diff --git a/libX11.spec b/libX11.spec
index 6d721a6..46b8da3 100644
--- a/libX11.spec
+++ b/libX11.spec
@@ -1,5 +1,5 @@
 Name:          libX11
-Version:       1.7.2
+Version:       1.7.3.1
 Release:       1mamba
 Summary:       X.Org X11 library
 Group:         System/Libraries
@@ -7,7 +7,7 @@ Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
 URL:           https://x.org/wiki/
-Source:        ftp://ftp.x.org/pub/individual/lib/libX11-%{version}.tar.bz2
+Source:        https://ftp.x.org/archive/individual/lib/libX11-%{version}.tar.xz
 License:       MIT
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
@@ -82,6 +82,9 @@ This package contains static libraries and header files needed for development.
 %doc ChangeLog NEWS
 
 %changelog
+* Mon Dec 27 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 1.7.3.1-1mamba
+- update to 1.7.3.1
+
 * Mon Jun 07 2021 Automatic Build System <autodist@mambasoft.it> 1.7.2-1mamba
 - automatic version update by autodist