diff --git a/dev-libs/olm/Manifest b/dev-libs/olm/Manifest
index 8d38cba..3f9e18c 100644
--- a/dev-libs/olm/Manifest
+++ b/dev-libs/olm/Manifest
@@ -1 +1,2 @@
 DIST olm-3.2.12.tar.bz2 2742680 BLAKE2B 47c3bacaf05cc0bb6088da34e6a031f9c770893771ddcf9f13bc0e10a050139f14969dfc91f38684336872089b4cbf9d66e4bd85692989eba5fc3df966da3cd2 SHA512 a25db4c72910512beca9120db59ebeeefc5fff6a381e88ae7cf261bc5ab896edc2cfe25ece57b7b28b2e3d8bc66367c457133c147e1a3514f926714159b5cf6f
+DIST olm-3.2.15.tar.bz2 2744760 BLAKE2B 44486a63217998010a0bb7e01ff3315c88e139d686b97158e67af29b2f052912412541fb944a17c5d8931df9c641a73e521ef8d0ff352b80fe30bd6fb73b2e7b SHA512 81832766e477fc17908e8d1c49b5403d87b5977fd9102605d95ef2a3907619b7301e32fe0e18ec0f575b1f004ce248633307ff43b0f48bc9bb2313cdfefd6ea7
diff --git a/dev-libs/olm/olm-3.2.15.ebuild b/dev-libs/olm/olm-3.2.15.ebuild
new file mode 100644
index 0000000..64e893b
--- /dev/null
+++ b/dev-libs/olm/olm-3.2.15.ebuild
@@ -0,0 +1,112 @@
+# Copyright 2020-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DISTUTILS_USE_PEP517=setuptools
+DISTUTILS_OPTIONAL=1
+PYTHON_COMPAT=( python3_{10..11} )
+
+inherit cmake distutils-r1
+
+DESCRIPTION="An implementation of the Double Ratchet cryptographic ratchet in C++"
+HOMEPAGE="https://git.matrix.org/git/olm/about/"
+
+if [[ "${PV}" == 9999 ]]; then
+	inherit git-r3
+	EGIT_REPO_URI="https://gitlab.matrix.org/matrix-org/${PN}.git"
+else
+	SRC_URI="https://gitlab.matrix.org/matrix-org/${PN}/-/archive/${PV}/${P}.tar.bz2"
+	KEYWORDS="~amd64"
+fi
+
+LICENSE="Apache-2.0"
+SLOT="0/$(ver_cut 1)"
+IUSE="python test"
+REQUIRED_USE="
+	doc? ( python )
+	python? ( ${PYTHON_REQUIRED_USE} )
+"
+
+RDEPEND="
+	python? (
+		${PYTHON_DEPS}
+		>=dev-python/cffi-1.0.0[${PYTHON_USEDEP}]
+	)
+"
+BDEPEND="
+	${DISTUTILS_DEPS}
+	python? (
+		${RDEPEND}
+		test? (
+			dev-python/aspectlib[${PYTHON_USEDEP}]
+		)
+	)
+"
+
+distutils_enable_tests pytest
+distutils_enable_sphinx "${S}"/python/docs
+
+DOCS=( "${S}/docs/" )
+
+EPYTEST_DESELECT=(
+	# deselect tests using benchmark fixtures
+	"tests/group_session_test.py::TestClass::test_encrypt"
+	"tests/group_session_test.py::TestClass::test_decrypt"
+)
+
+src_prepare() {
+	sed -i '/flake8/,/^$/ d' python/setup.cfg || die
+
+	cmake_src_prepare
+	if use python; then
+		pushd python || die
+		distutils-r1_src_prepare
+		popd || die
+	fi
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DBUILD_SHARED_LIBS=ON
+		-DOLM_TESTS=$(usex test)
+	)
+	cmake_src_configure
+	if use python; then
+		pushd python || die
+		distutils-r1_src_configure
+		popd || die
+	fi
+}
+
+src_compile() {
+	cmake_src_compile
+	if use python; then
+		pushd python || die
+		# Let python build find the already built libolm
+		export LIBRARY_PATH="${BUILD_DIR}/"
+		distutils-r1_src_compile
+		popd || die
+	fi
+}
+
+src_install() {
+	cmake_src_install
+	if use python; then
+		pushd python || die
+		distutils-r1_src_install
+		popd || die
+	fi
+	einstalldocs
+}
+
+src_test() {
+	# eclass doesnt appear to be to handle CTestTestfile.cmake in build root locations
+	BUILD_DIR="${BUILD_DIR}/tests" cmake_src_test
+
+	if use python; then
+		pushd "${S}"/python || die
+		LD_LIBRARY_PATH="${BUILD_DIR}:${LD_LIBRARY_PATH}" distutils-r1_src_test
+		popd || die
+	fi
+}