diff --git a/devel/py-fastnumbers/Makefile b/devel/py-fastnumbers/Makefile
index 27acb883709d..e27aa650f971 100644
--- a/devel/py-fastnumbers/Makefile
+++ b/devel/py-fastnumbers/Makefile
@@ -1,26 +1,29 @@
 PORTNAME=	fastnumbers
-DISTVERSION=	5.1.0
+DISTVERSION=	5.1.1
 CATEGORIES=	devel python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Super-fast and clean conversions to numbers
 WWW=		https://github.com/SethMMorton/fastnumbers
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	${PY_SETUPTOOLS} \
+		${PYTHON_PKGNAMEPREFIX}setuptools-scm>=7.0:devel/py-setuptools-scm@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}wheel>0:devel/py-wheel@${PY_FLAVOR}
 TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}hypothesis>0:devel/py-hypothesis@${PY_FLAVOR}
 
 USES=		python
 USE_PYTHON=	pep517 autoplist pytest
 
 TEST_ENV=	${MAKE_ENV} PYTHONPATH=${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}
 
 post-install:
 	@${STRIP_CMD} ${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/fastnumbers/fastnumbers*.so
 
+# tests as of 5.1.1: 1845 passed, 1 skipped in 12.23s
+
 .include <bsd.port.mk>
diff --git a/devel/py-fastnumbers/distinfo b/devel/py-fastnumbers/distinfo
index 15a814ef3119..e9c40b9b851c 100644
--- a/devel/py-fastnumbers/distinfo
+++ b/devel/py-fastnumbers/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1703361816
-SHA256 (fastnumbers-5.1.0.tar.gz) = e092d33f8b95c3171a2fb34e579efe0c54b0290dd7f96ffaa2762437601d90a7
-SIZE (fastnumbers-5.1.0.tar.gz) = 191358
+TIMESTAMP = 1780882921
+SHA256 (fastnumbers-5.1.1.tar.gz) = 183fa021cdc052edaeede5c23e3086461deb7562b567614edf71b29515f5fa4b
+SIZE (fastnumbers-5.1.1.tar.gz) = 193827
diff --git a/devel/py-fastnumbers/files/patch-pyproject.toml b/devel/py-fastnumbers/files/patch-pyproject.toml
new file mode 100644
index 000000000000..e589b3ba5805
--- /dev/null
+++ b/devel/py-fastnumbers/files/patch-pyproject.toml
@@ -0,0 +1,11 @@
+-- Relax setuptools requirement for older setuptools compatibility.
+
+--- pyproject.toml.orig	2024-12-15 06:48:07 UTC
++++ pyproject.toml
+@@ -1,5 +1,5 @@
+ [build-system]
+-requires = ["setuptools>=64", "setuptools-scm>=8.0"]
++requires = ["setuptools", "setuptools-scm>=8.0"]
+ build-backend = "setuptools.build_meta"
+ 
+ [project]