diff --git a/dev-lang/go/Manifest b/dev-lang/go/Manifest
new file mode 100644
index 0000000..82fcb47
--- /dev/null
+++ b/dev-lang/go/Manifest
@@ -0,0 +1,3 @@
+AUX go-sets.conf 313 BLAKE2B 03e94776e317d34b72bfb8385b8b0dfa6a599a6086e4d0c9214e7b49293768947c21d9afb323ffcc7fd85ba0af72d9cb243dbb571eee9eb81de9400fd5f5e79c SHA512 7d01b98bc8d1b609183682dd942bd4c9fa757a98243c7de3cf6c497c7bc20b8cdbe59dd669ce4bb11f914a0e9b6d100e65cea2dffd99f38be50b18e0ecf66315
+DIST go1.21.0.src.tar.gz 26942359 BLAKE2B ba04a8b20d4ea35cd6f32e5975a347c9359b9e9d2bf77196afb50b6f527d69623cdc7900c74abe5315e53589e0be20aef5eb4a5faa0efa836ed22db12d041203 SHA512 da629fee156de6abbc5195f746e2fe4172a31b97eccd3871283c60452e81ac740533cc28ca68762ebc0ce48fb791dc527d3b7ebe7e1aee0f0b68868de736ed42
+EBUILD go-1.21.0.ebuild 5387 BLAKE2B dd5ab008bfa013637657123ff661eb49013aef219a0ea4d2ae1ab004a880b788f3a70c9f5ed8bb61dc19b6c2742452beff3148c6dad1fb1514ddac45cc6c4ca5 SHA512 76445badfa0da69c9c635ca6d3ce1a72cc830c2e8aa2903f31a6f75ddad412c799097c0b976f237aa3d480d23f9c5aa39a4ad8a696ee9397ec68eec8eb9111e7
diff --git a/dev-lang/go/files/go-sets.conf b/dev-lang/go/files/go-sets.conf
new file mode 100644
index 0000000..01ad4a8
--- /dev/null
+++ b/dev-lang/go/files/go-sets.conf
@@ -0,0 +1,7 @@
+# Installed packages that inherit from known Go related eclasses.
+# This is useful after a dev-lang/go version change to rebuild all
+# software written in Go.
+[golang-rebuild]
+class = portage.sets.dbapi.VariableSet
+variable = INHERITED
+includes = golang-base golang-build golang-vcs golang-vcs-snapshot go-module
diff --git a/dev-lang/go/go-1.21.0.ebuild b/dev-lang/go/go-1.21.0.ebuild
new file mode 100644
index 0000000..908e325
--- /dev/null
+++ b/dev-lang/go/go-1.21.0.ebuild
@@ -0,0 +1,210 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+export CBUILD=${CBUILD:-${CHOST}}
+export CTARGET=${CTARGET:-${CHOST}}
+
+# See "Bootstrap" in release notes
+GO_BOOTSTRAP_MIN=1.17.13
+MY_PV=${PV/_/}
+
+inherit toolchain-funcs
+
+case ${PV}  in
+*9999*)
+	EGIT_REPO_URI="https://github.com/golang/go.git"
+	inherit git-r3
+	;;
+*)
+	SRC_URI="https://storage.googleapis.com/golang/go${MY_PV}.src.tar.gz "
+	S="${WORKDIR}"/go
+	case ${PV} in
+	*_beta*|*_rc*) ;;
+	*)
+		KEYWORDS="-* amd64 arm ~arm64 ~loong ~mips ppc64 ~riscv ~s390 ~x86 ~amd64-linux ~x86-linux ~x64-macos ~x64-solaris"
+		;;
+	esac
+esac
+
+DESCRIPTION="A concurrent garbage collected and typesafe programming language"
+HOMEPAGE="https://go.dev"
+
+LICENSE="BSD"
+SLOT="0/${PV}"
+IUSE="abi_mips_o32 abi_mips_n64 cpu_flags_x86_sse2"
+
+RDEPEND="
+arm? ( sys-devel/binutils[gold] )
+arm64? ( sys-devel/binutils[gold] )"
+BDEPEND="|| (
+		>=dev-lang/go-${GO_BOOTSTRAP_MIN}
+		>=dev-lang/go-bootstrap-${GO_BOOTSTRAP_MIN} )"
+
+# the *.syso files have writable/executable stacks
+QA_EXECSTACK='*.syso'
+
+# Do not complain about CFLAGS, etc, since Go doesn't use them.
+QA_FLAGS_IGNORED='.*'
+
+# The tools in /usr/lib/go should not cause the multilib-strict check to fail.
+QA_MULTILIB_PATHS="usr/lib/go/pkg/tool/.*/.*"
+
+# This package triggers "unrecognized elf file(s)" notices on riscv.
+# https://bugs.gentoo.org/794046
+QA_PREBUILT='.*'
+
+# Do not strip this package. Stripping is unsupported upstream and may
+# fail.
