diff --git a/devel/py-setuptools-dso/Makefile b/devel/py-setuptools-dso/Makefile
index c4739f351965..054da756b323 100644
--- a/devel/py-setuptools-dso/Makefile
+++ b/devel/py-setuptools-dso/Makefile
@@ -1,24 +1,26 @@
 PORTNAME=	setuptools-dso
-DISTVERSION=	2.11
+DISTVERSION=	2.12.3
 CATEGORIES=	devel python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 DISTNAME=	${PORTNAME:S/-/_/}-${DISTVERSION}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Setuptools extension to build non-python shared libraries
 WWW=		https://github.com/mdavidsaver/setuptools_dso
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	${PY_SETUPTOOLS} \
 		${PYTHON_PKGNAMEPREFIX}wheel>0:devel/py-wheel@${PY_FLAVOR}
 RUN_DEPENDS=	${PY_SETUPTOOLS}
 
 USES=		python
 USE_PYTHON=	pep517 autoplist pytest
 
 NO_ARCH=	yes
 
+# tests as of 2.12.3: 7 passed, 1 warning in 0.70s
+
 .include <bsd.port.mk>
diff --git a/devel/py-setuptools-dso/distinfo b/devel/py-setuptools-dso/distinfo
index 104f6cfb71bb..722042184c28 100644
--- a/devel/py-setuptools-dso/distinfo
+++ b/devel/py-setuptools-dso/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1723789311
-SHA256 (setuptools_dso-2.11.tar.gz) = 953e66a744e21dbbe4ad73e22b9fee2e47bae739f26bc63ab37473a45b975456
-SIZE (setuptools_dso-2.11.tar.gz) = 20734
+TIMESTAMP = 1784569258
+SHA256 (setuptools_dso-2.12.3.tar.gz) = 9effb7bc38f87ff9aed33cc69e860320804ca6c69af8896dbba10996a49b5d7e
+SIZE (setuptools_dso-2.12.3.tar.gz) = 21510
diff --git a/devel/py-setuptools-dso/files/patch-src_setuptools__dso_probe.py b/devel/py-setuptools-dso/files/patch-src_setuptools__dso_probe.py
new file mode 100644
index 000000000000..5fbdb6112048
--- /dev/null
+++ b/devel/py-setuptools-dso/files/patch-src_setuptools__dso_probe.py
@@ -0,0 +1,15 @@
+-- Add FreeBSD support to target OS detection.
+-- FreeBSD uses the __FreeBSD__ macro which is not recognized by the 
+-- original probe, causing target_os to be None. This patch adds FreeBSD
+-- to the list of recognized operating systems.
+
+--- src/setuptools_dso/probe.py.orig	2026-02-11 01:15:48 UTC
++++ src/setuptools_dso/probe.py
+@@ -403,6 +403,7 @@ class ToolchainInfo(object):
+         'target_os':[
+             ('__APPLE__', 'osx'),
+             ('__CYGWIN__', 'cygwin'),
++            ('__FreeBSD__', 'freebsd'),
+             ('__linux__', 'linux'),
+             ('_WIN32', 'windows'),
+         ],