diff --git a/devel/py-msgspec/Makefile b/devel/py-msgspec/Makefile
index 75a1bad6371a..9839190487bc 100644
--- a/devel/py-msgspec/Makefile
+++ b/devel/py-msgspec/Makefile
@@ -1,31 +1,32 @@
 PORTNAME=	msgspec
-PORTVERSION=	0.19.0
+PORTVERSION=	0.20.0
 CATEGORIES=	devel python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Fast serialization and validation library
 WWW=		https://jcristharif.com/msgspec/ \
 		https://github.com/jcrist/msgspec
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}setuptools>=0:devel/py-setuptools@${PY_FLAVOR} \
+BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}setuptools>=61:devel/py-setuptools@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}setuptools-scm>=8:devel/py-setuptools-scm@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}wheel>=0:devel/py-wheel@${PY_FLAVOR}
 
 USES=		python
 USE_PYTHON=	autoplist concurrent pep517
 
 OPTIONS_DEFINE=	TOML YAML
 OPTIONS_DEFAULT=TOML YAML
 
 TOML_RUN_DEPENDS=	${PY_TOMLI} \
 			${PYTHON_PKGNAMEPREFIX}tomli-w>=0:textproc/py-tomli-w@${PY_FLAVOR}
 YAML_RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pyyaml>=0:devel/py-pyyaml@${PY_FLAVOR}
 
 post-install:
 	${FIND} ${STAGEDIR}${PYTHON_SITELIBDIR} -name '*.so' -exec ${STRIP_CMD} {} +
 
 .include <bsd.port.mk>
diff --git a/devel/py-msgspec/distinfo b/devel/py-msgspec/distinfo
index f98fc845a551..fb25baec91bf 100644
--- a/devel/py-msgspec/distinfo
+++ b/devel/py-msgspec/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1735705167
-SHA256 (msgspec-0.19.0.tar.gz) = 604037e7cd475345848116e89c553aa9a233259733ab51986ac924ab1b976f8e
-SIZE (msgspec-0.19.0.tar.gz) = 216934
+TIMESTAMP = 1764510954
+SHA256 (msgspec-0.20.0.tar.gz) = 692349e588fde322875f8d3025ac01689fead5901e7fb18d6870a44519d62a29
+SIZE (msgspec-0.20.0.tar.gz) = 317862
diff --git a/devel/py-msgspec/files/patch-pyproject.toml b/devel/py-msgspec/files/patch-pyproject.toml
new file mode 100644
index 000000000000..322a7f058df7
--- /dev/null
+++ b/devel/py-msgspec/files/patch-pyproject.toml
@@ -0,0 +1,22 @@
+--- pyproject.toml.orig	2025-11-24 03:44:10 UTC
++++ pyproject.toml
+@@ -1,6 +1,6 @@ requires = [
+ [build-system]
+ requires = [
+-  "setuptools>=80",
++  "setuptools>=61",
+   "setuptools-scm>=8",
+ ]
+ build-backend = "setuptools.build_meta"
+@@ -12,10 +12,7 @@ readme = "README.md"
+ ]
+ description = "A fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML."
+ readme = "README.md"
+-license = "BSD-3-Clause"
+-license-files = [
+-  "LICENSE",
+-]
++license = {text = "BSD-3-Clause"}
+ requires-python = ">=3.9"
+ maintainers = [
+   { name = "Jim Crist-Harif", email = "jcristharif@gmail.com" },