Index: devel/py-jsonschema/Makefile
===================================================================
--- devel/py-jsonschema/Makefile	(revision 460226)
+++ devel/py-jsonschema/Makefile	(working copy)
@@ -3,6 +3,7 @@
 
 PORTNAME=	jsonschema
 PORTVERSION=	2.6.0
+PORTREVISION=	1
 CATEGORIES=	devel python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
@@ -15,7 +16,7 @@
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}vcversioner>0:devel/py-vcversioner@${FLAVOR}
 
 USES=		python
-USE_PYTHON=	autoplist distutils
+USE_PYTHON=	autoplist concurrent distutils
 NO_ARCH=	yes
 
 .include <bsd.port.pre.mk>