diff --git a/sdk_container/src/third_party/portage-stable/eclass/multibuild.eclass b/sdk_container/src/third_party/portage-stable/eclass/multibuild.eclass
index 652a938d56..cb63fd4d79 100644
--- a/sdk_container/src/third_party/portage-stable/eclass/multibuild.eclass
+++ b/sdk_container/src/third_party/portage-stable/eclass/multibuild.eclass
@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: multibuild.eclass
@@ -6,7 +6,7 @@
 # Michał Górny <mgorny@gentoo.org>
 # @AUTHOR:
 # Author: Michał Górny <mgorny@gentoo.org>
-# @SUPPORTED_EAPIS: 7 8
+# @SUPPORTED_EAPIS: 7 8 9
 # @BLURB: A generic eclass for building multiple variants of packages.
 # @DESCRIPTION:
 # The multibuild eclass aims to provide a generic framework for building
@@ -17,7 +17,7 @@ if [[ -z ${_MULTIBUILD_ECLASS} ]]; then
 _MULTIBUILD_ECLASS=1
 
 case ${EAPI} in
-	7|8)
+	7|8|9)
 		# backwards compatibility for run_in_build_dir
 		inherit out-of-source-utils
 		;;