diff --git a/dev-util/mock/Manifest b/dev-util/mock/Manifest
index b3c05f9a7b..8e119dce83 100644
--- a/dev-util/mock/Manifest
+++ b/dev-util/mock/Manifest
@@ -1 +1,2 @@
 DIST mock-6.2.tar.gz 198222 BLAKE2B 2b20e84e994e80e907a8e13752ad4813017e3f025486287cd69de261e4af689561968e5b5031fcfa3f138e83d35150f3418685a1e4bd64ebab3ea657e2890444 SHA512 9d272d22d87ab37973f85d8e1d4bb090144171b695569b0bebabb60df1a7b6a8191dc434727dd7a4bb0ca78095c9c43d79373ad58eea3b15996227e4c608cb0a
+DIST mock-6.3.tar.gz 198503 BLAKE2B 4d901871986758b778882710a105d564e266d7c0f276e4ec58cc25e9c1f2ad78dac795a790ce9d0aa7232880c1a51683e95ac58d0c80d8ec0683cecdb40ed350 SHA512 ebfaca2d8fd75c684f1d62e36118c0708a80bcfb319a4e0d1c421734bec2df18ebc37e93ef9fdf1bb3488fddc6b632b91acc26f7890ff455ff0b0145eaa4b879
diff --git a/dev-util/mock/mock-6.3.ebuild b/dev-util/mock/mock-6.3.ebuild
new file mode 100644
index 0000000000..673b895927
--- /dev/null
+++ b/dev-util/mock/mock-6.3.ebuild
@@ -0,0 +1,102 @@
+# Copyright 2023-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{11..13} )
+
+inherit bash-completion-r1 optfeature python-single-r1
+
+DESCRIPTION="Simple chroot build environment manager for building RPMs"
+HOMEPAGE="
+	https://rpm-software-management.github.io/mock/
+	https://github.com/rpm-software-management/mock/
+"
+SRC_URI="https://github.com/rpm-software-management/mock/releases/download/${P}-1/${P}.tar.gz"
+
+LICENSE="GPL-2+"
+SLOT="0"
+KEYWORDS="~amd64"
+IUSE="test"
+REQUIRED_USE="${PYTHON_REQUIRED_USE}"
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	${PYTHON_DEPS}
+	$(python_gen_cond_dep '
+		app-arch/rpm[caps,python,${PYTHON_SINGLE_USEDEP}]
+		dev-python/backoff[${PYTHON_USEDEP}]
+		dev-python/distro[${PYTHON_USEDEP}]
+		dev-python/pyroute2[${PYTHON_USEDEP}]
+		dev-python/requests[${PYTHON_USEDEP}]
+		dev-python/rpmautospec-core[${PYTHON_USEDEP}]
+		dev-python/templated-dictionary[${PYTHON_USEDEP}]
+	')
+	acct-group/mock
+	|| ( app-containers/podman sys-apps/dnf5 )
+	dev-util/distribution-gpg-keys
+	dev-util/mock-core-configs
+"
+BDEPEND="
+	${PYTHON_DEPS}
+	$(python_gen_cond_dep 'dev-python/argparse-manpage[${PYTHON_USEDEP}]')
+	test? ( $(python_gen_cond_dep '
+		dev-python/jsonschema[${PYTHON_USEDEP}]
+		dev-python/pytest[${PYTHON_USEDEP}]
+	') )
+"
+
+src_prepare() {
+	default
+
+	sed -i -e "s|^VERSION\s*=.*|VERSION=\"${PV}\"|" \
+		-e "s|^SYSCONFDIR\s*=.*|SYSCONFDIR=\"${EPREFIX}/etc\"|" \
+		-e "s|^PYTHONDIR\s*=.*|PYTHONDIR=\"$(python_get_sitedir)\"|" \
+		-e "s|^PKGPYTHONDIR\s*=.*|PKGPYTHONDIR=\"$(python_get_sitedir)/mockbuild\"|" \
+		py/mockbuild/constants.py py/mock-parse-buildlog.py || die
+
+	sed -i -e "s|^_MOCK_NVR = None$|_MOCK_NVR = \"${P}-1\"|" py/mock.py || die
+	sed -i -e "s|@VERSION@|${PV}|" docs/mock.1 docs/mock-parse-buildlog.1 || die
+
+	sed -i -e 's|"/bin/free"|"/usr/bin/free"|' py/mockbuild/plugins/hw_info.py || die
+
+	# bug #928266: remove unnecessary completion target for us
+	sed -i -e "s/ mock.py//" -e "s/ mock-parse-buildlog.py//" etc/bash_completion.d/mock || die
+}
+
+src_compile() {
+	argparse-manpage --pyfile py/mock-hermetic-repo.py --function _argparser > mock-hermetic-repo.1 || die
+}
+
+src_install() {
+	python_domodule py/mockbuild
+	python_newscript py/mock.py mock
+	python_newscript py/mock-hermetic-repo.py mock-hermetic-repo
+	python_newscript py/mock-parse-buildlog.py mock-parse-buildlog
+	dobin mockchain
+
+	dobashcomp etc/bash_completion.d/mock
+	bashcomp_alias mock mock-parse-buildlog
+	dodoc docs/site-defaults.cfg
+	doman docs/mock.1 docs/mock-parse-buildlog.1 mock-hermetic-repo.1
+
+	insinto /etc/mock
+	doins etc/mock/*
+	insinto /etc/pki/mock
+	doins etc/pki/*
+
+	diropts -m0775 -o root -g mock
+	keepdir /var/lib/mock
+}
+
+src_test() {
+	PYTHONPATH=py epytest tests
+}
+
+pkg_postinst() {
+	optfeature "chain mode support" app-arch/createrepo_c
+	optfeature "pigz in root_cache plugin" app-arch/pigz
+	optfeature "nspawn instead of chroot" sys-apps/systemd
+	optfeature "lvm_root plugin support" sys-fs/lvm2
+	optfeature "procenv plugin support" sys-process/procenv
+}