diff --git a/devel/py-diff-cover/Makefile b/devel/py-diff-cover/Makefile
index 9108db3ec2d8..01d8144921ca 100644
--- a/devel/py-diff-cover/Makefile
+++ b/devel/py-diff-cover/Makefile
@@ -1,41 +1,43 @@
 PORTNAME=	diff-cover
-DISTVERSION=	10.4.1
+DISTVERSION=	10.5.1
 CATEGORIES=	devel python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 DISTNAME=	${PORTNAME:S/-/_/}-${PORTVERSION}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Run coverage and linting reports on diffs
 WWW=		https://github.com/Bachmann1234/diff_cover
 
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}poetry-core>0:devel/py-poetry-core@${PY_FLAVOR} \
-		${PY_SETUPTOOLS}
+BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}poetry-core>0:devel/py-poetry-core@${PY_FLAVOR}
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}chardet>=3.0.0:textproc/py-chardet@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}Jinja2>=2.7.1:devel/py-Jinja2@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}pluggy>=0.13.1:devel/py-pluggy@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}pygments>=2.19.1:textproc/py-pygments@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}tomli>=1.2.1:textproc/py-tomli@${PY_FLAVOR}
-TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}hatch-docstring-description>0:devel/py-hatch-docstring-description@${PY_FLAVOR} \
-		pylint${PYTHON_PKGNAMESUFFIX}>0:devel/pylint@${PY_FLAVOR} \
+TEST_DEPENDS=	pylint${PYTHON_PKGNAMESUFFIX}>0:devel/pylint@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}pytest-cov>0:devel/py-pytest-cov@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}pytest-datadir>=1.4.1:devel/py-pytest-datadir@${PY_FLAVOR} \
-		${PYTHON_PKGNAMEPREFIX}pytest-mock>0:devel/py-pytest-mock@${PY_FLAVOR}
+		${PYTHON_PKGNAMEPREFIX}pytest-mock>0:devel/py-pytest-mock@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}pytest-xdist>0:devel/py-pytest-xdist@${PY_FLAVOR}
 
 USES=		python
 USE_PYTHON=	pep517 autoplist pytest
 
 MAKE_ENV+=	GIT_DIR=${WRKDIR} # workaround for https://github.com/python-poetry/poetry/issues/5547
 TEST_ENV=	${MAKE_ENV} \
-		PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 \
 		PYTHONPATH=${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}
-TEST_ARGS=	-p pytest_mock -p pytest_datadir.plugin tests
+TEST_ARGS=	--disable-plugin-autoload \
+		-p pytest_mock \
+		-p pytest_datadir.plugin \
+		-p xdist \
+		tests
 
 NO_ARCH=	yes
 
-# tests as of 10.4.0: 369 passed in 9.85s
+# tests as of 10.5.1: 391 passed in 4.91s
 
 .include <bsd.port.mk>
diff --git a/devel/py-diff-cover/distinfo b/devel/py-diff-cover/distinfo
index ef97170f5843..7510863fec1d 100644
--- a/devel/py-diff-cover/distinfo
+++ b/devel/py-diff-cover/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1784868876
-SHA256 (diff_cover-10.4.1.tar.gz) = 0ec566955c9ee7da2f6cc48fa16fac7f97ad1fc4e50a887ffb9cfe5eb1e831df
-SIZE (diff_cover-10.4.1.tar.gz) = 108279
+TIMESTAMP = 1789395215
+SHA256 (diff_cover-10.5.1.tar.gz) = f1c9417c62111e40a81c482c692c5cdd131ff93317baa993044cb291912ebba3
+SIZE (diff_cover-10.5.1.tar.gz) = 113297
diff --git a/devel/py-diff-cover/files/patch-tests_test__integration.py b/devel/py-diff-cover/files/patch-tests_test__integration.py
new file mode 100644
index 000000000000..dbf7738df63b
--- /dev/null
+++ b/devel/py-diff-cover/files/patch-tests_test__integration.py
@@ -0,0 +1,17 @@
+-- tests/test_integration.py: normalize quote HTML entities when comparing
+-- expected and generated HTML. Newer pygments/Jinja2 emit raw quotes while
+-- the bundled fixtures still use &quot;/&#39; entities.
+-- Upstream issue: https://github.com/Bachmann1234/diff-cover/issues
+
+--- tests/test_integration.py.orig	2026-09-14 14:52:48 UTC
++++ tests/test_integration.py
+@@ -105,6 +105,9 @@ def clean_html(html, clear_inline_css):
+ def clean_html(html, clear_inline_css):
+     if clear_inline_css:
+         html = re.sub("<style>.*</style>", "", html, flags=re.DOTALL)
++    # Normalize HTML entity variants of quotes to tolerate pygments/Jinja2
++    # escaping differences across dependency versions.
++    html = html.replace("&quot;", '"').replace("&#39;", "'")
+     return html.strip()
+ 
+