diff --git a/.github/workflows/emacs.yml b/.github/workflows/emacs.yml
index 1c2a6bb..7883452 100644
--- a/.github/workflows/emacs.yml
+++ b/.github/workflows/emacs.yml
@@ -21,10 +21,10 @@ jobs:
       - name: build and pack
         run: |
           pushd build-scripts
-          ./fetch-emacs-mac-port.sh "27.2-mac-8.3"
-          ./build-emacs.sh emacs-source "27.2"
+          ./fetch-emacs-mac-port.sh "28.1-mac-9.0"
+          ./build-emacs.sh emacs-source "28.1"
           pushd emacs-source; ../copylib.rb $(brew --prefix); popd
-          ./make-zipball.sh emacs-source/tmproot "27.2-mac-8.3"
+          ./make-zipball.sh emacs-source/tmproot "28.1-mac-9.0"
           ls -d $PWD/emacs-source/tmproot/*.zip
           popd
 
@@ -34,7 +34,7 @@ jobs:
           name: ${{ matrix.os }}-${{ env.REL_DATE }}
           draft: true
           files: |
-            build-scripts/emacs-source/tmproot/emacs-27.2-mac-8.3-${{ env.OS_VER }}.zip
-            build-scripts/emacs-source/tmproot/emacs-27.2-mac-8.3-${{ env.OS_VER }}-spacemacs-icon.zip
+            build-scripts/emacs-source/tmproot/emacs-28.1-mac-9.0-${{ env.OS_VER }}.zip
+            build-scripts/emacs-source/tmproot/emacs-28.1-mac-9.0-${{ env.OS_VER }}-spacemacs-icon.zip
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
\ No newline at end of file
diff --git a/Casks/emacs-mac-spacemacs-icon.rb b/Casks/emacs-mac-spacemacs-icon.rb
index 22ca917..d0f2334 100644
--- a/Casks/emacs-mac-spacemacs-icon.rb
+++ b/Casks/emacs-mac-spacemacs-icon.rb
@@ -1,25 +1,27 @@
 cask 'emacs-mac-spacemacs-icon' do
-  version 'emacs-27.2-mac-8.3.1'
+  version 'emacs-28.1-mac-9.0'
 
   if Hardware::CPU.intel?
-    if MacOS.version <= :high_sierra
-      odie "Because of the limitation of build system, there is no cask support for High Sierra(10.13) and earlier, please build from Homebrew formula."
-    elsif MacOS.version <= :mojave
-      sha256 '30fb8ad8114fc61942ea7c1222029c9a81484ca8e9d134ea8623e772e03ed350'
-      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-27.2-mac-8.3/emacs-27.2-mac-8.3-10.14.6-spacemacs-icon.zip'
+    if MacOS.version <= :mojave
+      odie "Because of the limitation of build system, there is no cask support for mojave(10.14) and earlier, please build from Homebrew formula."
     elsif MacOS.version <= :catalina
-      sha256 '8eb1c1eb7a740322edacd4197ed1cff9264c1527a09ea30250409128d32a33e2'
-      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-27.2-mac-8.3/emacs-27.2-mac-8.3-10.15.7-spacemacs-icon.zip'
+      sha256 '832e1b9384730cc5ff2ce018a979aec82699a7a13c9bd18f84649a39644d50ac'
+      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-28.1-mac-9.0/emacs-28.1-mac-9.0-10.15.7-spacemacs-icon.zip'
     else
       # for macOS version is or newer than Big Sur
       # elsif MacOS.version <= :big_sur # reserved for later
-      sha256 '5ba1e2e8c230f1d98c9f855bc055593b62d54f4b84d49814f313ce28fddfe08d'
-      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-27.2-mac-8.3/emacs-27.2-mac-8.3-11.6.1-spacemacs-icon.zip'
+      sha256 '2f412038d391ed663d3731c792ca586ae439d3442ed71f5a2719c3d635c1cbc2'
+      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-28.1-mac-9.0/emacs-28.1-mac-9.0-11.6.5-spacemacs-icon.zip'
     end
   else
-    # Arm Macs should be running macOS >= Big Sur(11), let's add the version check in the future when necessary.
-    sha256 'bcacdeb6abdba2789f2b3d921185578b56203e95619cbb4b1a396c0ccadcd727'
-    url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-27.2-mac-8.3.1/emacs-27.2-mac-8.3.1-arm64-11.6.1-spacemacs-icon.zip'
+    if MacOS.version <= :big_sur
+      sha256 '00811da1b69f7edef017c3c28db8decf3e19ed4039829aa6239aeaefbb0ee106'
+      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-28.1-mac-9.0/emacs-28.1-mac-9.0-arm64-11.6.5-spacemacs-icon.zip'
+    else
+      # for macOS version is or newer than Big Sur
+      # elsif MacOS.version <= :monterey # reserved for later
+      sha256 '89e28630ceb651824cb4df5a661e1c015fe511a0569ba1006f8af5868c9577a6'
+      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-28.1-mac-9.0/emacs-28.1-mac-9.0-arm64-12.3.1-spacemacs-icon.zip'
   end
 
