diff --git a/orthanc-stl.changes b/orthanc-stl.changes
index a3b488b..f9f28cf 100644
--- a/orthanc-stl.changes
+++ b/orthanc-stl.changes
@@ -1,3 +1,13 @@
+-------------------------------------------------------------------
+Wed Dec 10 15:09:16 UTC 2025 - Axel Braun <axel.braun@gmx.de>
+
+- patch out libboost-system to fix build error
+
+-------------------------------------------------------------------
+Wed Sep 10 09:33:25 UTC 2025 - Axel Braun <axel.braun@gmx.de>
+
+- remove libboost_system-devel for TW (removed in boost 1.89) 
+
 -------------------------------------------------------------------
 Mon Jul 14 13:21:49 UTC 2025 - Axel Braun <axel.braun@gmx.de>
 
diff --git a/orthanc-stl.spec b/orthanc-stl.spec
index 36a5434..245627e 100644
--- a/orthanc-stl.spec
+++ b/orthanc-stl.spec
@@ -1,6 +1,7 @@
 #
-# spec file for package orthanc-neuro
+# spec file for package orthanc-stl
 #
+# Copyright (c) 2025 SUSE LLC and contributors
 # Copyright (c) 2025 Dr. Axel Braun <DocB@opensuse.org>
 #
 # All modifications and additions to the file contributed by third parties
@@ -37,8 +38,8 @@ BuildRequires:  gcc13-c++
 %else
 BuildRequires:  gcc-c++
 %endif
-BuildRequires:  googletest-devel
 BuildRequires:  dcmtk-devel
+BuildRequires:  googletest-devel
 BuildRequires:  jsoncpp-devel
 BuildRequires:  libboost_atomic-devel >= 1.66
 BuildRequires:  libboost_date_time-devel >= 1.66
@@ -46,14 +47,16 @@ BuildRequires:  libboost_filesystem-devel >= 1.66
 BuildRequires:  libboost_iostreams-devel >= 1.66
 BuildRequires:  libboost_locale-devel >= 1.66
 BuildRequires:  libboost_regex-devel >= 1.66
+%if 0%{?suse_version} <= 1600
 BuildRequires:  libboost_system-devel >= 1.66
+%endif
 BuildRequires:  libboost_thread-devel >= 1.66
 BuildRequires:  libcurl-devel
 BuildRequires:  libuuid-devel
 BuildRequires:  orthanc-devel
 BuildRequires:  orthanc-source
 # Only needed for Leap 15.6
-%if 0%{?suse_version} == 1500 
+%if 0%{?suse_version} == 1500
 BuildRequires:  python311
 %endif
 BuildRequires:  unzip
@@ -80,6 +83,9 @@ cd ..
 mkdir -p JavaScriptLibraries/
 unzip %{S:6} -d JavaScriptLibraries
 
+# boost komponente system entfernen
+sed -i 's/\(find_package([^)]* \)system\(.*\)/\1\2/g' CMakeLists.txt
+
 %build
 %if 0%{?suse_version} == 1500 && 0%{?sle_version} > 150200
 export CC=gcc-13