diff --git a/orthanc-mysql.changes b/orthanc-mysql.changes
index 6f4d66b..e17450d 100644
--- a/orthanc-mysql.changes
+++ b/orthanc-mysql.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Sep 10 09:26:12 UTC 2025 - Axel Braun <axel.braun@gmx.de>
+
+- remove libboost_system-devel for TW (removed in boost 1.89)
+
 -------------------------------------------------------------------
 Sat May 17 06:46:58 UTC 2025 - Axel Braun <axel.braun@gmx.de>
 
diff --git a/orthanc-mysql.spec b/orthanc-mysql.spec
index 6a711a3..dca0d4c 100644
--- a/orthanc-mysql.spec
+++ b/orthanc-mysql.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package orthanc-mysql
 #
-# Copyright (c) 2025 SUSE LLC
+# Copyright (c) 2025 SUSE LLC and contributors
 # Copyright (c) 2020-2024 Dr. Axel Braun
 #
 # All modifications and additions to the file contributed by third parties
@@ -42,7 +42,9 @@ 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:  libmysqld-devel