diff --git a/math/rumur/Makefile b/math/rumur/Makefile
index b3697ddd2330..cb927295c530 100644
--- a/math/rumur/Makefile
+++ b/math/rumur/Makefile
@@ -1,30 +1,30 @@
 PORTNAME=	rumur
 DISTVERSIONPREFIX=	v
-DISTVERSION=	2021.09.29
+DISTVERSION=	2021.12.27
 CATEGORIES=	math
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Model checker, a formal verification tool for state machines
 
 LICENSE=	PD
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 LIB_DEPENDS=	libgmpxx.so:math/gmp
 
 USES=		bison cmake compiler:c++11-lang python:build shebangfix
 SHEBANG_FILES=	rumur/src/rumur-run
 SHEBANG_GLOB=	*.py
 USE_GITHUB=	yes
 GH_ACCOUNT=	Smattr
 USE_LDCONFIG=	yes
 
 CMAKE_ON=	BUILD_SHARED_LIBS
 CMAKE_ARGS=	BISON_EXECUTABLE:STRING=${LOCALBASE}/bin/bison
 
 BINARY_ALIAS=	python3=${PYTHON_CMD}
 
 do-test:
 	@cd ${BUILD_WRKSRC} && \
 		${SETENV} ${CONFIGURE_ENV} ${CMAKE_BIN} --build . --target check
 
 .include <bsd.port.mk>
diff --git a/math/rumur/distinfo b/math/rumur/distinfo
index b25e081a773f..57fef99f5c8c 100644
--- a/math/rumur/distinfo
+++ b/math/rumur/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1633073535
-SHA256 (Smattr-rumur-v2021.09.29_GH0.tar.gz) = e61eb820375168955da24dd29e03033991695606263fe040566d20158c3c8cde
-SIZE (Smattr-rumur-v2021.09.29_GH0.tar.gz) = 313520
+TIMESTAMP = 1642036263
+SHA256 (Smattr-rumur-v2021.12.27_GH0.tar.gz) = ba6db80eaa8220c371838bb6ee7d444f7ebc136ad5f2da35bf162e81f72318e2
+SIZE (Smattr-rumur-v2021.12.27_GH0.tar.gz) = 313524