diff --git a/sdk_container/src/third_party/portage-stable/dev-python/cython/Manifest b/sdk_container/src/third_party/portage-stable/dev-python/cython/Manifest
index 46dd0ff7bd..b636c77753 100644
--- a/sdk_container/src/third_party/portage-stable/dev-python/cython/Manifest
+++ b/sdk_container/src/third_party/portage-stable/dev-python/cython/Manifest
@@ -1,3 +1,3 @@
-DIST cython-0.29.33.gh.tar.gz 2113910 BLAKE2B 9212edfa36680a3243632d28c4f5616a7336e82ee1f96df7d5e29711056619639c9a8fe9bbf9aea0a86aed39e836dc6eaa112ad35080f530add6309ccd09c53c SHA512 85f5ba7159d8793dbda980140b26086727f356a71d78f8522419657841d07b865d09c2f0a0f77d398669d071c1d261060235321a19eb7808e35d24f8ac71560d
 DIST cython-0.29.34.gh.tar.gz 2114639 BLAKE2B c5f70fd3e6074d9030a1035bc98d71b703e0f391b61bd91f3ffba2c35a29a98b9ff8ef2047e7c75743ead280f0f06a924abe84ae8bf7696b65da662a3c58ee0c SHA512 51679d1304d0f87dfb51e60c753f1ce60027f855a91cf130a5dcf84353884a7dcf09c01701945ae2f9173f8f095890c377d5faac28c2f01d7f764609c0130411
-DIST cython-3.0.0b2.gh.tar.gz 2669448 BLAKE2B 87602a43f77f8005adfc71ec0598a12212db917071dd2ae9a7d0d909411e38525290d860a8606600a5e1b07b014da65d2398f04818837fb15f66bcdba0cad965 SHA512 2095a556bc83669a89902a71da2164fbfab2b75cec2de95c91f95b6b3639bc5802b09808059896ed564b0d6e0539e497051614572bc8ba5d678d0410ccc3914f
+DIST cython-0.29.35.gh.tar.gz 2115190 BLAKE2B ac23abbd2b560ee52a79840d995a4cf36ddb3a8705b9327010f1ad6add8028185c15703efcc1d59b581d65b5de38e123c0f07c36fe6ffe54a6efee7512161344 SHA512 35d679d94e1f731e004b83fb4ae0d569703b0800c913012308146b1c54463ce12cb1cf3733e24162fb357f179444c5ca31108a37850e6c749ddebac5175119f5
+DIST cython-3.0.0b3.gh.tar.gz 2688784 BLAKE2B 933bb48b2bf5169c973a36c877a36eae28b80409a7ff395b82a14ac0740247496df3c9f2d69884c823b7475069f0c75d6cbbb964b88de60b38082e6e36659bff SHA512 f1d0fdcec4bc6b0f6cb66078592424fdcb7a028b79c5b9d41280ae112235736d11c9f4f793e810007e880ae0def195ac25999db59065c7f7bdcfab84b06bf7d3
diff --git a/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-0.29.33.ebuild b/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-0.29.33.ebuild
deleted file mode 100644
index 4bcdbfc1fa..0000000000
--- a/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-0.29.33.ebuild
+++ /dev/null
@@ -1,90 +0,0 @@
-# Copyright 1999-2023 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=8
-
-DISTUTILS_USE_PEP517=setuptools
-PYTHON_COMPAT=( python3_{9..11} pypy3 )
-PYTHON_REQ_USE="threads(+)"
-
-inherit distutils-r1 toolchain-funcs elisp-common
-
-DESCRIPTION="A Python to C compiler"
-HOMEPAGE="
-	https://cython.org/
-	https://github.com/cython/cython/
-	https://pypi.org/project/Cython/
-"
-SRC_URI="
-	https://github.com/cython/cython/archive/${PV}.tar.gz
-		-> ${P}.gh.tar.gz
-"
-
-LICENSE="Apache-2.0"
-SLOT="0"
-KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 sparc x86 ~x64-cygwin ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris ~x86-solaris"
-IUSE="emacs test"
-RESTRICT="!test? ( test )"
-
-RDEPEND="
-	emacs? ( >=app-editors/emacs-23.1:* )
-"
-BDEPEND="
-	${RDEPEND}
-	test? (
-		$(python_gen_cond_dep '
-			dev-python/numpy[${PYTHON_USEDEP}]
-		' python3_{8..10})
-	)
-"
-
-PATCHES=(
-	"${FILESDIR}/${PN}-0.29.22-spawn-multiprocessing.patch"
-	"${FILESDIR}/${PN}-0.29.23-test_exceptions-py310.patch"
-)
-
-SITEFILE=50cython-gentoo.el
-
-distutils_enable_sphinx docs
-
-python_compile() {
-	# Python gets confused when it is in sys.path before build.
-	local -x PYTHONPATH=
-
-	distutils-r1_python_compile
-}
-
-python_compile_all() {
-	use emacs && elisp-compile Tools/cython-mode.el
-}
-
-python_test() {
-	if has "${EPYTHON}" pypy3 python3.11; then
-		einfo "Skipping tests on ${EPYTHON} (xfail)"
-		return
-	fi
-
-	tc-export CC
-	# https://github.com/cython/cython/issues/1911
-	local -x CFLAGS="${CFLAGS} -fno-strict-overflow"
-	"${PYTHON}" runtests.py -vv --work-dir "${BUILD_DIR}"/tests ||
-		die "Tests fail with ${EPYTHON}"
-}
-
-python_install_all() {
-	local DOCS=( CHANGES.rst README.rst ToDo.txt USAGE.txt )
-	distutils-r1_python_install_all
-
-	if use emacs; then
-		elisp-install ${PN} Tools/cython-mode.*
-		elisp-site-file-install "${FILESDIR}/${SITEFILE}"
-	fi
-}
-
-pkg_postinst() {
-	use emacs && elisp-site-regen
-}
-
-pkg_postrm() {
-	use emacs && elisp-site-regen
-}
diff --git a/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-0.29.34.ebuild b/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-0.29.34.ebuild
index 72900e9aaf..d1e81c489d 100644
--- a/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-0.29.34.ebuild
+++ b/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-0.29.34.ebuild
@@ -23,7 +23,7 @@ SRC_URI="
 
