diff --git a/math/py-diffcp/Makefile b/math/py-diffcp/Makefile
index 372efac9ac42..afa13a24dfb7 100644
--- a/math/py-diffcp/Makefile
+++ b/math/py-diffcp/Makefile
@@ -1,32 +1,38 @@
 PORTNAME=	diffcp
-DISTVERSION=	1.0.23
-PORTREVISION=	2
+DISTVERSION=	1.1.9
 CATEGORIES=	math python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Differentiation through cone programs
 WWW=		https://github.com/cvxgrp/diffcp/
 
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-PY_DEPENDS=	${PYTHON_PKGNAMEPREFIX}numpy>=1.16:math/py-numpy@${PY_FLAVOR} \
-		${PYTHON_PKGNAMEPREFIX}pybind11>0:devel/py-pybind11@${PY_FLAVOR} \
-		${PYTHON_PKGNAMEPREFIX}scipy>=0.13.2:science/py-scipy@${PY_FLAVOR}
-BUILD_DEPENDS=	${PY_SETUPTOOLS} \
-		${PY_DEPENDS} \
-		${PYTHON_PKGNAMEPREFIX}wheel>=0:devel/py-wheel@${PY_FLAVOR}
-RUN_DEPENDS=	${PY_DEPENDS}
-TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}cvxpy>0:math/py-cvxpy@${PY_FLAVOR}
+BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pybind11>=2.4:devel/py-pybind11@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}scikit-build-core>0:devel/py-scikit-build-core@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}setuptools-scm>=8:devel/py-setuptools-scm@${PY_FLAVOR}
+RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}numpy>=2.0:math/py-numpy@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}scipy>=1.10:science/py-scipy@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}scs>=3.0.0:math/py-scs@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}threadpoolctl>=1.1:devel/py-threadpoolctl@${PY_FLAVOR}
+TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}clarabel>=0.5.1:math/py-clarabel@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}cvxpy>=1.6.3:math/py-cvxpy@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}ecos>=2.0.10:math/py-ecos@${PY_FLAVOR}
 
-USES=		compiler:c++11-lang python
+USES=		cmake:indirect compiler:c++11-lang python
 USE_PYTHON=	pep517 autoplist pytest
 
 TEST_ENV=	${MAKE_ENV} PYTHONPATH=${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}
 
+# test_clarabel.py::test_threading deadlocks in this environment.
+PYTEST_IGNORED_TESTS=	test_threading
+
 post-install:
-	@${STRIP_CMD} ${STAGEDIR}${PYTHON_SITELIBDIR}/_diffcp${PYTHON_TAG}.so
+	@${STRIP_CMD} ${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/diffcp/_diffcp${PYTHON_TAG}.so
+
+# tests as of 1.1.9: 41 passed, 2 deselected, 2 warnings in 5.68s
 
 .include <bsd.port.mk>
diff --git a/math/py-diffcp/distinfo b/math/py-diffcp/distinfo
index e576e6e42778..cc1b80516526 100644
--- a/math/py-diffcp/distinfo
+++ b/math/py-diffcp/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1718822369
-SHA256 (diffcp-1.0.23.tar.gz) = 09fdcb3bc23668ccd09fdf3e20f790518c5b9be1877770bb6c265380c34f2199
-SIZE (diffcp-1.0.23.tar.gz) = 2198434
+TIMESTAMP = 1784997099
+SHA256 (diffcp-1.1.9.tar.gz) = 10016ef0aa221d3d7875210179dffb3dd6010ebd2328efab582e84178b539e2b
+SIZE (diffcp-1.1.9.tar.gz) = 2144994
diff --git a/math/py-diffcp/files/patch-pyproject.toml b/math/py-diffcp/files/patch-pyproject.toml
deleted file mode 100644
index dce6bde7455a..000000000000
--- a/math/py-diffcp/files/patch-pyproject.toml
+++ /dev/null
@@ -1,15 +0,0 @@
---- pyproject.toml.orig	2024-06-19 18:46:39 UTC
-+++ pyproject.toml
-@@ -2,9 +2,9 @@ requires = [
- requires = [
-     "numpy>=1.15,<1.16; python_version=='3.7'",
-     "numpy>=1.17,<1.18; python_version=='3.8'",
--    "numpy>=1.19,<1.20; python_version=='3.9'",
--    "numpy>=1.21,<1.22; python_version=='3.10'",
--    "numpy>=1.23,<1.24; python_version=='3.11'",
-+    "numpy; python_version=='3.9'",
-+    "numpy; python_version=='3.10'",
-+    "numpy; python_version=='3.11'",
-     "scipy>=1.1.0",
-     "pybind11>=2.4",
-     "setuptools",