Index: head/devel/py-cluster/Makefile
===================================================================
--- head/devel/py-cluster/Makefile	(revision 469884)
+++ head/devel/py-cluster/Makefile	(revision 469885)
@@ -1,26 +1,26 @@
 # $FreeBSD$
 
 PORTNAME=	cluster
-PORTVERSION=	1.4.0
+PORTVERSION=	1.4.1
 DISTVERSIONPREFIX=	v
 CATEGORIES=	devel python
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	dbaio@FreeBSD.org
 COMMENT=	Create several groups (clusters) of objects from a list in Python
 
 LICENSE=	LGPL21+
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 USES=		python
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	exhuma
 GH_PROJECT=	python-cluster
 
-USE_PYTHON=	autoplist distutils
+USE_PYTHON=	autoplist concurrent distutils
 NO_ARCH=	yes
 
 PORTSCOUT=	skipv:regression
 
 .include <bsd.port.mk>
Index: head/devel/py-cluster/distinfo
===================================================================
--- head/devel/py-cluster/distinfo	(revision 469884)
+++ head/devel/py-cluster/distinfo	(revision 469885)
@@ -1,3 +1,3 @@
-TIMESTAMP = 1495891146
-SHA256 (exhuma-python-cluster-v1.4.0_GH0.tar.gz) = 384a9df23226b3f72c97ea0f020da85f9370c9d51ed0d08e31bf16a0af4e2d95
-SIZE (exhuma-python-cluster-v1.4.0_GH0.tar.gz) = 49454
+TIMESTAMP = 1526302703
+SHA256 (exhuma-python-cluster-v1.4.1_GH0.tar.gz) = e5f4479e618618d1e2866892cd85306e6377e738e057eeb12194359c0a563cce
+SIZE (exhuma-python-cluster-v1.4.1_GH0.tar.gz) = 51859