diff --git a/icu-73.2-ICU-22132.patch b/icu-73.2-ICU-22132.patch
new file mode 100644
index 0000000..3b93c92
--- /dev/null
+++ b/icu-73.2-ICU-22132.patch
@@ -0,0 +1,25 @@
+diff -u a/i18n/vtzone.cpp a/i18n/vtzone.cpp
+--- a/i18n/vtzone.cpp	2023-07-14 09:05:38.000000000 +0100
++++ b/i18n/vtzone.cpp	2023-07-14 09:05:38.000000000 +0100
+@@ -1735,14 +1735,14 @@
+             }
+         }
+     } else {
+-        UnicodeString icutzprop;
+-        UVector customProps(nullptr, uhash_compareUnicodeString, status);
++        UVector customProps(uprv_deleteUObject, uhash_compareUnicodeString, status);
+         if (olsonzid.length() > 0 && icutzver.length() > 0) {
+-            icutzprop.append(olsonzid);
+-            icutzprop.append(u'[');
+-            icutzprop.append(icutzver);
+-            icutzprop.append(u']');
+-            customProps.addElement(&icutzprop, status);
++            LocalPointer<UnicodeString> icutzprop(new UnicodeString(ICU_TZINFO_PROP), status);
++            icutzprop->append(olsonzid);
++            icutzprop->append(u'[');
++            icutzprop->append(icutzver);
++            icutzprop->append(u']');
++            customProps.adoptElement(icutzprop.orphan(), status);
+         }
+         writeZone(writer, *tz, &customProps, status);
+     }
\ No newline at end of file
diff --git a/icu.spec b/icu.spec
index 80cdb3f..dee0ca8 100644
--- a/icu.spec
+++ b/icu.spec
@@ -4,7 +4,7 @@
 
 Name:          icu
 Version:       73.2
-Release:       1mamba
+Release:       2mamba
 Summary:       Set of C/C++ and Java libraries for Unicode support
 Group:         System/Libraries
 Vendor:        openmamba
@@ -12,7 +12,7 @@ Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
 URL:           https://www.icu-project.org
 Source:        https://github.com/unicode-org/icu.git/release-%{gitver}/icu-%{version}.tar.bz2
-#Source:        http://download.icu-project.org/files/icu4c/%{version}/icu4c-%{pkgver}-src.tgz
+Patch0:        icu-73.2-ICU-22132.patch
 License:       MIT
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
@@ -52,6 +52,9 @@ This package contains static libraries and header files need for development.
 
 %prep
 %setup -q
+cd icu4c/source
+%patch 0 -p1 -b .ICU-22132
+cd ../..
 
 %build
 cd icu4c/source
@@ -123,6 +126,9 @@ rm -f %{buildroot}%{_datadir}/icu/%{version}/license.html
 %{_libdir}/pkgconfig/icu-*.pc
 
 %changelog
+* Fri Sep 29 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 73.2-2mamba
+- added upstream patch to fix problems seen with thunderbird >= 115 (see https://bugzilla.mozilla.org/show_bug.cgi?id=1843007 )
+
 * Wed Jun 14 2023 Automatic Build System <autodist@mambasoft.it> 73.2-1mamba
 - automatic version update by autodist