diff --git a/M2/cmake/build-libraries.cmake b/M2/cmake/build-libraries.cmake
index e96138cc825..e09ae01a32f 100644
--- a/M2/cmake/build-libraries.cmake
+++ b/M2/cmake/build-libraries.cmake
@@ -517,13 +517,13 @@ _ADD_COMPONENT_DEPENDENCY(programs msolve "gmp;mpfr;flint" MSOLVE_FOUND)
 # https://numpi.dm.unipi.it/software/mpsolve
 # Known issue: tests don't work with static library
 ExternalProject_Add(build-mpsolve
-  URL               ${M2_SOURCE_URL}/mpsolve-3.2.1.tar.gz
-  URL_HASH          SHA256=3d11428ae9ab2e020f24cabfbcd9e4d9b22ec572cf70af0d44fe8dae1d51e78e
+  URL               https://numpi.dm.unipi.it/wp-content/uploads/2025/03/mpsolve-3.2.2.tgz
+  URL_HASH          SHA256=c951b37ad0bf0761da495544453ac470e6d716a208577599d78ce6f0bfd30317
   PREFIX            libraries/mpsolve
   SOURCE_DIR        libraries/mpsolve/build
   DOWNLOAD_DIR      ${CMAKE_SOURCE_DIR}/BUILD/tarfiles
   BUILD_IN_SOURCE   ON
-  PATCH_COMMAND     patch --batch -p1 < ${CMAKE_SOURCE_DIR}/libraries/mpsolve/patch-3.2.1
+  PATCH_COMMAND     patch --batch -p1 < ${CMAKE_SOURCE_DIR}/libraries/mpsolve/patch-3.2.2
   CONFIGURE_COMMAND autoreconf -vif
             COMMAND ${CONFIGURE} --prefix=${M2_HOST_PREFIX}
                       #-C --cache-file=${CONFIGURE_CACHE}
diff --git a/M2/libraries/mpsolve/Makefile.in b/M2/libraries/mpsolve/Makefile.in
index b8604b3816f..90243453bda 100644
--- a/M2/libraries/mpsolve/Makefile.in
+++ b/M2/libraries/mpsolve/Makefile.in
@@ -1,13 +1,12 @@
 VPATH = @srcdir@
 HOMEPAGE = https://numpi.dm.unipi.it/software/mpsolve 
-VERSION = 3.2.1
-URL = https://macaulay2.com/Downloads/OtherSourceCode
+VERSION = 3.2.2
+TARFILE = $(LIBNAME)-$(VERSION).tgz
+URL = https://numpi.dm.unipi.it/wp-content/uploads/2025/03
 
 # obtained from https://numpi.dm.unipi.it/_media/software/mpsolve
 #               https://numpi.dm.unipi.it/_media/software/mpsolve/mpsolve-3.2.1.tar.gz
 
-# the patch disables the python tests, which don't know that the name of the
-# sharable library in Mac OS is libmps.3.dylib instead of libmps.so.3
 PATCHFILE = @abs_srcdir@/patch-$(VERSION)
 
 LICENSEFILES = README
diff --git a/M2/libraries/mpsolve/patch-3.2.2 b/M2/libraries/mpsolve/patch-3.2.2
new file mode 100644
index 00000000000..a6448f749d8
--- /dev/null
+++ b/M2/libraries/mpsolve/patch-3.2.2
@@ -0,0 +1,66 @@
+From 260432c9d1002261f60159d0520af7862d4471ed Mon Sep 17 00:00:00 2001
+From: Doug Torrance <dtorrance@piedmont.edu>
+Date: Fri, 8 Aug 2025 14:05:58 -0400
+Subject: [PATCH] Include cmath in C++ before defining isnan macro
+
+Otherwise we get the following compile error in macOS:
+
+    /Applications/Xcode_15.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:587:17: error: expected unqualified-id
+        return std::isnan(__lcpp_x);
+                    ^
+    ../../include/mps/types.h:27:3: note: expanded from macro 'isnan'
+      (sizeof(x) == sizeof(long double) ? isnan_ld (x) \
+      ^
+---
+ include/mps/types.h | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+From 449d608b360fea0056049d7f8e874ea022fadab5 Mon Sep 17 00:00:00 2001
+From: Doug Torrance <dtorrance@piedmont.edu>
+Date: Sat, 9 Aug 2025 09:49:08 -0400
+Subject: [PATCH] Use CPPFLAGS instead of CFLAGS for specifying header
+ directories
+
+CPPFLAGS appear before CFLAGS, so if the user passes some directories
+manually using CPPFLAGS, they will appear first.  This is a problem if
+these directories contain older versions of the mpsolve headers.  We
+want to ensure that the current versions are found first.
+---
+ src/mpsolve/Makefile.am | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+--- a/include/mps/types.h
++++ mpsolve-3.2.2/include/mps/types.h
+@@ -21,7 +21,11 @@ typedef bool mps_boolean;
+ typedef int mps_debug_level;
+ 
+ /* Handle systems where isnan and isinf are not available */
+-#include <math.h>
++#ifdef __cplusplus
++  #include <cmath>
++#else
++  #include <math.h>
++#endif
+ #ifndef isnan
+           # define isnan(x) \
+   (sizeof(x) == sizeof(long double) ? isnan_ld (x) \
+--- a/src/mpsolve/Makefile.am
++++ mpsolve-3.2.2/src/mpsolve/Makefile.am
+@@ -6,10 +6,12 @@ man_MANS = ${builddir}/mpsolve.1
+ 
+ EXTRA_DIST = mpsolve.1
+ 
+-mpsolve_CFLAGS = \
++mpsolve_CPPFLAGS = \
+         -I${top_srcdir}/include \
+ 	-I. \
+-	-I${top_builddir}/include \
++	-I${top_builddir}/include
++
++mpsolve_CFLAGS = \
+ 	$(GMP_CFLAGS) \
+ 	$(GTK_CFLAGS) \
+ 	$(PTHREAD_CFLAGS) \
+-- 
+2.43.0
+