diff --git a/math/rumur/Makefile b/math/rumur/Makefile
index b0c10f58e492..c6384e80949c 100644
--- a/math/rumur/Makefile
+++ b/math/rumur/Makefile
@@ -1,35 +1,35 @@
 PORTNAME=	rumur
 DISTVERSIONPREFIX=	v
-DISTVERSION=	2026.03.11
+DISTVERSION=	2026.09.13
 CATEGORIES=	math
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Model checker, a formal verification tool for state machines
 WWW=		https://github.com/Smattr/rumur
 
 LICENSE=	PD
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 LIB_DEPENDS=	libgmpxx.so:math/gmp
 
 USES=		bison cmake compiler:c++11-lang python:build shebangfix
 USE_LDCONFIG=	yes
 
 SHEBANG_FILES=	rumur/src/rumur-run
 SHEBANG_GLOB=	*.py
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	Smattr
 
 CMAKE_ON=	BUILD_SHARED_LIBS
 CMAKE_ARGS=	BISON_EXECUTABLE:STRING=${LOCALBASE}/bin/bison
 
 BINARY_ALIAS=	python3=${PYTHON_CMD}
 
 do-test: # the test command outputs only in the end of the run
 	@cd ${BUILD_WRKSRC} && \
 		${SETENV} ${CONFIGURE_ENV} ${CMAKE_BIN} --build . --target check
 
 # tests as of 2025.01.05: 2 failed, 5381 passed, 238 skipped in 1032.03s (0:17:12), see https://github.com/Smattr/rumur/issues/289
 
 .include <bsd.port.mk>
diff --git a/math/rumur/distinfo b/math/rumur/distinfo
index a94d80c516c9..5db5dfb20bb9 100644
--- a/math/rumur/distinfo
+++ b/math/rumur/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1773511840
-SHA256 (Smattr-rumur-v2026.03.11_GH0.tar.gz) = 62c05ed7b73dc31cea80bdcab3ec0ef7cdfe47af3cc03c5845d521b0494fb15d
-SIZE (Smattr-rumur-v2026.03.11_GH0.tar.gz) = 355190
+TIMESTAMP = 1789694801
+SHA256 (Smattr-rumur-v2026.09.13_GH0.tar.gz) = f5cd322cae6af1473ce31ece08ff15e028f37f25da15973d88b87a3c77b995cd
+SIZE (Smattr-rumur-v2026.09.13_GH0.tar.gz) = 378555
diff --git a/math/rumur/files/patch-CMakeLists.txt b/math/rumur/files/patch-CMakeLists.txt
new file mode 100644
index 000000000000..25e5c311edee
--- /dev/null
+++ b/math/rumur/files/patch-CMakeLists.txt
@@ -0,0 +1,11 @@
+--- CMakeLists.txt.orig	2026-09-18 01:29:25 UTC
++++ CMakeLists.txt
+@@ -162,7 +162,7 @@ add_custom_target(check
+     "CPLUS_INCLUDE_PATH=${TEST_INC}"
+     "LIBRARY_PATH=${CMAKE_CURRENT_BINARY_DIR}/librumur"
+     "LD_LIBRARY_PATH=${CMAKE_CURRENT_BINARY_DIR}/librumur"
+-    python3 -m pytest --capture=no
++    python3 -m pytest --disable-plugin-autoload --capture=no
+       --override-ini=cache_dir=${CMAKE_CURRENT_BINARY_DIR} --verbose --verbose
+       ${CMAKE_CURRENT_SOURCE_DIR}/tests/tests.py
+   COMMENT "Running test suite"
diff --git a/math/rumur/pkg-plist b/math/rumur/pkg-plist
index 703b92ac1ec9..7ae3178816c7 100644
--- a/math/rumur/pkg-plist
+++ b/math/rumur/pkg-plist
@@ -1,59 +1,63 @@
 bin/murphi-format
 bin/murphi2c
 bin/murphi2murphi
 bin/murphi2smv
 bin/murphi2uclid
 bin/murphi2xml
 bin/rumur
 bin/rumur-run
 include/rumur/Boolean.h
 include/rumur/Comment.h
 include/rumur/Decl.h
 include/rumur/Expr.h
 include/rumur/Function.h
 include/rumur/Model.h
 include/rumur/Node.h
 include/rumur/Number.h
 include/rumur/Property.h
 include/rumur/Ptr.h
 include/rumur/Rule.h
 include/rumur/Stmt.h
 include/rumur/Symtab.h
 include/rumur/TypeExpr.h
 include/rumur/except.h
 include/rumur/indexer.h
 include/rumur/location.hh
 include/rumur/parse.h
 include/rumur/parser.yy.hh
 include/rumur/position.hh
 include/rumur/resolve-symbols.h
 include/rumur/rumur.h
 include/rumur/sanitise_rule_names.h
 include/rumur/scanner.h
 include/rumur/stack.hh
 include/rumur/traverse.h
 include/rumur/validate.h
 include/rumur/version.h
 lib/cmake/rumur/librumurConfig-%%CMAKE_BUILD_TYPE%%.cmake
 lib/cmake/rumur/librumurConfig.cmake
 lib/cmake/rumur/rumurConfig.cmake
 lib/librumur.so
 share/man/man1/murphi-format.1.gz
 share/man/man1/murphi2c.1.gz
 share/man/man1/murphi2murphi.1.gz
 share/man/man1/murphi2smv.1.gz
 share/man/man1/murphi2uclid.1.gz
 share/man/man1/murphi2xml.1.gz
 share/man/man1/rumur-run.1.gz
 share/man/man1/rumur.1.gz
 %%DATADIR%%/lib/README.rst
 %%DATADIR%%/lib/_list
 %%DATADIR%%/lib/_set
 %%DATADIR%%/lib/v2025.01.04/list
 %%DATADIR%%/lib/v2025.01.05/list
 %%DATADIR%%/lib/v2025.02.02/_list
 %%DATADIR%%/lib/v2025.02.02/_set
 %%DATADIR%%/lib/v2025.08.31/_list
 %%DATADIR%%/lib/v2025.08.31/_set
 %%DATADIR%%/lib/v2026.03.11/_list
 %%DATADIR%%/lib/v2026.03.11/_set
+%%DATADIR%%/lib/v2026.08.30/_list
+%%DATADIR%%/lib/v2026.08.30/_set
+%%DATADIR%%/lib/v2026.09.13/_list
+%%DATADIR%%/lib/v2026.09.13/_set