diff --git a/math/py-GridDataFormats/Makefile b/math/py-GridDataFormats/Makefile
index b5005ca1bdf4..b2ddd51c18c9 100644
--- a/math/py-GridDataFormats/Makefile
+++ b/math/py-GridDataFormats/Makefile
@@ -1,26 +1,37 @@
 PORTNAME=	GridDataFormats
-DISTVERSION=	1.0.2
-PORTREVISION=	3
+DISTVERSION=	1.2.0
 CATEGORIES=	math python
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Handle data on a grid: NumPy n-dimensional arrays
 WWW=		https://github.com/MDAnalysis/GridDataFormats
 
-LICENSE=	GPLv3
-LICENSE_FILE=	${WRKSRC}/COPYING
+LICENSE=	LGPL3+
+LICENSE_FILE=	${WRKSRC}/COPYING.LESSER
 
-RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}numpy>=1.16:math/py-numpy@${PY_FLAVOR} \
+BUILD_DEPENDS=	${PY_SETUPTOOLS} \
+		${PYTHON_PKGNAMEPREFIX}versioningit>0:devel/py-versioningit@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}wheel>0:devel/py-wheel@${PY_FLAVOR}
+RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}numpy>=1.21:math/py-numpy@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}mrcfile>0:biology/py-mrcfile@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}scipy>0:science/py-scipy@${PY_FLAVOR}
 
 USES=		python
-USE_PYTHON=	distutils autoplist concurrent pytest
+USE_PYTHON=	pep517 autoplist concurrent pytest
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	MDAnalysis
 
+MAKE_ENV=	MY_PROJECT_VERSION=${DISTVERSION}
+
+BINARY_ALIAS=	git=false
+
 NO_ARCH=	yes
 
+post-patch:
+	@${ECHO} ${DISTVERSION} > ${WRKSRC}/VERSION
+
+# tests as of 1.2.0: 123 passed, 26 skipped in 2.62s
+
 .include <bsd.port.mk>
diff --git a/math/py-GridDataFormats/distinfo b/math/py-GridDataFormats/distinfo
index a5022cf52bce..914593b51466 100644
--- a/math/py-GridDataFormats/distinfo
+++ b/math/py-GridDataFormats/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1697967650
-SHA256 (MDAnalysis-GridDataFormats-1.0.2_GH0.tar.gz) = 19522bc2de4af0bc4dd7d44716951852cd7ff6a98f59de3551301fcea70ff57c
-SIZE (MDAnalysis-GridDataFormats-1.0.2_GH0.tar.gz) = 2376352
+TIMESTAMP = 1784748671
+SHA256 (MDAnalysis-GridDataFormats-1.2.0_GH0.tar.gz) = 1da529335c0b8b95c8590b1bceb4c7efd1027fa3ed01563bcd853d2329834b7e
+SIZE (MDAnalysis-GridDataFormats-1.2.0_GH0.tar.gz) = 5792496
diff --git a/math/py-GridDataFormats/files/patch-pyproject.toml b/math/py-GridDataFormats/files/patch-pyproject.toml
new file mode 100644
index 000000000000..0a1180a19372
--- /dev/null
+++ b/math/py-GridDataFormats/files/patch-pyproject.toml
@@ -0,0 +1,21 @@
+--- pyproject.toml.orig	2026-05-23 02:52:48 UTC
++++ pyproject.toml
+@@ -8,8 +8,6 @@ description = "Reading and writing of data on regular 
+ [project]
+ name = "GridDataFormats"
+ description = "Reading and writing of data on regular grids in Python"
+-license = "LGPL-3.0-or-later"
+-license-files = ["COPYING", "COPYING.LESSER", "AUTHORS"]
+ authors = [
+     {name = "Oliver Beckstein", email = "orbeckst@gmail.com"},
+ ]
+@@ -47,6 +45,9 @@ dynamic = [
+ dynamic = [
+     "version",
+ ]
++
++[tool.setuptools.dynamic]
++version = {file = ["VERSION"]}
+ 
+ [project.optional-dependencies]
+ test = [