diff --git a/math/lean4/Makefile b/math/lean4/Makefile
index 078d42595304..6eb36f82225d 100644
--- a/math/lean4/Makefile
+++ b/math/lean4/Makefile
@@ -1,46 +1,46 @@
 PORTNAME=	lean4
 DISTVERSIONPREFIX=	v
-DISTVERSION=	4.9.0
+DISTVERSION=	4.9.1
 CATEGORIES=	math lang devel # lean4 is primarily a math theorem prover, but it is also a language and a development environment
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Theorem prover and functional language for math (new gen)
 WWW=		https://lean-lang.org/
 
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BROKEN_armv7=	compilation fails: ../../.build/stage1/lib/temp/Init/Coe.depend: No such file or directory
 BROKEN_i386=	linking fails: INTERNAL PANIC: out of memory (during: Linking runLinter)
 
 BUILD_DEPENDS=	bash:shells/bash
 LIB_DEPENDS=	libgmp.so:math/gmp
 
 USES=		cmake:noninja,testing compiler:c++14-lang gmake python:build # ninja fails + gmake scripts are included in the project
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	leanprover
 
 CFLAGS+=	-fPIC
 CXXFLAGS+=	-fPIC
 
 BINARY_ALIAS=	make=${GMAKE} python=${PYTHON_CMD}
 
 post-install:
 	# remove empty dirs
 	@${FIND} ${STAGEDIR}${DATADIR} -type d -empty -delete
 	# remove stray files
 	@${RM} ${STAGEDIR}${PREFIX}/LICENSE*
 	# strip binaries
 	@cd ${STAGEDIR}${PREFIX} && ${STRIP_CMD} \
 		bin/lake \
 		bin/lean \
 		bin/leanc \
 		lib/lean/libInit_shared.so \
 		lib/lean/libleanshared.so
 
 # 2 test failures:
 # https://github.com/leanprover/lean4/issues/4396: The test leanlaketest_old times out
 # https://github.com/leanprover/lean4/issues/4397: The test leanlaketest_serve fails: error: unexpected identifier; expected command
 
 .include <bsd.port.mk>
diff --git a/math/lean4/distinfo b/math/lean4/distinfo
index 2fcae32c6584..395168f7c42c 100644
--- a/math/lean4/distinfo
+++ b/math/lean4/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1720249428
-SHA256 (leanprover-lean4-v4.9.0_GH0.tar.gz) = f59b7a782bd7e918b35a133a954094f0e39e344ffef06689a1c53ae97ae8d769
-SIZE (leanprover-lean4-v4.9.0_GH0.tar.gz) = 22768229
+TIMESTAMP = 1720597727
+SHA256 (leanprover-lean4-v4.9.1_GH0.tar.gz) = 713e41ec71a9e9030e6f46cc5dbb5aef30ac1887dfe5faa5a054c0a2f0613b1e
+SIZE (leanprover-lean4-v4.9.1_GH0.tar.gz) = 22771989