diff --git a/dev-libs/unordered_dense/Manifest b/dev-libs/unordered_dense/Manifest
index efa8851a45..0b55e26516 100644
--- a/dev-libs/unordered_dense/Manifest
+++ b/dev-libs/unordered_dense/Manifest
@@ -1,2 +1,3 @@
 DIST unordered_dense-4.0.1.tar.gz 364688 BLAKE2B 190ecdf53c2e476702e362e474dc2f692fd6dd6b15e9313a59710dce3f520aa3f53304e52a00f5d81194a6dbff7346c145be3ab0b083246df018e1bbedadb736 SHA512 105eb88deeb89c9424973d2b5425a6e176f3f66a45f11cf6ed520cce177918cd5345e840d10561f6f790b6cc11b7b6e1357bd2fc4d199254a360de88ce553fe0
 DIST unordered_dense-4.4.0.tar.gz 900081 BLAKE2B cffac8fa38ec4779a5d05e212d185a54e0d3014c894efaf0bd76bdc8408fed6b9cb8e01b0d2fd7cefbe1abe34cdff00c7f1df1f5627379afa1e2f830f2527c83 SHA512 82724dd3651f520a240b131fa7cac209d844b9f3a54ea36c8cbb125cb42fdbf5f38d96935f2999e5bf04c447b2b9fde4ebc740decfd7d3d4b7d45177d4f26b58
+DIST unordered_dense-4.8.1.tar.gz 915251 BLAKE2B 6830cfc922fcd681118a5eb4900cc3c94f28505999e39392fa69ae77e03f381155c28a83c7bd04d2191693fc8b81e29c313ab6c0a2d1887ed6849dcff7dda78f SHA512 b98b5d4d96f8e0081b184d6c4c1181fae4e41723b54bed4296717d7f417348b48fad0bbcc664cac142b8c8a47e95aa57c1eb1cf6caa855fd782fad3e3ab99e5e
diff --git a/dev-libs/unordered_dense/unordered_dense-4.8.1.ebuild b/dev-libs/unordered_dense/unordered_dense-4.8.1.ebuild
new file mode 100644
index 0000000000..48a540b3b0
--- /dev/null
+++ b/dev-libs/unordered_dense/unordered_dense-4.8.1.ebuild
@@ -0,0 +1,30 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit cmake
+
+DESCRIPTION="A fast and densely stored hashmap and hashset"
+HOMEPAGE="https://github.com/martinus/unordered_dense"
+
+if [[ "${PV}" == "9999" ]] ; then
+	inherit git-r3
+	EGIT_REPO_URI="https://github.com/martinus/${PN}.git"
+else
+	SRC_URI="https://github.com/martinus/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+	KEYWORDS="~amd64 ~arm64 ~ppc64 ~riscv ~x86"
+	S="${WORKDIR}/${P}"
+fi
+
+LICENSE="MIT"
+SLOT="0"
+RESTRICT="test"
+
+src_configure() {
+	local mycmakeargs=(
+		-D CMAKE_INSTALL_LIBDIR="${EPREFIX}/usr/$(get_libdir)"
+		-D BUILD_SHARED_LIBS=ON
+	)
+	cmake_src_configure
+}
diff --git a/dev-libs/unordered_dense/unordered_dense-9999.ebuild b/dev-libs/unordered_dense/unordered_dense-9999.ebuild
index cedd21e86d..48a540b3b0 100644
--- a/dev-libs/unordered_dense/unordered_dense-9999.ebuild
+++ b/dev-libs/unordered_dense/unordered_dense-9999.ebuild
@@ -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
 
 EAPI=8
@@ -13,7 +13,7 @@ if [[ "${PV}" == "9999" ]] ; then
 	EGIT_REPO_URI="https://github.com/martinus/${PN}.git"
 else
 	SRC_URI="https://github.com/martinus/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
-	KEYWORDS="~amd64 ~ppc64 ~arm64 ~riscv ~x86"
+	KEYWORDS="~amd64 ~arm64 ~ppc64 ~riscv ~x86"
 	S="${WORKDIR}/${P}"
 fi