diff --git a/dev-cpp/nlohmann_json/Manifest b/dev-cpp/nlohmann_json/Manifest
index ec3508287207..dd3063a3be11 100644
--- a/dev-cpp/nlohmann_json/Manifest
+++ b/dev-cpp/nlohmann_json/Manifest
@@ -1,2 +1,4 @@
+DIST nlohmann_json-3.10.2.tar.gz 7054440 BLAKE2B e7da213fb75d528b1f5425822f5b598e882f232a67670aaae2d8f89c76e72ee23fa3344d1acfef2b0338a6a423d17b231b7e047ff064c984c2ec7783b721a22c SHA512 9a399dfc8aab19c9fc12470e8087895b1c05d48a9bcc731b483d8670c361cffb2adc3ccced822b7f17255e88387a441d619c4e1f1afeb702d1d035ad24fe22ed
 DIST nlohmann_json-3.12.0.tar.gz 9678593 BLAKE2B db4310eeecee130a73f6dd774367104d0631e25af8bf507185c708598f2b9af67fc8387fe2b93bb27b91859518bf6c81c91dbde301e3c1a717aae6866e257e3d SHA512 6cc1e86261f8fac21cc17a33da3b6b3c3cd5c116755651642af3c9e99bb3538fd42c1bd50397a77c8fb6821bc62d90e6b91bcdde77a78f58f2416c62fc53b97d
+DIST nlohmann_json-testdata-3.0.0.tar.gz 112348454 BLAKE2B f0a47b41805bf1426f612e9a82efea2a3e5b1c15740c1c531d859e60dc5daeb85209b4fe363fd8fb84e3bbf01a2578c74538ba3e769726494047979f5a4d468d SHA512 d9af8419b837c592ec7519cd5772651c761078a9c43cf2a309cee55c323aee0df0c233fb58a07d5ee2e77492ac8b16398de234b387eae037a60e3c9ba5b08891
 DIST nlohmann_json-testdata-3.1.0.tar.gz 115036393 BLAKE2B 809be0728a0b9d007fcc752911bdf6f7e548d6e3ec59871ea2b16d87d8248ca4dd2f681a1d0f82c618463294188ad41d6d965b8bdc39c70fdcf4b939d4121e9c SHA512 db6c411b37f2154f5dd1ed90f4e8fa0907f4a736cd0ff79943bcacf9da422285ff142bb6a7dc6022b236090083166ac1ab197be3f480d8dc50b26a91a9477821
diff --git a/dev-cpp/nlohmann_json/nlohmann_json-3.10.2.ebuild b/dev-cpp/nlohmann_json/nlohmann_json-3.10.2.ebuild
new file mode 100644
index 000000000000..f1b64104f341
--- /dev/null
+++ b/dev-cpp/nlohmann_json/nlohmann_json-3.10.2.ebuild
@@ -0,0 +1,63 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit cmake
+
+# Check https://github.com/nlohmann/json/blob/develop/cmake/download_test_data.cmake to find test archive version
+TEST_VERSION="3.0.0"
+DESCRIPTION="JSON for Modern C++"
+HOMEPAGE="https://github.com/nlohmann/json https://nlohmann.github.io/json/"
+SRC_URI="
+	https://github.com/nlohmann/json/archive/v${PV}.tar.gz -> ${P}.tar.gz
+	test? ( https://github.com/nlohmann/json_test_data/archive/v${TEST_VERSION}.tar.gz -> ${PN}-testdata-${TEST_VERSION}.tar.gz )
+"
+S="${WORKDIR}/json-${PV}"
+
+LICENSE="MIT"
+SLOT="0"
+KEYWORDS="~amd64 ~arm ~arm64 ~ppc ~ppc64 ~riscv ~x86"
+IUSE="doc test"
+#RESTRICT="!test? ( test )"
+# Need to report failing tests upstream
+# Tests only just added, large test suite, majority pass
+RESTRICT="test"
+
+BDEPEND="doc? ( app-text/doxygen )"
+
+DOCS=( ChangeLog.md README.md )
+
+src_configure() {
+	# Tests are built by default so we can't group the test logic below
+	local mycmakeargs=(
+		-DJSON_MultipleHeaders=ON
+		-DJSON_BuildTests=$(usex test)
+	)
+
+	# Define test data directory here to avoid unused var QA warning, bug #747826
+	use test && mycmakeargs+=( -DJSON_TestDataDirectory="${S}"/json_test_data )
+
+	cmake_src_configure
+}
+
+src_compile() {
+	cmake_src_compile
+
+	if use doc; then
+		emake -C doc
+		HTML_DOCS=( doc/html/. )
+	fi
+}
+
+src_test() {
+	cd "${BUILD_DIR}/test" || die
+
+	# Skip certain tests needing git per upstream
+	# https://github.com/nlohmann/json/issues/2189
+	local myctestargs=(
+		"-LE git_required"
+	)
+
+	cmake_src_test
+}