diff --git a/hplip.spec b/hplip.spec
index ee41165..bda9cca 100644
--- a/hplip.spec
+++ b/hplip.spec
@@ -2,14 +2,14 @@
 %define        lp_gid 9
 %define cups_ver %(cups-config --api-version)
 Name:          hplip
-Version:       3.21.4
-Release:       2mamba
+Version:       3.21.6
+Release:       1mamba
 Summary:       A printer driver for HP inkjet devices
 Group:         System/Spooling
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           https://developers.hp.com/hp-linux-imaging-and-printing/hplip-web/index.html
+URL:           https://developers.hp.com/hp-linux-imaging-and-printing
 Source:        http://downloads.sourceforge.net/sourceforge/hplip/hplip-%{version}.tar.gz
 Source1:       http://www.openprinting.org/download/printdriver/auxfiles/HP/plugins/hplip-%{version}-plugin.run
 Patch0:        %{name}-3.11.7-cups-1.5.patch
@@ -28,6 +28,7 @@ BuildRequires: libdbus-devel
 BuildRequires: libgcc
 BuildRequires: libjpeg-devel
 BuildRequires: libnetsnmp-devel
+BuildRequires: libnsl-devel
 BuildRequires: libopenssl-devel
 BuildRequires: libsane-backends-devel
 BuildRequires: libssp-devel
@@ -280,6 +281,9 @@ fi
 %{_localstatedir}/lib/hp/hplip.state
 
 %changelog
+* Sun Jul 25 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 3.21.6-1mamba
+- update to 3.21.6
+
 * Mon Jun 21 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 3.21.4-2mamba
 - readd patch to disable libImageProcessor