diff --git a/libgtkmm.spec b/libgtkmm.spec
index 72d3db7..d62da9e 100644
--- a/libgtkmm.spec
+++ b/libgtkmm.spec
@@ -1,15 +1,15 @@
 %define        majversion  %(echo %version | cut -d. -f 1-2)
-%define        apiver  %(echo %version | cut -d. -f 1-2)
+%define        apiver  %(echo %version | cut -d. -f 1).0
 
 Name:          libgtkmm
-Version:       4.0.1
+Version:       4.2.0
 Release:       1mamba
 Summary:       gtkmm is the official C++ interface for the popular GUI library GTK+
 Group:         System/Libraries
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           https://gtkmm.sourceforge.net
+URL:           https://gtkmm.org/en/
 Source:        https://download.gnome.org/sources/gtkmm/%{majversion}/gtkmm-%{version}.tar.xz
 License:       LGPL
 ## AUTOBUILDREQ-BEGIN
@@ -83,6 +83,9 @@ This package contains static libraries and header files needed for development.
 %{_libdir}/gtkmm-%{apiver}/proc/m4/*.m4
 
 %changelog
+* Tue Jun 01 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 4.2.0-1mamba
+- update to 4.2.0
+
 * Sun Apr 18 2021 Automatic Build System <autodist@mambasoft.it> 4.0.1-1mamba
 - automatic version update by autodist