+RESTRICT+=" strip"
+
+DOCS=(
+	CONTRIBUTING.md
+	PATENTS
+	README.md
+	SECURITY.md
+)
+
+go_arch() {
+	# By chance most portage arch names match Go
+	local tc_arch=$(tc-arch $@)
+	case "${tc_arch}" in
+		x86)	echo 386;;
+		x64-*)	echo amd64;;
+		loong)	echo loong64;;
+		mips) if use abi_mips_o32; then
+				[[ $(tc-endian $@) = big ]] && echo mips || echo mipsle
+			elif use abi_mips_n64; then
+				[[ $(tc-endian $@) = big ]] && echo mips64 || echo mips64le
+			fi ;;
+		ppc64) [[ $(tc-endian $@) = big ]] && echo ppc64 || echo ppc64le ;;
+		riscv) echo riscv64 ;;
+		s390) echo s390x ;;
+		*)		echo "${tc_arch}";;
+	esac
+}
+
+go_arm() {
+	case "${1:-${CHOST}}" in
+		armv5*)	echo 5;;
+		armv6*)	echo 6;;
+		armv7*)	echo 7;;
+		*)
+			die "unknown GOARM for ${1:-${CHOST}}"
+			;;
+	esac
+}
+
+go_os() {
+	case "${1:-${CHOST}}" in
+		*-linux*)	echo linux;;
+		*-darwin*)	echo darwin;;
+		*-freebsd*)	echo freebsd;;
+		*-netbsd*)	echo netbsd;;
+		*-openbsd*)	echo openbsd;;
+		*-solaris*)	echo solaris;;
+		*-cygwin*|*-interix*|*-winnt*)
+			echo windows
+			;;
+		*)
+			die "unknown GOOS for ${1:-${CHOST}}"
+			;;
+	esac
+}
+
+go_tuple() {
+	echo "$(go_os $@)_$(go_arch $@)"
+}
+
+go_cross_compile() {
+	[[ $(go_tuple ${CBUILD}) != $(go_tuple) ]]
+}
+
+src_compile() {
+	if has_version -b ">=dev-lang/go-${GO_BOOTSTRAP_MIN}"; then
+		export GOROOT_BOOTSTRAP="${BROOT}/usr/lib/go"
+	elif has_version -b ">=dev-lang/go-bootstrap-${GO_BOOTSTRAP_MIN}"; then
+		export GOROOT_BOOTSTRAP="${BROOT}/usr/lib/go-bootstrap"
+	else
+		eerror "Go cannot be built without go or go-bootstrap installed"
+		die "Should not be here, please report a bug"
+	fi
+
+	export GOROOT_FINAL="${EPREFIX}"/usr/lib/go
+	export GOROOT="${PWD}"
+	export GOBIN="${GOROOT}/bin"
+
+	# Go's build script does not use BUILD/HOST/TARGET consistently. :(
+	export GOHOSTARCH=$(go_arch ${CBUILD})
+	export GOHOSTOS=$(go_os ${CBUILD})
+	export CC=$(tc-getBUILD_CC)
+
+	export GOARCH=$(go_arch)
+	export GOOS=$(go_os)
+	export CC_FOR_TARGET=$(tc-getCC)
+	export CXX_FOR_TARGET=$(tc-getCXX)
+	use arm && export GOARM=$(go_arm)
+	use x86 && export GO386=$(usex cpu_flags_x86_sse2 '' 'softfloat')
+
+	cd src
+	bash -x ./make.bash || die "build failed"
+}
+
+src_test() {
+	go_cross_compile && return 0
+
+	cd src
+
+	# https://github.com/golang/go/issues/42005
+	rm cmd/link/internal/ld/fallocate_test.go || true
+
+	PATH="${GOBIN}:${PATH}" \
+	./run.bash -no-rebuild || die "tests failed"
+	cd ..
+	rm -fr pkg/*_race || die
+	rm -fr pkg/obj/go-build || die
+}
+
+src_install() {
+	# There is a known issue which requires the source tree to be installed [1].
+	# Once this is fixed, we can consider using the doc use flag to control
+	# installing the doc and src directories.
+	# The use of cp is deliberate in order to retain permissions
+	# [1] https://golang.org/issue/2775
+	dodir /usr/lib/go
+	cp -R api bin doc lib pkg misc src test "${ED}"/usr/lib/go
+	einstalldocs
+
+	# testdata directories are not needed on the installed system
+	rm -fr $(find "${ED}"/usr/lib/go -iname testdata -type d -print)
+
+	local bin_path
+	if go_cross_compile; then
+		bin_path="bin/$(go_tuple)"
+	else
+		bin_path=bin
+	fi
+	local f x
+	for x in ${bin_path}/*; do
+		f=${x##*/}
+		dosym ../lib/go/${bin_path}/${f} /usr/bin/${f}
+	done
+
+	# install the @golang-rebuild set for Portage
+	insinto /usr/share/portage/config/sets
+	newins "${FILESDIR}"/go-sets.conf go.conf
+}
+
+pkg_postinst() {
+	[[ -z ${REPLACING_VERSIONS} ]] && return
+	elog "After ${CATEGORY}/${PN} is updated it is recommended to rebuild"
+	elog "all packages compiled with previous versions of ${CATEGORY}/${PN}"
+	elog "due to the static linking nature of go."
+	elog "If this is not done, the packages compiled with the older"
+	elog "version of the compiler will not be updated until they are"
+	elog "updated individually, which could mean they will have"
+	elog "vulnerabilities."
+	elog "Run 'emerge @golang-rebuild' to rebuild all 'go' packages"
+	elog "See https://bugs.gentoo.org/752153 for more info"
+}