diff --git a/dev-libs/olm/Manifest b/dev-libs/olm/Manifest
index 31dcef7d4d..bff4e73e71 100644
--- a/dev-libs/olm/Manifest
+++ b/dev-libs/olm/Manifest
@@ -1 +1,2 @@
 DIST olm-3.1.4.tar.bz2 461540 BLAKE2B fa69b1543330c5da37c04227b51197ba57968ef24def40df621b85c0988eac91f8a155f600ab26849f2cd213059c97c7035be6dcca0943245cd4e4895da314b3 SHA512 87265d835ca7332d162bd3573dffdd09c8337c464dd673f100db9193e8ea4cedd8cb2a92cf2c34ad1b552a55bbbce8f87a47559ccfba03fa69b32fc7ff07f5f0
+DIST olm-3.1.5.tar.bz2 461855 BLAKE2B 20412686ea1621de0d45885ae6f44331389cb401410809901187431eb101113f4186dc5b31c055da15143bec70f2251ee506e4fb50b0a8e495bdfa6cdb302b9e SHA512 a41be45e3fadb4e24654a4db8a68dab7fb8b021aeaf48b524d9c2c1e9d48e0b2200b9f1ac8431e79bc620560b16c66fb4c2d3727901b47b78288ea22b3f6ba02
diff --git a/dev-libs/olm/olm-3.1.5.ebuild b/dev-libs/olm/olm-3.1.5.ebuild
new file mode 100644
index 0000000000..503023949e
--- /dev/null
+++ b/dev-libs/olm/olm-3.1.5.ebuild
@@ -0,0 +1,36 @@
+# Copyright 2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake
+
+DESCRIPTION="Implementation of the olm and megolm cryptographic ratchets"
+HOMEPAGE="https://gitlab.matrix.org/matrix-org/olm"
+SRC_URI="https://gitlab.matrix.org/matrix-org/${PN}/-/archive/${PV}/${P}.tar.bz2"
+
+LICENSE="Apache-2.0"
+SLOT="0"
+IUSE="doc test"
+KEYWORDS="~amd64"
+
+RDEPEND=""
+DEPEND="${RDEPEND}"
+
+src_configure() {
+	local -a mycmakeargs=(
+		-DOLM_TESTS="$(usex test)"
+	)
+
+	cmake_src_configure
+}
+
+src_test() {
+	BUILD_DIR="${BUILD_DIR}/tests" cmake_src_test
+}
+
+src_install() {
+	use doc && DOCS=( README.md docs/{{,meg}olm,signing}.md )
+
+	cmake_src_install
+}