Index: head/devel/py-prance/Makefile
===================================================================
--- head/devel/py-prance/Makefile	(revision 517577)
+++ head/devel/py-prance/Makefile	(revision 517578)
@@ -1,44 +1,44 @@
 # Created by: Po-Chuan Hsieh <sunpoet@FreeBSD.org>
 # $FreeBSD$
 
 PORTNAME=	prance
-PORTVERSION=	0.16.2
+PORTVERSION=	0.17.0
 CATEGORIES=	devel python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Resolving Swagger/OpenAPI 2.0 and 3.0.0 parser
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pytest-runner>=0:devel/py-pytest-runner@${PY_FLAVOR}
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}chardet>=3.0:textproc/py-chardet@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}requests>=2.21:www/py-requests@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}semver>=2.8:devel/py-semver@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}six>=1.12:devel/py-six@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}yaml>=5.1:devel/py-yaml@${PY_FLAVOR}
 
-USES=		python
-USE_PYTHON=	autoplist concurrent distutils
+USES=		python:3.4+
+USE_PYTHON=	autoplist distutils
 
 NO_ARCH=	yes
 
 OPTIONS_DEFINE=	CLI ICU
 OPTIONS_MULTI=	BACKEND
 OPTIONS_MULTI_BACKEND=	FLEX OSV SSV
 OPTIONS_DEFAULT=OSV
 CLI_DESC=	Command-line interface support
 FLEX_DESC=	Use py-flex as backend
 ICU_DESC=	Unicode support
 OSV_DESC=	Use py-openapi-spec-validator as backend
 SSV_DESC=	Use py-swagger-spec-validator as backend
 
 CLI_RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}click>=7.0<8:devel/py-click@${PY_FLAVOR}
 FLEX_RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}flex>=6.13<7:devel/py-flex@${PY_FLAVOR}
 ICU_RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pyicu>=2.2<3:devel/py-pyicu@${PY_FLAVOR}
 OSV_RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}openapi-spec-validator>=0.2.1<0.3:devel/py-openapi-spec-validator@${PY_FLAVOR}
 SSV_RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}swagger-spec-validator>=2.4<3:devel/py-swagger-spec-validator@${PY_FLAVOR}
 
 .include <bsd.port.mk>
Index: head/devel/py-prance/distinfo
===================================================================
--- head/devel/py-prance/distinfo	(revision 517577)
+++ head/devel/py-prance/distinfo	(revision 517578)
@@ -1,3 +1,3 @@
-TIMESTAMP = 1573649210
-SHA256 (prance-0.16.2.tar.gz) = 6c71755a3497639cb29548189632ca7e6335ca90bf74f8e3443a0d386b957041
-SIZE (prance-0.16.2.tar.gz) = 683181
+TIMESTAMP = 1573740354
+SHA256 (prance-0.17.0.tar.gz) = a128d0d5f639a6a19eefedd787a6ce9603634c3908927b1215653e4a8375195f
+SIZE (prance-0.17.0.tar.gz) = 685558