diff --git a/math/kamis/Makefile b/math/kamis/Makefile
index 26e3a11a13ac2..1da88651e2e7a 100644
--- a/math/kamis/Makefile
+++ b/math/kamis/Makefile
@@ -1,7 +1,6 @@
 PORTNAME=	kamis
 DISTVERSIONPREFIX=	v
-DISTVERSION=	2.0-19
-DISTVERSIONSUFFIX=	-g254fd16
+DISTVERSION=	2.1
 CATEGORIES=	math
 
 MAINTAINER=	yuri@FreeBSD.org
diff --git a/math/kamis/distinfo b/math/kamis/distinfo
index a91804a269d6e..fa6da1acdb1e3 100644
--- a/math/kamis/distinfo
+++ b/math/kamis/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1656665299
-SHA256 (KarlsruheMIS-KaMIS-v2.0-19-g254fd16_GH0.tar.gz) = 73d2b5c2808b2a15b9b8f3833a8d56f8e94fe1da8d6afed581f539f4533dcd70
-SIZE (KarlsruheMIS-KaMIS-v2.0-19-g254fd16_GH0.tar.gz) = 783177
+TIMESTAMP = 1703096854
+SHA256 (KarlsruheMIS-KaMIS-v2.1_GH0.tar.gz) = 22a650ad7ff243f98f871d0e4c522977bd351f23583186d3fc1a1216350a6173
+SIZE (KarlsruheMIS-KaMIS-v2.1_GH0.tar.gz) = 782448
diff --git a/math/kamis/files/patch-wmis_CMakeLists.txt b/math/kamis/files/patch-wmis_CMakeLists.txt
index d528aa714b661..0cc3bbd2bf4e0 100644
--- a/math/kamis/files/patch-wmis_CMakeLists.txt
+++ b/math/kamis/files/patch-wmis_CMakeLists.txt
@@ -1,13 +1,13 @@
 - workaround for https://github.com/KarlsruheMIS/KaMIS/issues/30
 
---- wmis/CMakeLists.txt.orig	2022-07-13 03:12:06 UTC
+--- wmis/CMakeLists.txt.orig	2023-11-28 08:57:29 UTC
 +++ wmis/CMakeLists.txt
-@@ -5,7 +5,7 @@ if (NOT CMAKE_BUILD_TYPE)
-     set(CMAKE_BUILD_TYPE Release) 
- endif (NOT CMAKE_BUILD_TYPE)
+@@ -20,7 +20,7 @@ if(COMPILER_SUPPORTS_OMIT_FRAME_POINTER)
+   add_compile_options(-fno-omit-frame-pointer)
+ endif()
  
--set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14 -fno-omit-frame-pointer -march=native -DNDEBUG -fPIC -O3 ")
-+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14 -fno-omit-frame-pointer -DNDEBUG -fPIC -O3 ")
- 
- CHECK_CXX_COMPILER_FLAG(-Wno-unused-value COMPILER_SUPPORTS_NOUNUSED)
- if(COMPILER_SUPPORTS_NOUNUSED)
+-CHECK_CXX_COMPILER_FLAG(-march=native COMPILER_SUPPORTS_MARCH_NATIVE)
++#CHECK_CXX_COMPILER_FLAG(-march=native COMPILER_SUPPORTS_MARCH_NATIVE)
+ if(COMPILER_SUPPORTS_MARCH_NATIVE)
+   add_compile_options(-march=native)
+ endif()