
--- a/rust-once_cell.spec
+++ b/rust-once_cell.spec
@@ -1,25 +1,21 @@
-# Generated by rust2rpm 19
+# Generated by rust2rpm 22
 %bcond_without check
 %global debug_package %{nil}
 
 %global crate once_cell
 
-Name:           rust-%{crate}
-Version:        1.8.0
+Name:           rust-once_cell
+Version:        1.15.0
 Release:        %autorelease
 Summary:        Single assignment cells and lazy values
 
-# Upstream license specification: MIT OR Apache-2.0
-License:        MIT or ASL 2.0
+License:        MIT OR Apache-2.0
 URL:            https://crates.io/crates/once_cell
 Source:         %{crates_source}
 
 ExclusiveArch:  %{rust_arches}
-%if %{__cargo_skip_build}
-BuildArch:      noarch
-%endif
 
-BuildRequires:  rust-packaging
+BuildRequires:  rust-packaging >= 21
 
 %global _description %{expand:
 Single assignment cells and lazy values.}
@@ -33,12 +29,14 @@ BuildArch:      noarch
 %description    devel %{_description}
 
 This package contains library source intended for building other packages which
-use "%{crate}" crate.
+use the "%{crate}" crate.
 
 %files          devel
-%license LICENSE-APACHE LICENSE-MIT
-%doc CHANGELOG.md README.md
-%{cargo_registry}/%{crate}-%{version_no_tilde}/
+%license %{crate_instdir}/LICENSE-APACHE
+%license %{crate_instdir}/LICENSE-MIT
+%doc %{crate_instdir}/CHANGELOG.md
+%doc %{crate_instdir}/README.md
+%{crate_instdir}/
 
 %package     -n %{name}+default-devel
 Summary:        %{summary}
@@ -47,10 +45,10 @@ BuildArch:      noarch
 %description -n %{name}+default-devel %{_description}
 
 This package contains library source intended for building other packages which
-use "the default" feature of the "%{crate}" crate.
+use the "default" feature of the "%{crate}" crate.
 
 %files       -n %{name}+default-devel
-%ghost %{cargo_registry}/%{crate}-%{version_no_tilde}/Cargo.toml
+%ghost %{crate_instdir}/Cargo.toml
 
 %package     -n %{name}+alloc-devel
 Summary:        %{summary}
@@ -59,10 +57,10 @@ BuildArch:      noarch
 %description -n %{name}+alloc-devel %{_description}
 
 This package contains library source intended for building other packages which
-use "the alloc" feature of the "%{crate}" crate.
+use the "alloc" feature of the "%{crate}" crate.
 
 %files       -n %{name}+alloc-devel
-%ghost %{cargo_registry}/%{crate}-%{version_no_tilde}/Cargo.toml
+%ghost %{crate_instdir}/Cargo.toml
 
 %package     -n %{name}+parking_lot-devel
 Summary:        %{summary}
@@ -71,10 +69,22 @@ BuildArch:      noarch
 %description -n %{name}+parking_lot-devel %{_description}
 
 This package contains library source intended for building other packages which
-use "the parking_lot" feature of the "%{crate}" crate.
+use the "parking_lot" feature of the "%{crate}" crate.
 
 %files       -n %{name}+parking_lot-devel
-%ghost %{cargo_registry}/%{crate}-%{version_no_tilde}/Cargo.toml
+%ghost %{crate_instdir}/Cargo.toml
+
+%package     -n %{name}+parking_lot_core-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+parking_lot_core-devel %{_description}
+
+This package contains library source intended for building other packages which
+use the "parking_lot_core" feature of the "%{crate}" crate.
+
+%files       -n %{name}+parking_lot_core-devel
+%ghost %{crate_instdir}/Cargo.toml
 
 %package     -n %{name}+race-devel
 Summary:        %{summary}
@@ -83,10 +93,10 @@ BuildArch:      noarch
 %description -n %{name}+race-devel %{_description}
 
 This package contains library source intended for building other packages which
-use "the race" feature of the "%{crate}" crate.
+use the "race" feature of the "%{crate}" crate.
 
 %files       -n %{name}+race-devel
-%ghost %{cargo_registry}/%{crate}-%{version_no_tilde}/Cargo.toml
+%ghost %{crate_instdir}/Cargo.toml
 
 %package     -n %{name}+std-devel
 Summary:        %{summary}
@@ -95,10 +105,10 @@ BuildArch:      noarch
 %description -n %{name}+std-devel %{_description}
 
 This package contains library source intended for building other packages which
-use "the std" feature of the "%{crate}" crate.
+use the "std" feature of the "%{crate}" crate.
 
 %files       -n %{name}+std-devel
-%ghost %{cargo_registry}/%{crate}-%{version_no_tilde}/Cargo.toml
+%ghost %{crate_instdir}/Cargo.toml
 
 %package     -n %{name}+unstable-devel
 Summary:        %{summary}
@@ -107,10 +117,10 @@ BuildArch:      noarch
 %description -n %{name}+unstable-devel %{_description}
 
 This package contains library source intended for building other packages which
-use "the unstable" feature of the "%{crate}" crate.
+use the "unstable" feature of the "%{crate}" crate.
 
 %files       -n %{name}+unstable-devel
-%ghost %{cargo_registry}/%{crate}-%{version_no_tilde}/Cargo.toml
+%ghost %{crate_instdir}/Cargo.toml
 
 %prep
 %autosetup -n %{crate}-%{version_no_tilde} -p1
diff --git a/rust2rpm.conf b/rust2rpm.conf
new file mode 100644
index 0000000..6593735
--- /dev/null
+++ b/rust2rpm.conf
@@ -0,0 +1,3 @@
+[DEFAULT]
+unwanted-features =
+  atomic-polyfill
diff --git a/sources b/sources
index 125c615..9faafbb 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (once_cell-1.8.0.crate) = 88e55c9433225ce85a08353168c87fca2237615482160a5c28f3ac17f06d48c63e0c21b5f7ef81f82ca133436e371802ea099453844f1c111003bcb6ba89e827
+SHA512 (once_cell-1.15.0.crate) = 934a7c3631e9ca4fa78d9577b6672ca0b2f926a8d6c3be9542b906c5968033446f98f76ae6f368a1a5b92ab9064c31a57d74ab6d2097108029a7ea951541ff7e