diff --git a/net-p2p/transmission/Manifest b/net-p2p/transmission/Manifest
index a0558a31ee77e..0d62d8ff487a3 100644
--- a/net-p2p/transmission/Manifest
+++ b/net-p2p/transmission/Manifest
@@ -1 +1,2 @@
+DIST transmission-4.0.5.tar.xz 9745756 BLAKE2B 60caa3bc615137b225d3ac3f25daa352c6960fcc848c91e5ea45488ae109d93b53e314e4683bd7c4ef3f9b2f364d796b6c5bb014ca647d3f44fb5c9df9f8c997 SHA512 9d3df965929ba18aa8186f89060aeacc8ead3df4a5acdc74a005dc62deadc5fa239af99c49ca2477cc5c1adfcd834481105f1dbc94e0efe210e9e6680bfec124
 DIST transmission-4.0.6-gentoo.tar.xz 9657544 BLAKE2B 9406b01aeea44ba49339cb016ae92840e25e246fd3c8542ae623c89912f4df467abb676193d85b5bb16fddba41c8bc9924e5d17bbe0a475cadfd7ee56173f2c3 SHA512 5eec412df7fe0dcd0c232914783a0289bc30865d4490a939259e6f36367a37c6bc37c4bcf59cfe2695699c5ea6dd1cf4a830e2311fb45178372a9e9d0c70095c
diff --git a/net-p2p/transmission/transmission-4.0.5-r2.ebuild b/net-p2p/transmission/transmission-4.0.5-r2.ebuild
new file mode 100644
index 0000000000000..816d7881dffc9
--- /dev/null
+++ b/net-p2p/transmission/transmission-4.0.5-r2.ebuild
@@ -0,0 +1,164 @@
+# Copyright 2006-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit cmake flag-o-matic tmpfiles systemd xdg-utils
+
+if [[ ${PV} == 9999 ]]; then
+	inherit git-r3
+	EGIT_REPO_URI="https://github.com/transmission/transmission"
+else
+	MY_PV="${PV/_beta/-beta.}"
+	MY_P="${PN}-${MY_PV}"
+	S="${WORKDIR}/${MY_P}"
+	SRC_URI="https://github.com/transmission/transmission/releases/download/${MY_PV}/${MY_P}.tar.xz"
+	KEYWORDS="amd64 ~arm ~arm64 ppc ppc64 ~riscv x86"
+fi
+
+DESCRIPTION="A fast, easy, and free BitTorrent client"
+HOMEPAGE="https://transmissionbt.com/"
+
+# web/LICENSE is always GPL-2 whereas COPYING allows either GPL-2 or GPL-3 for the rest
+# transmission in licenses/ is for mentioning OpenSSL linking exception
+# MIT is in several libtransmission/ headers
+LICENSE="|| ( GPL-2 GPL-3 Transmission-OpenSSL-exception ) GPL-2 MIT"
+SLOT="0"
+IUSE="appindicator cli debug gtk nls mbedtls qt6 systemd test"
+RESTRICT="!test? ( test )"
+
+ACCT_DEPEND="
+	acct-group/transmission
+	acct-user/transmission
+"
+BDEPEND="
+	virtual/pkgconfig
+	nls? (
+		gtk? ( sys-devel/gettext )
+	)
+	qt6? ( dev-qt/qttools:6[linguist] )
+"
+COMMON_DEPEND="
+	app-arch/libdeflate:=[gzip(+)]
+	>=dev-libs/libevent-2.1.0:=[threads(+)]
+	!mbedtls? ( dev-libs/openssl:0= )
+	mbedtls? ( net-libs/mbedtls:0= )
+	net-libs/libnatpmp
+	>=net-libs/libpsl-0.21.1
+	>=net-libs/miniupnpc-1.7:=
+	>=net-misc/curl-7.28.0[ssl]
+	sys-libs/zlib:=
+	nls? ( virtual/libintl )
+	gtk? (
+		>=dev-cpp/gtkmm-4.11.1:4.0
+		>=dev-cpp/glibmm-2.60.0:2.68