 LICENSE="Apache-2.0"
 SLOT="0"
-KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~x64-cygwin ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris ~x86-solaris"
+KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 sparc x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
 IUSE="emacs test"
 RESTRICT="!test? ( test )"
 
diff --git a/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-0.29.33-r1.ebuild b/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-0.29.35.ebuild
similarity index 76%
rename from sdk_container/src/third_party/portage-stable/dev-python/cython/cython-0.29.33-r1.ebuild
rename to sdk_container/src/third_party/portage-stable/dev-python/cython/cython-0.29.35.ebuild
index 1c030e3fca..98a01242a0 100644
--- a/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-0.29.33-r1.ebuild
+++ b/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-0.29.35.ebuild
@@ -3,11 +3,14 @@
 
 EAPI=8
 
+DISTUTILS_EXT=1
 DISTUTILS_USE_PEP517=setuptools
-PYTHON_COMPAT=( python3_{9..11} pypy3 )
+PYTHON_TESTED=( python3_{10..11} )
+# 3.12 not tested yet for https://github.com/cython/cython/issues/5285.
+PYTHON_COMPAT=( "${PYTHON_TESTED[@]}" python3_12 pypy3 )
 PYTHON_REQ_USE="threads(+)"
 
-inherit distutils-r1 toolchain-funcs elisp-common
+inherit distutils-r1 multiprocessing toolchain-funcs elisp-common
 
 DESCRIPTION="A Python to C compiler"
 HOMEPAGE="
@@ -22,7 +25,7 @@ SRC_URI="
 
 LICENSE="Apache-2.0"
 SLOT="0"
-KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~x64-cygwin ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris ~x86-solaris"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
 IUSE="emacs test"
 RESTRICT="!test? ( test )"
 
@@ -34,7 +37,7 @@ BDEPEND="
 	test? (
 		$(python_gen_cond_dep '
 			dev-python/numpy[${PYTHON_USEDEP}]
-		' python3_{8..10})
+		' python3_{10..11})
 	)
 "
 
@@ -60,7 +63,7 @@ python_compile_all() {
 }
 
 python_test() {
-	if has "${EPYTHON}" pypy3 python3.11; then
+	if ! has "${EPYTHON/./_}" "${PYTHON_TESTED[@]}"; then
 		einfo "Skipping tests on ${EPYTHON} (xfail)"
 		return
 	fi
@@ -68,7 +71,7 @@ python_test() {
 	tc-export CC
 	# https://github.com/cython/cython/issues/1911
 	local -x CFLAGS="${CFLAGS} -fno-strict-overflow"
-	"${PYTHON}" runtests.py -vv --work-dir "${BUILD_DIR}"/tests ||
+	"${PYTHON}" runtests.py -vv -j "$(makeopts_jobs)" --work-dir "${BUILD_DIR}"/tests ||
 		die "Tests fail with ${EPYTHON}"
 }
 
diff --git a/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-3.0.0_beta2.ebuild b/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-3.0.0_beta3-r1.ebuild
similarity index 73%
rename from sdk_container/src/third_party/portage-stable/dev-python/cython/cython-3.0.0_beta2.ebuild
rename to sdk_container/src/third_party/portage-stable/dev-python/cython/cython-3.0.0_beta3-r1.ebuild
index a662c30596..ca84314058 100644
--- a/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-3.0.0_beta2.ebuild
+++ b/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-3.0.0_beta3-r1.ebuild
@@ -5,10 +5,11 @@ EAPI=8
 
