diff --git a/pkgs/development/compilers/gcc/11/default.nix b/pkgs/development/compilers/gcc/11/default.nix
index 3b03e185dd86..edfc5c7614a0 100644
--- a/pkgs/development/compilers/gcc/11/default.nix
+++ b/pkgs/development/compilers/gcc/11/default.nix
@@ -47,13 +47,7 @@ with lib;
 with builtins;
 
 let majorVersion = "11";
-    # The patch below for aarch64-darwin does not apply to 11.3.0 and an
-    # updated version is not available. Keep aarch64-darwin on 11.2.0 so the
-    # large body of packages which depend on gfortran are still functional
-    # until GCC 12 is the default.
-    # On x86_64-darwin, building libgcc suffers from some different issues with 11.3.0.
-    version = if stdenv.isDarwin then
-      "${majorVersion}.2.0" else "${majorVersion}.3.0";
+    version = "${majorVersion}.3.0";
 
     inherit (stdenv) buildPlatform hostPlatform targetPlatform;
 
@@ -70,10 +64,14 @@ let majorVersion = "11";
       ++ optional langFortran ../gfortran-driving.patch
       ++ optional (targetPlatform.libc == "musl" && targetPlatform.isPower) ../ppc-musl.patch
 
-      ++ optional (stdenv.isDarwin && stdenv.isAarch64) (fetchpatch {
-        url = "https://github.com/fxcoudert/gcc/compare/releases/gcc-11.2.0...gcc-11.2.0-arm-20211201.diff";
-        sha256 = "sha256-z62s/cXuH9Kgq/oD/OiiZ8LWnX1xl1D43sONnwaEW1w=";
-      })
+      ++ optionals stdenv.isDarwin [
+        (fetchpatch {
+          # There are no upstream release tags in https://github.com/iains/gcc-11-branch.
+          # 2d280e7 is the commit from https://github.com/gcc-mirror/gcc/releases/tag/releases%2Fgcc-11.3.0
+          url = "https://github.com/iains/gcc-11-branch/compare/2d280e7eafc086e9df85f50ed1a6526d6a3a204d..gcc-11.3-darwin-r2.diff";
+          sha256 = "sha256-LFAXUEoYD7YeCG8V9mWanygyQOI7U5OhCRIKOVCCDAg=";
+        })
+      ]
 
       # Obtain latest patch with ../update-mcfgthread-patches.sh
       ++ optional (!crossStageStatic && targetPlatform.isMinGW) ./Added-mcf-thread-model-support-from-mcfgthread.patch;
@@ -93,9 +91,7 @@ stdenv.mkDerivation ({
 
   src = fetchurl {
     url = "mirror://gcc/releases/gcc-${version}/gcc-${version}.tar.xz";
-    sha256 = if stdenv.isDarwin
-      then "sha256-0I7cU2tUw3KhAQ/2YZ3SdMDxYDqkkhK6IPeqLNo2+os="
-      else "sha256-tHzygYaR9bHiHfK7OMeV+sLPvWQO3i0KXhyJ4zijrDk=";
+    sha256 = "sha256-tHzygYaR9bHiHfK7OMeV+sLPvWQO3i0KXhyJ4zijrDk=";
   };
 
   inherit patches;