diff --git a/Formula/avr-gcc@9.rb b/Formula/avr-gcc@9.rb
index 2a492d0..40949a7 100644
--- a/Formula/avr-gcc@9.rb
+++ b/Formula/avr-gcc@9.rb
@@ -7,23 +7,13 @@ class AvrGccAT9 < Formula
   sha256 "c95da32f440378d7751dd95533186f7fc05ceb4fb65eb5b85234e6299eb9838e"
 
   license "GPL-3.0-or-later" => { with: "GCC-exception-3.1" }
-  revision 1
 
   head "https://gcc.gnu.org/git/gcc.git", branch: "releases/gcc-9"
 
-  bottle do
-    root_url "https://github.com/osx-cross/homebrew-avr/releases/download/avr-gcc@9-9.4.0_1"
-    sha256 arm64_sonoma: "bd400587fee5d1f34c41de95d80a2e0bd99eb350902e1c535c1ae332a5107f00"
-    sha256 ventura:      "d057720b566d688fd97c5c2293fc07090da0e6988c677abe894e132471243589"
-    sha256 monterey:     "74ce93105e38ff9a61383348924d603f18d41cd7440822ec7337ee6aa9609f8f"
-  end
-
   # The bottles are built on systems with the CLT installed, and do not work
   # out of the box on Xcode-only systems due to an incorrect sysroot.
   pour_bottle? only_if: :clt_installed
 
-  option "with-ATMega168pbSupport", "Add ATMega168pb Support to avr-gcc"
-
   # automake & autoconf are needed to build from source
   # with the ATMega168pbSupport option.
   depends_on "autoconf" => :build
@@ -40,19 +30,9 @@ class AvrGccAT9 < Formula
   # GCC bootstraps itself, so it is OK to have an incompatible C++ stdlib
   cxxstdlib_check :skip
 
-  current_build = build
-
   resource "avr-libc" do
-    url "https://download.savannah.gnu.org/releases/avr-libc/avr-libc-2.1.0.tar.bz2"
-    mirror "https://download-mirror.savannah.gnu.org/releases/avr-libc/avr-libc-2.1.0.tar.bz2"
-    sha256 "0b84cee5c08b5d5cba67c36125e5aaa85251bc9accfba5773bfa87bc34b654e8"
-
-    if current_build.with? "ATMega168pbSupport"
-      patch do
-        url "https://raw.githubusercontent.com/osx-cross/homebrew-avr/d2e2566b06b90355952ed996707a0a1a24673cd3/Patch/avr-libc-add-mcu-atmega168pb.patch"
-        sha256 "7a2bf2e11cfd9335e8e143eecb94480b4871e8e1ac54392c2ee2d89010b43711"
-      end
-    end
+    url "https://github.com/avrdudes/avr-libc/releases/download/avr-libc-2_2_1-release/avr-libc-2.2.1.tar.bz2"
+    sha256 "006a6306cbbc938c3bdb583ac54f93fe7d7c8cf97f9cde91f91c6fb0273ab465"
   end
 
   # This patch fixes a GCC compilation error on Apple ARM systems by adding
@@ -124,8 +104,6 @@ def install
     rm_r(info)
     rm_r(man7)
 
-    current_build = build
-
     resource("avr-libc").stage do
       ENV.prepend_path "PATH", bin
 
@@ -142,7 +120,6 @@ def install
         puts "Forcing build system to aarch64-apple-darwin."
       end
 
-      system "./bootstrap" if current_build.with? "ATMega168pbSupport"
       system "./configure", "--prefix=#{prefix}", "--host=avr"
       system "make", "install"
     end