diff --git a/docbook-dtds.spec b/docbook-dtds.spec
index a6e12b2..33d4074 100644
--- a/docbook-dtds.spec
+++ b/docbook-dtds.spec
@@ -3,14 +3,14 @@
 %{!?_pkgdocdir: %global _pkgdocdir %{_docdir}/%{name}-%{version}}
 Name:         docbook-dtds
 Epoch:        1
-Version:      1.0
-Release:      2mamba
+Version:      4.5
+Release:      1mamba
 Group:        Applications/Publishing
 Summary:      SGML and XML document type definitions for DocBook.
 License:      Distributable
 URL:          http://www.oasis-open.org/docbook/
-Distribution: openmamba
-Vendor:       openmamba
+Distribution:  openmamba
+Vendor:        openmamba
 Packager:     Silvan Calarco <silvan.calarco@mambasoft.it>
 Source0:      http://www.oasis-open.org/docbook/sgml/3.0/docbk30.zip
 Source1:      http://www.oasis-open.org/docbook/sgml/3.1/docbk31.zip
@@ -378,6 +378,9 @@ done
 %{_pkgdocdir}
 
 %changelog
+* Fri Jun 11 2021 Automatic Build System <autodist@mambasoft.it> 4.5-1mamba
+- automatic version update by autodist
+
 * Thu Jun 10 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 1.0-2mamba
 - restore compatibility symlinks in %share/xml/docbook/schema/