diff --git a/baselibs.conf b/baselibs.conf
index 25c034c..96a4afc 100644
--- a/baselibs.conf
+++ b/baselibs.conf
@@ -1 +1 @@
-libgupnp-1_2-0
+libgupnp-1_2-1
diff --git a/gupnp.changes b/gupnp.changes
index c918891..e5fb687 100644
--- a/gupnp.changes
+++ b/gupnp.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Nov 10 09:03:23 UTC 2021 - Yifan Jiang <yfjiang@suse.com>
+
+- Bump soname to 1_2-1 reflecting real the library version. Obsolete
+  packages had the mismatched version number.
+
 -------------------------------------------------------------------
 Mon Sep 20 11:27:43 UTC 2021 - Dominique Leuenberger <dimstar@opensuse.org>
 
diff --git a/gupnp.spec b/gupnp.spec
index bd13638..b7ebbf8 100644
--- a/gupnp.spec
+++ b/gupnp.spec
@@ -17,7 +17,7 @@
 
 
 # When bumping soname, do not forget to bump in baselibs.conf too.
-%define soname 1_2-0
+%define soname 1_2-1
 %define sover 1.2
 
 Name:           gupnp
@@ -42,6 +42,7 @@ BuildRequires:  pkgconfig(libsoup-2.4) >= 2.48.0
 BuildRequires:  pkgconfig(libxml-2.0)
 BuildRequires:  pkgconfig(uuid)
 BuildRequires:  pkgconfig(vapigen)
+Obsoletes:      (libgupnp-1_2-0 with libgupnp-1.2.so.1%?{_isa})
 
 %description
 GUPnP implements the UPnP specification: resource announcement and