diff --git a/sdk_container/src/third_party/portage-stable/dev-libs/mpc/Manifest b/sdk_container/src/third_party/portage-stable/dev-libs/mpc/Manifest
index 0b2e2d8ce9..c9f2a69373 100644
--- a/sdk_container/src/third_party/portage-stable/dev-libs/mpc/Manifest
+++ b/sdk_container/src/third_party/portage-stable/dev-libs/mpc/Manifest
@@ -1 +1,2 @@
 DIST mpc-1.3.1.tar.gz 773573 BLAKE2B 76434e6f8830af3571836d51576bfebbc9701e9bbb5c4686f134081cd96cd90ae02f7ff42bf9e3957c7a7ba92b6b2d9cdabe18f0269271147521cd7f6a2d551c SHA512 4bab4ef6076f8c5dfdc99d810b51108ced61ea2942ba0c1c932d624360a5473df20d32b300fc76f2ba4aa2a97e1f275c9fd494a1ba9f07c4cb2ad7ceaeb1ae97
+DIST mpc-1.3.1.tar.gz.sig 119 BLAKE2B ec48cf3a37c3b4a923b354d5e321d73561361586dd6dee2ccfaf7e05021ec43dd34e6045dec475a47fae36cf5b36d9b3901ba677cb1bfc9016c3f28392c46099 SHA512 5c2e6cccf9c5e6a401095e4abf4c4c8eb44ae4cd81debaa94da817f68f7ef39a732e969d5c264912b0a44fd2a0575e2f903d71def38cb95fa073851e3a537e5c
diff --git a/sdk_container/src/third_party/portage-stable/dev-libs/mpc/mpc-1.3.1.ebuild b/sdk_container/src/third_party/portage-stable/dev-libs/mpc/mpc-1.3.1.ebuild
index 51a838c6ba..c1a5641407 100644
--- a/sdk_container/src/third_party/portage-stable/dev-libs/mpc/mpc-1.3.1.ebuild
+++ b/sdk_container/src/third_party/portage-stable/dev-libs/mpc/mpc-1.3.1.ebuild
@@ -1,9 +1,10 @@
-# Copyright 1999-2025 Gentoo Authors
+# Copyright 1999-2026 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
 
-inherit multilib-minimal
+VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/mpc.asc
+inherit multilib-minimal verify-sig
 
 DESCRIPTION="A library for multiprecision complex arithmetic with exact rounding"
 HOMEPAGE="https://www.multiprecision.org/mpc/ https://gitlab.inria.fr/mpc/mpc"
@@ -12,9 +13,12 @@ if [[ ${PV} == *_rc* ]] ; then
 	SRC_URI="https://www.multiprecision.org/downloads/${P/_}.tar.gz"
 	S="${WORKDIR}"/${PN}-$(ver_cut 1-3)
 else
-	SRC_URI="mirror://gnu/${PN}/${P}.tar.gz"
+	SRC_URI="
+		mirror://gnu/${PN}/${P}.tar.gz
+		verify-sig? ( mirror://gnu/${PN}/${P}.tar.gz.sig )
+	"
 
-	KEYWORDS="~alpha amd64 arm arm64 ~hppa ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 ~sparc x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+	KEYWORDS="~alpha amd64 arm arm64 ~hppa ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 ~sparc x86 ~arm64-macos ~x64-macos ~x64-solaris"
 fi
 
 LICENSE="LGPL-3+ FDL-1.3+"
@@ -26,6 +30,9 @@ DEPEND="
 	>=dev-libs/mpfr-4.1.0:=[${MULTILIB_USEDEP},static-libs?]
 "
 RDEPEND="${DEPEND}"
+BDEPEND="
+	verify-sig? ( sec-keys/openpgp-keys-mpc )
+"
 
 multilib_src_configure() {
 	ECONF_SOURCE="${S}" econf $(use_enable static-libs static)