diff --git a/.gitignore b/.gitignore
index 1a8a648..ffe09fa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 binutils-2.20.tar.bz2
 /binutils-2.21.tar.bz2
+/binutils-2.23.1.tar.bz2
diff --git a/avr-binutils.spec b/avr-binutils.spec
index 292b384..6674764 100644
--- a/avr-binutils.spec
+++ b/avr-binutils.spec
@@ -1,8 +1,8 @@
 %define target avr
 
 Name:           %{target}-binutils
-Version:        2.20
-Release:        5%{?dist}
+Version:        2.23.1
+Release:        1%{?dist}
 Epoch:		1
 Summary:        Cross Compiling GNU binutils targeted at %{target}
 Group:          Development/Tools
@@ -10,6 +10,8 @@ License:        GPLv2+
 URL:            http://www.gnu.org/software/binutils/
 Source0:        ftp://ftp.gnu.org/pub/gnu/binutils/binutils-%{version}.tar.bz2
 Source1:        README.fedora
+#add widespread options to avr-size: --format=avr -mcu=XX
+Patch1: http://distribute.atmel.no/tools/opensource/avr-gcc/binutils-2.20.1/30-binutils-2.20.1-avr-size.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-%(%{__id_u} -n)
 BuildRequires:  gawk texinfo
 Provides: bundled(libiberty)
@@ -22,7 +24,9 @@ native %{_arch} platform.
 
 %prep
 %setup -q -c
-
+pushd binutils-%{version}
+%patch1 -p0 -b .avr-size
+popd 
 cp %{SOURCE1} .
 
 
@@ -62,6 +66,11 @@ rm -rf $RPM_BUILD_ROOT
 
 
 %changelog
+* Thu Nov 15 2012 Michal Hlavinka <mhlavink@redhat.com> - 1:2.23.1-1
+- updated to 2.23.1
+- added new option --format=avr to avr-size for compatibility reasons 
+  with other avr toolchains
+
 * Mon Oct 15 2012 Jon Ciesla <limburgher@gmail.com> - 1:2.20-5
 - Provides: bundled(libiberty)
 
diff --git a/sources b/sources
index a72b2d9..97adf8b 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-ee2d3e996e9a2d669808713360fa96f8  binutils-2.20.tar.bz2
+33adb18c3048d057ac58d07a3f1adb38  binutils-2.23.1.tar.bz2