diff --git a/devel/mimalloc/Makefile b/devel/mimalloc/Makefile
index 3aa4ac5059c1..1d3385f669fa 100644
--- a/devel/mimalloc/Makefile
+++ b/devel/mimalloc/Makefile
@@ -1,26 +1,26 @@
 PORTNAME=	mimalloc
 DISTVERSIONPREFIX=	v
-DISTVERSION=	2.1.8
+DISTVERSION=	3.0.1
 CATEGORIES=	devel
 
 MAINTAINER=	ehaupt@FreeBSD.org
 COMMENT=	General-purpose allocator with excellent performance characteristics
 WWW=		https://github.com/microsoft/mimalloc
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 USES=		cmake:testing compiler:c++17-lang pathfix
 USE_GITHUB=	yes
 GH_ACCOUNT=	microsoft
 USE_LDCONFIG=	yes
 
 CMAKE_ON=	MI_INSTALL_TOPLEVEL
 CMAKE_OFF=	MI_BUILD_OBJECT MI_BUILD_TESTS
 
 CMAKE_TESTING_ON=	MI_BUILD_TESTS
 
 # ci pipeline creates transient tags
 PORTSCOUT=	ignore:1
 
 .include <bsd.port.mk>
diff --git a/devel/mimalloc/distinfo b/devel/mimalloc/distinfo
index 08d69587a3be..d1b7a49f47cd 100644
--- a/devel/mimalloc/distinfo
+++ b/devel/mimalloc/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1735990751
-SHA256 (microsoft-mimalloc-v2.1.8_GH0.tar.gz) = 4d7e771b51ba0d3c4a5850d3f7f7f82c1b04af318e1351553f46aa3336439540
-SIZE (microsoft-mimalloc-v2.1.8_GH0.tar.gz) = 1276091
+TIMESTAMP = 1736781220
+SHA256 (microsoft-mimalloc-v3.0.1_GH0.tar.gz) = 6a514ae31254b43e06e2a89fe1cbc9c447fdbf26edc6f794f3eb722f36e28261
+SIZE (microsoft-mimalloc-v3.0.1_GH0.tar.gz) = 1281782
diff --git a/devel/mimalloc/files/patch-CMakeLists.txt b/devel/mimalloc/files/patch-CMakeLists.txt
index 9c0f325ff0f1..a6bc3850f094 100644
--- a/devel/mimalloc/files/patch-CMakeLists.txt
+++ b/devel/mimalloc/files/patch-CMakeLists.txt
@@ -1,13 +1,13 @@
---- CMakeLists.txt.orig	2023-04-03 19:32:28 UTC
+--- CMakeLists.txt.orig	2025-01-13 15:16:06 UTC
 +++ CMakeLists.txt
-@@ -353,8 +353,8 @@ if(MI_TRACK_ASAN)
+@@ -513,8 +513,8 @@ string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_
    set(mi_basename "${mi_basename}-asan")
  endif()
  string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LC)
 -if(NOT(CMAKE_BUILD_TYPE_LC MATCHES "^(release|relwithdebinfo|minsizerel|none)$"))
 -  set(mi_basename "${mi_basename}-${CMAKE_BUILD_TYPE_LC}") #append build type (e.g. -debug) if not a release version
 +if(NOT(CMAKE_BUILD_TYPE_LC MATCHES "^(debug|release|relwithdebinfo|minsizerel|none)$"))
 +  set(mi_basename "${mi_basename}-${CMAKE_BUILD_TYPE_LC}") #append build type if not a release version or debug
  endif()
  
  if(MI_BUILD_SHARED)
diff --git a/devel/mimalloc/files/patch-src_prim_unix_prim.c b/devel/mimalloc/files/patch-src_prim_unix_prim.c
new file mode 100644
index 000000000000..53ee443d4dee
--- /dev/null
+++ b/devel/mimalloc/files/patch-src_prim_unix_prim.c
@@ -0,0 +1,12 @@
+--- src/prim/unix/prim.c.orig	2025-01-04 04:21:48 UTC
++++ src/prim/unix/prim.c
+@@ -201,7 +201,8 @@ static void* unix_mmap_prim(void* addr, size_t size, s
+   void* p = NULL;
+   #if defined(MAP_ALIGNED)  // BSD
+   if (addr == NULL && try_alignment > 1 && (try_alignment % _mi_os_page_size()) == 0) {
+-    size_t n = mi_bsr(try_alignment);
++    size_t idx;
++    size_t n = mi_bsr(try_alignment, &idx);
+     if (((size_t)1 << n) == try_alignment && n >= 12 && n <= 30) {  // alignment is a power of 2 and 4096 <= alignment <= 1GiB
+       p = mmap(addr, size, protect_flags, flags | MAP_ALIGNED(n), fd, 0);
+       if (p==MAP_FAILED || !_mi_is_aligned(p,try_alignment)) {
diff --git a/devel/mimalloc/pkg-plist b/devel/mimalloc/pkg-plist
index 7b9cc29f8afc..780f28538d8f 100644
--- a/devel/mimalloc/pkg-plist
+++ b/devel/mimalloc/pkg-plist
@@ -1,12 +1,12 @@
 include/mimalloc-new-delete.h
 include/mimalloc-override.h
 include/mimalloc.h
 lib/cmake/mimalloc/mimalloc-%%CMAKE_BUILD_TYPE%%.cmake
 lib/cmake/mimalloc/mimalloc-config-version.cmake
 lib/cmake/mimalloc/mimalloc-config.cmake
 lib/cmake/mimalloc/mimalloc.cmake
 lib/libmimalloc.a
 lib/libmimalloc.so
-lib/libmimalloc.so.2
-lib/libmimalloc.so.2.1
+lib/libmimalloc.so.3
+lib/libmimalloc.so.3.0
 libdata/pkgconfig/mimalloc.pc