diff --git a/dev-python/sphinx/files/sphinx-9.1.0-test.patch b/dev-python/sphinx/files/sphinx-9.1.0-test.patch
new file mode 100644
index 0000000000000..c7a0b98b75a35
--- /dev/null
+++ b/dev-python/sphinx/files/sphinx-9.1.0-test.patch
@@ -0,0 +1,48 @@
+From c01b0eb640bbc3dbd8141f3ea08df9edaa78ab2c Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?B=C3=A9n=C3=A9dikt=20Tran?=
+ <10796600+picnixz@users.noreply.github.com>
+Date: Sun, 7 Jun 2026 11:49:11 +0200
+Subject: [PATCH] Fix `test_search.py` with long-word splitting (#14474)
+
+---
+ tests/roots/test-search/index.rst | 1 +
+ tests/test_search.py              | 7 ++++++-
+ 2 files changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/tests/roots/test-search/index.rst b/tests/roots/test-search/index.rst
+index b38fd0271f6..c618633c345 100644
+--- a/tests/roots/test-search/index.rst
++++ b/tests/roots/test-search/index.rst
+@@ -19,6 +19,7 @@ International
+ 
+ .. tip::
+    :class: no-search
++
+    bat cat
+ 
+ .. toctree::
+diff --git a/tests/test_search.py b/tests/test_search.py
+index f94ae987bb7..64ec4670085 100644
+--- a/tests/test_search.py
++++ b/tests/test_search.py
+@@ -76,6 +76,11 @@ def is_registered_term(index: Any, keyword: str) -> bool:
+     return index['terms'].get(keyword, []) != []
+ 
+ 
++def is_registered_prefix(index: Any, prefix: str) -> bool:
++    terms = index['terms']
++    return any(k.startswith(prefix) and v != [] for k, v in terms.items())
++
++
+ FILE_CONTENTS = """\
+ section_title
+ =============
+@@ -144,7 +149,7 @@ def test_stemmer(app: SphinxTestApp) -> None:
+     searchindex = load_searchindex(app.outdir / 'searchindex.js')
+     print(searchindex)
+     assert is_registered_term(searchindex, 'findthisstemmedkey')
+-    assert is_registered_term(searchindex, 'intern')
++    assert is_registered_prefix(searchindex, 'intern')
+ 
+ 
+ @pytest.mark.sphinx('html', testroot='search')
diff --git a/dev-python/sphinx/sphinx-9.1.0-r1.ebuild b/dev-python/sphinx/sphinx-9.1.0-r1.ebuild
new file mode 100644
index 0000000000000..b3995e87bd0df
--- /dev/null
+++ b/dev-python/sphinx/sphinx-9.1.0-r1.ebuild
@@ -0,0 +1,109 @@
+# Copyright 1999-2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DISTUTILS_USE_PEP517=flit
+PYTHON_COMPAT=( python3_{12..14} )
+PYTHON_REQ_USE="threads(+)"
+
+inherit distutils-r1
+
+MY_P=${P/_}
+DESCRIPTION="Python documentation generator"
+HOMEPAGE="
+	https://www.sphinx-doc.org/
+	https://github.com/sphinx-doc/sphinx/
+	https://pypi.org/project/Sphinx/
+"
+SRC_URI="
+	https://github.com/sphinx-doc/sphinx/archive/v${PV/_}.tar.gz
+		-> ${MY_P}.gh.tar.gz
+"
+S=${WORKDIR}/${MY_P}
+
+LICENSE="BSD-2"
+SLOT="0"
+if [[ ${PV} != *_rc* ]]; then
+	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
+fi
+IUSE="doc latex"
+
+RDEPEND="
+	>=dev-python/alabaster-0.7.14[${PYTHON_USEDEP}]
+	>=dev-python/babel-2.13[${PYTHON_USEDEP}]
+	>=dev-python/docutils-0.21[${PYTHON_USEDEP}]
+	>=dev-python/imagesize-1.3[${PYTHON_USEDEP}]
+	>=dev-python/jinja2-3.1[${PYTHON_USEDEP}]
+	>=dev-python/packaging-23.0[${PYTHON_USEDEP}]
+	>=dev-python/pygments-2.14[${PYTHON_USEDEP}]
+	>=dev-python/requests-2.30.0[${PYTHON_USEDEP}]
+	>=dev-python/roman-numerals-1.0.0[${PYTHON_USEDEP}]
+	>=dev-python/snowballstemmer-2.2[${PYTHON_USEDEP}]
+	>=dev-python/sphinxcontrib-applehelp-1.0.7[${PYTHON_USEDEP}]
+	>=dev-python/sphinxcontrib-devhelp-1.0.6[${PYTHON_USEDEP}]
+	>=dev-python/sphinxcontrib-htmlhelp-2.0.6[${PYTHON_USEDEP}]
+	>=dev-python/sphinxcontrib-jsmath-1.0.1[${PYTHON_USEDEP}]
+	>=dev-python/sphinxcontrib-qthelp-1.0.6[${PYTHON_USEDEP}]
+	>=dev-python/sphinxcontrib-serializinghtml-1.1.9[${PYTHON_USEDEP}]
+	latex? (
+		dev-texlive/texlive-latexextra
+		dev-texlive/texlive-luatex
+		app-text/dvipng
+	)
+"
+BDEPEND="
+	>=dev-python/flit-core-3.11
+	doc? (
+		dev-python/sphinxcontrib-websupport[${PYTHON_USEDEP}]
+		media-gfx/graphviz
+	)
+	test? (
+		app-text/dvipng
+		>=dev-python/cython-3.0.0[${PYTHON_USEDEP}]
+		>=dev-python/defusedxml-0.7.1[${PYTHON_USEDEP}]
+		dev-python/pytest-rerunfailures[${PYTHON_USEDEP}]
+		>=dev-python/setuptools-67.0[${PYTHON_USEDEP}]
+		dev-texlive/texlive-fontsextra
+		dev-texlive/texlive-latexextra
+		dev-texlive/texlive-luatex
+		virtual/imagemagick-tools[jpeg,png,svg]
+	)
+"
+
+PATCHES=(
+	"${FILESDIR}/sphinx-3.2.1-doc-link.patch"
+)
+
+EPYTEST_PLUGINS=()
+EPYTEST_RERUNS=5
+# EPYTEST_XDIST breaks stuff
+distutils_enable_tests pytest
+
+python_prepare_all() {
+	local PATCHES=(
+		# https://github.com/sphinx-doc/sphinx/commit/c01b0eb640bbc3dbd8141f3ea08df9edaa78ab2c
+		"${FILESDIR}/${P}-test.patch"
+	)
+
+	# disable internet access
+	sed -i -e 's:^intersphinx_mapping:disabled_&:' \
+		doc/conf.py || die
+	# unpin dependencies
+	sed -i -e 's:,<[0-9.]*::' pyproject.toml || die
+
+	distutils-r1_python_prepare_all
+}
+
+python_compile_all() {
+	# we can't use distutils_enable_sphinx because it would
+	# introduce a dep on itself
+	use doc && build_sphinx doc
+}
+
+python_test() {
+	mkdir -p "${BUILD_DIR}/sphinx_tempdir" || die
+	local -x SPHINX_TEST_TEMPDIR="${BUILD_DIR}/sphinx_tempdir"
+
+	epytest
+}