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 bbe8cde036..49510167e8 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 +1,4 @@
 DIST cython-0.29.36.gh.tar.gz 2115333 BLAKE2B 6d43779c7222ff65d7de3a35ec18ef636480807d53480a8f94cc8c92d462fcc2f4d201a3bbf6e840a11fd33025e32c53f85626b05c131d10eed2859cdca7eb2d SHA512 a086fe1a11290cd3c870b891e61a0a0e2595bab9c26888024a758b6950c07059346d682fa9349e46c0af89805abbdd750059b3189960b8ce18007dfb5eb4391a
 DIST cython-3.0.2.gh.tar.gz 2744583 BLAKE2B f631891870a6ce24acf2bcde75ebcb9775cf0df7840fe9d7b138cfdea64d54e9253a53d35d892a9086f251c1294d9414eec8521218d031840a3cd06903fefb86 SHA512 f55be138efdca6ca61bd39c6f2fab736244328a170a6f6c9bda87036e022c846930b209e9e9101fad889cb179d6e60034ba6f299f14b3056536d46235b438eb7
 DIST cython-3.0.3.gh.tar.gz 2753188 BLAKE2B 0e6d40533f1cebf3c4217dc19aeebc2f873a8bacb94e68810e81d1c6d4cd75176de88516f2d82f43b36107656b6cd5e6990547e93bd8436b1aa93c73ccda6eaf SHA512 c27c16abaf0122ad61e0eeb92aa80a33fc491332b8ebec209cd1810d2b0e3bf14fe1e81838803b86f407520a6d6f7ab8b84d97e495e7d91fd6f7702a46980caa
+DIST cython-3.0.4.gh.tar.gz 2754689 BLAKE2B 5418b8c374565894deb07e7a3f2fe242e1ef43eed5d716cbd9c6b9fd3d62088d9982eb156c981fa9f6edcf42592f2249f9eb450d16ef908be464e357ee9bbea7 SHA512 bc87e38f9c188a5311f75f49ba4b9ec1ee0af00ff9ed655ca69972891f8b0801025265f8cad4521670088275c7da3d6136aeda7ebb6a33554f64cc7aef362c73
diff --git a/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-3.0.4.ebuild b/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-3.0.4.ebuild
new file mode 100644
index 0000000000..4223753eab
--- /dev/null
+++ b/sdk_container/src/third_party/portage-stable/dev-python/cython/cython-3.0.4.ebuild
@@ -0,0 +1,84 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DISTUTILS_EXT=1
+DISTUTILS_USE_PEP517=setuptools
+PYTHON_TESTED=( python3_{10..11} )
+PYTHON_COMPAT=( "${PYTHON_TESTED[@]}" python3_12 pypy3 )
+PYTHON_REQ_USE="threads(+)"
+
+inherit distutils-r1 multiprocessing toolchain-funcs
+
+MY_P=${P/_rc/rc}
+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/_rc/rc}.tar.gz
+		-> ${MY_P}.gh.tar.gz
+"
+S=${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 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+IUSE="test"
+RESTRICT="!test? ( test )"
+
+BDEPEND="
+	${RDEPEND}
+	test? (
+		$(python_gen_cond_dep '
+			dev-python/numpy[${PYTHON_USEDEP}]
+		' "${PYTHON_TESTED[@]}")
+	)
+"
+
+PATCHES=(
+	"${FILESDIR}/${PN}-0.29.22-spawn-multiprocessing.patch"
+	"${FILESDIR}/${PN}-0.29.23-test_exceptions-py310.patch"
+	"${FILESDIR}/${PN}-0.29.23-pythran-parallel-install.patch"
+)
+
+distutils_enable_sphinx docs \
+	dev-python/jinja \
+	dev-python/sphinx-issues \
+	dev-python/sphinx-tabs
+
+python_compile() {
+	# Python gets confused when it is in sys.path before build.
+	local -x PYTHONPATH=
+
+	distutils-r1_python_compile
+}
+
+python_test() {
+	if ! has "${EPYTHON/./_}" "${PYTHON_TESTED[@]}"; then
+		einfo "Skipping tests on ${EPYTHON} (xfail)"
+		return
+	fi
+
+	# Needed to avoid confusing cache tests
+	unset CYTHON_FORCE_REGEN
+
+	tc-export CC
+	# https://github.com/cython/cython/issues/1911
+	local -x CFLAGS="${CFLAGS} -fno-strict-overflow"
+	"${PYTHON}" runtests.py \
+		-vv \
+		-j "$(makeopts_jobs)" \
+		--work-dir "${BUILD_DIR}"/tests \
+		--no-examples \
+		--no-code-style \
+		|| die "Tests fail with ${EPYTHON}"
+}
+
+python_install_all() {
+	local DOCS=( CHANGES.rst README.rst ToDo.txt USAGE.txt )
+	distutils-r1_python_install_all
+}