 DISTUTILS_EXT=1
 DISTUTILS_USE_PEP517=setuptools
-PYTHON_COMPAT=( python3_{9..11} pypy3 )
+PYTHON_TESTED=( python3_{10..11} )
+PYTHON_COMPAT=( "${PYTHON_TESTED[@]}" python3_12 pypy3 )
 PYTHON_REQ_USE="threads(+)"
 
-inherit distutils-r1 toolchain-funcs
+inherit distutils-r1 multiprocessing toolchain-funcs
 
 MY_P=${P/_beta/b}
 DESCRIPTION="A Python to C compiler"
@@ -25,7 +26,7 @@ S=${WORKDIR}/${MY_P}
 
 LICENSE="Apache-2.0"
 SLOT="0"
-KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~x64-cygwin ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris ~x86-solaris"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
 IUSE="test"
 RESTRICT="!test? ( test )"
 
@@ -34,7 +35,7 @@ BDEPEND="
 	test? (
 		$(python_gen_cond_dep '
 			dev-python/numpy[${PYTHON_USEDEP}]
-		' python3_{8..10})
+		' python3_{10..11})
 	)
 "
 
@@ -42,6 +43,8 @@ PATCHES=(
 	"${FILESDIR}/${PN}-0.29.22-spawn-multiprocessing.patch"
 	"${FILESDIR}/${PN}-0.29.23-test_exceptions-py310.patch"
 	"${FILESDIR}/${PN}-0.29.23-pythran-parallel-install.patch"
+	# backport upstream fix e.g. for dev-python/pysimdjson on py3.12
+	"${FILESDIR}/${P}-py312-long.patch"
 )
 
 distutils_enable_sphinx docs \
@@ -57,7 +60,7 @@ python_compile() {
 }
 
 python_test() {
-	if has "${EPYTHON}" pypy3 python3.11; then
+	if ! has "${EPYTHON/./_}" "${PYTHON_TESTED[@]}"; then
 		einfo "Skipping tests on ${EPYTHON} (xfail)"
 		return
 	fi
@@ -65,7 +68,7 @@ python_test() {
 	tc-export CC
 	# https://github.com/cython/cython/issues/1911
 	local -x CFLAGS="${CFLAGS} -fno-strict-overflow"
-	"${PYTHON}" runtests.py -vv --work-dir "${BUILD_DIR}"/tests ||
+	"${PYTHON}" runtests.py -vv -j "$(makeopts_jobs)" --work-dir "${BUILD_DIR}"/tests ||
 		die "Tests fail with ${EPYTHON}"
 }
 
diff --git a/sdk_container/src/third_party/portage-stable/dev-python/cython/files/cython-3.0.0_beta3-py312-long.patch b/sdk_container/src/third_party/portage-stable/dev-python/cython/files/cython-3.0.0_beta3-py312-long.patch
new file mode 100644
index 0000000000..fb849eca86
--- /dev/null
+++ b/sdk_container/src/third_party/portage-stable/dev-python/cython/files/cython-3.0.0_beta3-py312-long.patch
@@ -0,0 +1,28 @@
+From d82e4e34582e908d315b912a60d81d5759850df5 Mon Sep 17 00:00:00 2001
+From: Stefan Behnel <stefan_ml@behnel.de>
+Date: Mon, 29 May 2023 21:58:15 +0200
+Subject: [PATCH] Fix the argument type passed into the new
+ "PyUnstable_Long_Compact*()" C-API functions in CPython 3.12.
+
+---
+ Cython/Utility/TypeConversion.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/Cython/Utility/TypeConversion.c b/Cython/Utility/TypeConversion.c
+index efc5c1373..09e87d81c 100644
+--- a/Cython/Utility/TypeConversion.c
++++ b/Cython/Utility/TypeConversion.c
+@@ -149,8 +149,8 @@ static CYTHON_INLINE Py_hash_t __Pyx_PyIndex_AsHash_t(PyObject*);
+         ((1 - (Py_ssize_t) __Pyx_PyLong_Sign(x)) * __Pyx_PyLong_DigitCount(x))
+ 
+   #if defined(PyUnstable_Long_IsCompact) && defined(PyUnstable_Long_CompactValue)
+-    #define __Pyx_PyLong_IsCompact(x)     PyUnstable_Long_IsCompact(x)
+-    #define __Pyx_PyLong_CompactValue(x)  PyUnstable_Long_CompactValue(x)
++    #define __Pyx_PyLong_IsCompact(x)     PyUnstable_Long_IsCompact((PyLongObject*) x)
++    #define __Pyx_PyLong_CompactValue(x)  PyUnstable_Long_CompactValue((PyLongObject*) x)
+   #else
+     #define __Pyx_PyLong_IsCompact(x)     (((PyLongObject*)x)->long_value.lv_tag < (2 << _PyLong_NON_SIZE_BITS))
+     #define __Pyx_PyLong_CompactValue(x)  ((1 - (Py_ssize_t) __Pyx_PyLong_Sign(x)) * (Py_ssize_t) __Pyx_PyLong_Digits(x)[0])
+-- 
+2.41.0
+