diff --git a/python-attrs.spec b/python-attrs.spec
index b6d41af..3654556 100644
--- a/python-attrs.spec
+++ b/python-attrs.spec
@@ -1,13 +1,13 @@
 Name:          python-attrs
-Version:       21.2.0
+Version:       21.4.0
 Release:       1mamba
 Summary:       Classes Without Boilerplate
 Group:         System/Libraries
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           https://www.attrs.or
-Source:        http://pypi.debian.net/attrs/attrs-%{version}.tar.gz
+URL:           https://www.attrs.org/en/stable/
+Source:        https://pypi.debian.net/attrs/attrs-%{version}.tar.gz
 License:       BSD
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: libpython3-devel
@@ -46,6 +46,9 @@ sed -i "\,\.egg-info/,d;s,.*/man/.*,&.gz," %{name}.filelist
 %doc LICENSE
 
 %changelog
+* Tue Jan 11 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 21.4.0-1mamba
+- update to 21.4.0
+
 * Fri May 07 2021 Automatic Build System <autodist@mambasoft.it> 21.2.0-1mamba
 - automatic version update by autodist