diff --git a/avrdude.spec b/avrdude.spec
index 83ce750..5e3d54a 100644
--- a/avrdude.spec
+++ b/avrdude.spec
@@ -1,28 +1,29 @@
 Name:          avrdude
-Version:       6.3
+Version:       6.4
 Release:       1mamba
 Summary:       AVR Downloader/UploaDEr
 Group:         System/Tools
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Stefano Cotta Ramusino <stefano.cotta@openmamba.org>
-URL:           http://www.nongnu.org/avrdude
+URL:           http://www.nongnu.org/avrdude/
 Source:        http://download.savannah.gnu.org/releases/avrdude/avrdude-%{version}.tar.gz
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
 BuildRequires: libelf-devel
 BuildRequires: libftdi1-devel
+BuildRequires: libhidapi-devel
 BuildRequires: libncurses-devel
 BuildRequires: libreadline-devel
 BuildRequires: libtermcap-devel
+BuildRequires: libudev-devel
 BuildRequires: libusb-compat-devel
-BuildRequires: libusbx-devel
+BuildRequires: libusb-devel
 ## AUTOBUILDREQ-END
 BuildRequires: libftdi1-devel >= 1.1
 Requires:      lib%{name} = %{?epoch:%epoch:}%{version}-%{release}
 Requires(post): %{__install_info}
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
 AVRDUDE is an utility to download/upload/manipulate the ROM and EEPROM contents of AVR microcontrollers using the in-system programming technique (ISP).
@@ -92,6 +93,9 @@ exit 0
 %{_libdir}/libavrdude.so
 
 %changelog
+* Fri Dec 17 2021 Automatic Build System <autodist@mambasoft.it> 6.4-1mamba
+- automatic version update by autodist
+
 * Sun Feb 28 2016 Automatic Build System <autodist@mambasoft.it> 6.3-1mamba
 - automatic version update by autodist