diff --git a/math/cimod/Makefile b/math/cimod/Makefile
index e8728f431abb..1f87b84d0e35 100644
--- a/math/cimod/Makefile
+++ b/math/cimod/Makefile
@@ -1,31 +1,31 @@
 PORTNAME=	cimod
 DISTVERSIONPREFIX=	v
-DISTVERSION=	1.5.1
+DISTVERSION=	1.6.1
 CATEGORIES=	math
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	C++ header-only library for a binary quadratic models
 WWW=		https://github.com/OpenJij/cimod
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	nlohmann-json>0:devel/nlohmann-json
 RUN_DEPENDS=	nlohmann-json>0:devel/nlohmann-json
 TEST_DEPENDS=	googletest>0:devel/googletest
 
 USES=		cmake:testing compiler:c++17-lang eigen:3,build,run
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	OpenJij
 
 CMAKE_ON=	CIMOD_INSTALL # doesn't do anything, see https://github.com/OpenJij/cimod/issues/103
 CMAKE_OFF=	CIMOD_TEST CIMOD_DOCS
 CMAKE_TESTING_ON=	CIMOD_TEST
 
 NO_ARCH=	yes
 
 do-install: # see https://github.com/OpenJij/cimod/issues/103
 	cd ${WRKSRC}/include && ${COPYTREE_SHARE} ${PORTNAME} ${STAGEDIR}${PREFIX}/include
 
 .include <bsd.port.mk>
diff --git a/math/cimod/distinfo b/math/cimod/distinfo
index 36c18c5ab7d4..f08395452165 100644
--- a/math/cimod/distinfo
+++ b/math/cimod/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1692765263
-SHA256 (OpenJij-cimod-v1.5.1_GH0.tar.gz) = d8e0b3306d187196d0f089a7231b0adb0d7a3c6b9e48e72f63c15457a4d3586e
-SIZE (OpenJij-cimod-v1.5.1_GH0.tar.gz) = 139855
+TIMESTAMP = 1705735532
+SHA256 (OpenJij-cimod-v1.6.1_GH0.tar.gz) = 4b7483786efb940a34759aa9ce6b1db8e03b1ae1b6e9b8e64585a21d5437ab06
+SIZE (OpenJij-cimod-v1.6.1_GH0.tar.gz) = 139720