diff --git a/mingw-w64-python-oslo-concurrency/PKGBUILD b/mingw-w64-python-oslo-concurrency/PKGBUILD
index ffe6c65302..71c7be9f2a 100644
--- a/mingw-w64-python-oslo-concurrency/PKGBUILD
+++ b/mingw-w64-python-oslo-concurrency/PKGBUILD
@@ -6,13 +6,13 @@ pkgname=("${MINGW_PACKAGE_PREFIX}-python-${_realname}")
 provides=("${MINGW_PACKAGE_PREFIX}-python3-${_realname}")
 conflicts=("${MINGW_PACKAGE_PREFIX}-python3-${_realname}")
 replaces=("${MINGW_PACKAGE_PREFIX}-python3-${_realname}")
-pkgver=4.5.0
+pkgver=4.5.1
 pkgrel=1
 pkgdesc="OpenStack library for all concurrency-related code (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64' 'clang32')
 url='https://pypi.python.org/pypi/oslo.concurrency'
-license=('Apache')
+license=('spdx:Apache-2.0')
 depends=("${MINGW_PACKAGE_PREFIX}-python-pbr"
          "${MINGW_PACKAGE_PREFIX}-python-oslo-config"
          "${MINGW_PACKAGE_PREFIX}-python-oslo-i18n"
@@ -23,7 +23,7 @@ checkdepends=("${MINGW_PACKAGE_PREFIX}-python-oslotest"
               "${MINGW_PACKAGE_PREFIX}-python-eventlet")
 options=('staticlibs' 'strip' '!debug')
 source=("${_realname}-${pkgver}.tar.gz::https://github.com/openstack/oslo.concurrency/archive/${pkgver}.tar.gz")
-sha512sums=('17322fc21d98f0821be20015abd6d1dc1d9af48c9669bc1c3b4f22e529fa49dfb741baae7282ec9f7312040b2227d1657fea4c76089e64fb83d66c9f89d9e78a')
+sha512sums=('c3e1907df0133e9ec72161c8cb9b0c5af03a64446fc87a87ca81a8b9e99dcf983183a6f4b0bbcddaf9cec714cff247b0d497de7f78305c7f3e8862edf789d69b')
 
 # Helper macros to help make tasks easier #
 apply_patch_with_msg() {
@@ -48,8 +48,8 @@ prepare() {
   cd "${srcdir}/oslo.concurrency-${pkgver}"
 
   cd "${srcdir}"
-  rm -rf python-build-${CARCH} | true
-  cp -r "oslo.concurrency-${pkgver}" "python-build-${CARCH}"
+  rm -rf python-build-${MSYSTEM} | true
+  cp -r "oslo.concurrency-${pkgver}" "python-build-${MSYSTEM}"
 
   # Set version for setuptools_scm
   export SETUPTOOLS_SCM_PRETEND_VERSION=${pkgver}
@@ -57,17 +57,17 @@ prepare() {
 }
 
 build() {
-  cd "${srcdir}/python-build-${CARCH}"
+  cd "${srcdir}/python-build-${MSYSTEM}"
   ${MINGW_PREFIX}/bin/python setup.py build
 }
 
 check() {
-  cd "${srcdir}/python-build-${CARCH}"
+  cd "${srcdir}/python-build-${MSYSTEM}"
   PYTHON=${MINGW_PREFIX}/bin/python ${MINGW_PREFIX}/bin/stestr run || warning "Tests failed"
 }
 
 package() {
-  cd "${srcdir}/python-build-${CARCH}"
+  cd "${srcdir}/python-build-${MSYSTEM}"
 
   MSYS2_ARG_CONV_EXCL="--prefix=;--install-scripts=;--install-platlib=" \
   ${MINGW_PREFIX}/bin/python setup.py install --prefix=${MINGW_PREFIX} \