diff --git a/devel/gdcm/Makefile b/devel/gdcm/Makefile
index 9194048e388b..aab8e0197be8 100644
--- a/devel/gdcm/Makefile
+++ b/devel/gdcm/Makefile
@@ -1,65 +1,65 @@
 PORTNAME=	gdcm
 PORTVERSION=	${GDCM_MAJOR}.${GDCM_MINOR}.${GDCM_PATCH}
 CATEGORIES=	devel
 MASTER_SITES=	SF/gdcm/gdcm%20${GDCM_MAJOR}.x/GDCM%20${PORTVERSION}
 
 MAINTAINER=	stephen@FreeBSD.org
 COMMENT=	Grassroots DICOM library
 WWW=		http://gdcm.sourceforge.net/
 
 LICENSE=	BSD3CLAUSE
 
 LIB_DEPENDS=	libopenjp2.so:graphics/openjpeg \
 		libexpat.so:textproc/expat2
 
 USES=		alias cmake compiler:c++11-lang pkgconfig python:build tar:bzip2 ssl
 USE_LDCONFIG=	yes
 
 OPTIONS_DEFINE=		VTK
 OPTIONS_SUB=		yes
 
 VTK_DESC=		Build VTK integration classes
 VTK_CXXFLAGS=		-I${LOCALBASE}/include/vtk-${VTK_VERSION}
 VTK_LIB_DEPENDS=	libvtkCommonCore-${VTK_VERSION}.so:math/vtk${VTK_VERSION:R}
 VTK_CMAKE_ON=		-DGDCM_USE_VTK:BOOL=ON \
 			-DVTK_DIR:PATH=${LOCALBASE}/lib/vtk-${VTK_VERSION}
 VTK_USES=		gl
 VTK_USE=		GL=glu
 VTK_BROKEN=		Fails to compile with VTK-9.1, see https://sourceforge.net/p/gdcm/bugs/537/
 
 # Change this when updating the port
 GDCM_MAJOR=	3
 GDCM_MINOR=	0
-GDCM_PATCH=	20
+GDCM_PATCH=	21
 
 # Change this whenever VTK is updated
 VTK_VERSION=	9.1
 
 CFLAGS+=	-I${LOCALBASE}/include
 CMAKE_ARGS=	-DGDCM_USE_SYSTEM_OPENSSL:BOOL=ON \
 		-DGDCM_USE_SYSTEM_EXPAT:BOOL=ON \
 		-DGDCM_USE_SYSTEM_OPENJPEG:BOOL=ON \
 		-DGDCM_USE_SYSTEM_ZLIB:BOOL=ON \
 		-DGDCM_BUILD_APPLICATIONS:BOOL=ON \
 		-DGDCM_BUILD_SHARED_LIBS:BOOL=ON \
 		-DGDCM_BUILD_EXAMPLES:BOOL=OFF \
 		-DGDCM_INSTALL_DATA_DIR:PATH=${DATADIR_REL} \
 		-DGDCM_DOCUMENTATION:BOOL=OFF \
 		-DGDCM_BUILD_DOCBOOK_MANPAGES:BOOL=OFF \
 		-DPython3_EXECUTABLE=${PYTHON_CMD} \
 		-DGDCM_DEFAULT_PYTHON_VERSION=${PYTHON_VER}
 
 .include <bsd.port.options.mk>
 
 .if ${PORT_OPTIONS:MVTK}
 DESKTOP_ENTRIES="Gdcmviewer" "Simple DICOM Viewer" "" "gdcmviewer" "" ""
 PLIST_SUB+=	VTK=""
 .else
 PLIST_SUB+=	VTK="@comment "
 .endif
 
 PLIST_SUB+=	GDCM_MAJOR="${GDCM_MAJOR}" \
 		GDCM_MINOR="${GDCM_MINOR}" \
 		GDCM_PATCH="${GDCM_PATCH}"
 
 .include <bsd.port.mk>
diff --git a/devel/gdcm/distinfo b/devel/gdcm/distinfo
index ac4694601105..47d8c96d807b 100644
--- a/devel/gdcm/distinfo
+++ b/devel/gdcm/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1668620567
-SHA256 (gdcm-3.0.20.tar.bz2) = d299731e229fe7595001f17e6b81e6f9a27daac3df7295543753525242cea0b2
-SIZE (gdcm-3.0.20.tar.bz2) = 3030142
+TIMESTAMP = 1674833221
+SHA256 (gdcm-3.0.21.tar.bz2) = f29dbdd3b6b4c30c9803e6466b88b139d67f5585768565fe29f0be65ad737744
+SIZE (gdcm-3.0.21.tar.bz2) = 3030596