+		appindicator? ( dev-libs/libayatana-appindicator )
+	)
+	qt6? (
+		dev-qt/qtbase:6[dbus,gui,network,widgets]
+		dev-qt/qtsvg:6
+	)
+	systemd? ( >=sys-apps/systemd-209:= )
+"
+DEPEND="${COMMON_DEPEND}
+	nls? ( virtual/libintl )
+"
+RDEPEND="${COMMON_DEPEND}
+	${ACCT_DEPEND}
+"
+
+PATCHES=(
+	"${FILESDIR}/transmission-4.0.6-miniupnpc-2.2.8.patch"
+)
+
+src_prepare() {
+	# Remove files which trigger <cmake-4 compat in cmake.eclass
+	rm -r third-party/{lib{deflate,event,natpmp,psl},miniupnpc} || die
+	rm third-party/utfcpp/CMakeLists.txt || die
+	rm third-party/utfcpp/extern/ftest/tests/CMakeLists.txt || die
+
+	cd third-party/dht || die
+	eapply "${FILESDIR}"/transmission-4.0.6-dht-cmake-4.patch
+	cd "${S}" || die
+
+	cmake_src_prepare
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DCMAKE_INSTALL_DOCDIR=share/doc/${PF}
+
+		-DENABLE_GTK=$(usex gtk ON OFF)
+		-DENABLE_MAC=OFF
+		-DREBUILD_WEB=OFF
+		-DENABLE_CLI=$(usex cli ON OFF)
+		-DENABLE_TESTS=$(usex test ON OFF)
+		-DENABLE_NLS=$(usex nls ON OFF)
+
+		-DRUN_CLANG_TIDY=OFF
+
+		-DUSE_GTK_VERSION=4
+		-DUSE_SYSTEM_EVENT2=ON
+		-DUSE_SYSTEM_DEFLATE=ON
+		-DUSE_SYSTEM_DHT=OFF
+		-DUSE_SYSTEM_MINIUPNPC=ON
+		-DUSE_SYSTEM_NATPMP=ON
+		-DUSE_SYSTEM_UTP=OFF
+		-DUSE_SYSTEM_B64=OFF
+		-DUSE_SYSTEM_PSL=ON
+
+		-DWITH_CRYPTO=$(usex mbedtls mbedtls openssl)
+		-DWITH_INOTIFY=ON
+		-DWITH_APPINDICATOR=$(usex appindicator ON OFF)
+		-DWITH_SYSTEMD=$(usex systemd ON OFF)
+	)
+
+	if use qt6; then
+		mycmakeargs+=( -DENABLE_QT=ON -DUSE_QT_VERSION=6 )
+	else
+		mycmakeargs+=( -DENABLE_QT=OFF )
+	fi
+
+	# Disable assertions by default, bug 893870.
+	use debug || append-cppflags -DNDEBUG
+
+	cmake_src_configure
+}
+
+src_test() {
+	# https://github.com/transmission/transmission/issues/4763
+	cmake_src_test -E DhtTest.usesBootstrapFile
+}
+
+src_install() {
+	cmake_src_install
+
+	newinitd "${FILESDIR}"/transmission-daemon.initd.10 transmission-daemon
+	newconfd "${FILESDIR}"/transmission-daemon.confd.4 transmission-daemon
+
+	if use systemd; then
+		# Service sets Type=notify
+		systemd_dounit daemon/transmission-daemon.service
+		systemd_install_serviced "${FILESDIR}"/transmission-daemon.service.conf
+	fi
+
+	insinto /usr/lib/sysctl.d
+	doins "${FILESDIR}"/60-transmission.conf
+
+	newtmpfiles "${FILESDIR}"/transmission-daemon.tmpfiles transmission-daemon.conf
+}
+
+pkg_postrm() {
+	if use gtk || use qt6; then
+		xdg_desktop_database_update
+		xdg_icon_cache_update
+	fi
+}
+
+pkg_postinst() {
+	if use gtk || use qt6; then
+		xdg_desktop_database_update
+		xdg_icon_cache_update
+	fi
+	tmpfiles_process transmission-daemon.conf
+}