Index: head/biology/prodigy-lig/Makefile
===================================================================
--- head/biology/prodigy-lig/Makefile	(revision 538675)
+++ head/biology/prodigy-lig/Makefile	(revision 538676)
@@ -1,26 +1,26 @@
 # $FreeBSD$
 
 PORTNAME=	prodigy-lig
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.0.0-3
 PORTREVISION=	1
 DISTVERSIONSUFFIX=	-g152ac59
 CATEGORIES=	biology python
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Prediction of protein-small molecule binding affinities
 
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	${PYNUMPY} \
 		${PYTHON_PKGNAMEPREFIX}biopython>0:biology/py-biopython@${PY_FLAVOR}
 
-USES=		gmake python:3.5+
+USES=		gmake python:3.6+
 USE_GITHUB=	yes
 GH_ACCOUNT=	haddocking
 USE_PYTHON=	distutils noflavors autoplist
 
 NO_ARCH=	yes
 
 .include <bsd.port.mk>
Index: head/science/py-MDAnalysis/Makefile
===================================================================
--- head/science/py-MDAnalysis/Makefile	(revision 538675)
+++ head/science/py-MDAnalysis/Makefile	(revision 538676)
@@ -1,33 +1,33 @@
 # $FreeBSD$
 
 PORTNAME=	MDAnalysis
 DISTVERSION=	0.19.2
 PORTREVISION=	2
 CATEGORIES=	science python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Python library to analyze molecular dynamics trajectories
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	${PYNUMPY}
 RUN_DEPENDS=	${PYNUMPY} \
 		${PYTHON_PKGNAMEPREFIX}biopython>=1.71:biology/py-biopython@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}duecredit>0:textproc/py-duecredit@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}GridDataFormats>=0.4.0:math/py-GridDataFormats@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}gsd>=1.4.0:science/py-gsd@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}joblib>0:devel/py-joblib@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}matplotlib>=1.5.1:math/py-matplotlib@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}mmtf-python>=1.0.0:science/py-mmtf-python@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}mock>0:devel/py-mock@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}networkx>=1.0:math/py-networkx@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}scipy>=1.0.0:science/py-scipy@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}six>=1.4.0:devel/py-six@${PY_FLAVOR}
 
-USES=		compiler:c++11-lang python
+USES=		compiler:c++11-lang python:3.6+
 USE_PYTHON=	distutils autoplist
 
 .include <bsd.port.mk>
Index: head/science/py-MDAnalysisTests/Makefile
===================================================================
--- head/science/py-MDAnalysisTests/Makefile	(revision 538675)
+++ head/science/py-MDAnalysisTests/Makefile	(revision 538676)
@@ -1,27 +1,27 @@
 # $FreeBSD$
 
 PORTNAME=	MDAnalysisTests
 DISTVERSION=	0.19.2
 PORTREVISION=	2
 CATEGORIES=	science python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Test code and the trajectory data for test cases of MDAnalysis
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 RUN_DEPENDS=	${PYNUMPY} \
 		${PYTHON_PKGNAMEPREFIX}MDAnalysis>0:science/py-MDAnalysis@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}pytest>=3.1.2:devel/py-pytest@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}hypothesis>0:devel/py-hypothesis@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}psutil>=4.0.2:sysutils/py-psutil@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}mock>=2.0.0:devel/py-mock@${PY_FLAVOR}
 
-USES=		python
+USES=		python:3.6+
 USE_PYTHON=	distutils autoplist
 NO_ARCH=	yes
 
 .include <bsd.port.mk>