   appcast 'https://github.com/railwaycat/homebrew-emacsmacport/releases.atom'
diff --git a/Casks/emacs-mac.rb b/Casks/emacs-mac.rb
index 006fbab..d1363b3 100644
--- a/Casks/emacs-mac.rb
+++ b/Casks/emacs-mac.rb
@@ -1,25 +1,27 @@
 cask 'emacs-mac' do
-  version 'emacs-27.2-mac-8.3.1'
+  version 'emacs-28.1-mac-9.0'
 
   if Hardware::CPU.intel?
-    if MacOS.version <= :high_sierra
-      odie "Because of the limitation of build system, there is no cask support for High Sierra(10.13) and earlier, please build from Homebrew formula."
-    elsif MacOS.version <= :mojave
-      sha256 '6cca77eab9d1f2e2533eda8ba139e3581dca3af6c24c906912c8f8aefb939d87'
-      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-27.2-mac-8.3/emacs-27.2-mac-8.3-10.14.6.zip'
+    if MacOS.version <= :mojave
+      odie "Because of the limitation of build system, there is no cask support for Mojave(10.14) and earlier, please build from Homebrew formula."
     elsif MacOS.version <= :catalina
-      sha256 'ec393d8d69ae80dec8500312c0eb5dccfe6c0b1e08d4dc4b0094b98b2568b275'
-      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-27.2-mac-8.3/emacs-27.2-mac-8.3-10.15.7.zip'
+      sha256 'ae8cc8649d038c6ce8d27e92631a19c8f168c1b6d78c15837577468a7681395a'
+      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-28.1-mac-9.0/emacs-28.1-mac-9.0-10.15.7.zip'
     else
       # for macOS version is or newer than Big Sur
       # elsif MacOS.version <= :big_sur # reserved for later
-      sha256 'be3d78cfb715ee8ca811374cf65838e0e59d0840477d2d304889dabb7206cbd0'
-      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-27.2-mac-8.3/emacs-27.2-mac-8.3-11.6.1.zip'
+      sha256 'a3763e2b039fb8535e02a73a56a197ff5993c16fab8c75e3ff41ebea23e41073'
+      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-28.1-mac-9.0/emacs-28.1-mac-9.0-11.6.5.zip'
     end
   else
-    # Arm Macs should be running macOS >= Big Sur(11), let's add the version check in the future when necessary.
-    sha256 'bf8f32cfb0bdd5e6ef9c5816fd123f151631f916c9c4a1025f8af7569bc70147'
-    url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-27.2-mac-8.3.1/emacs-27.2-mac-8.3.1-arm64-11.6.1.zip'
+    if MacOS.version <= :big_sur
+      sha256 '7250d73194b82ea185041913b999304980c39218d14f4f98b056beed9ef4fdcf'
+      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-28.1-mac-9.0/emacs-28.1-mac-9.0-arm64-11.6.5.zip'
+    else
+      # for macOS version is or newer than Big Sur
+      # elsif MacOS.version <= :monterey # reserved for later
+      sha256 'c6fb1575bd27adabbf85234bc223ff98300391ea23dab73da4a240947416d72b'
+      url 'https://github.com/railwaycat/homebrew-emacsmacport/releases/download/emacs-28.1-mac-9.0/emacs-28.1-mac-9.0-arm64-12.3.1.zip'
   end
 
   appcast 'https://github.com/railwaycat/homebrew-emacsmacport/releases.atom'
diff --git a/build-scripts/fetch-emacs-mac-port.sh b/build-scripts/fetch-emacs-mac-port.sh
index 26b5b29..e4a57f0 100755
--- a/build-scripts/fetch-emacs-mac-port.sh
+++ b/build-scripts/fetch-emacs-mac-port.sh
@@ -2,6 +2,7 @@
 
 set -e
 
+echo "fetch tarball"
 if [ "$1" = "head" ]; then
   git clone --depth=1 --branch=work https://bitbucket.org/mituharu/emacs-mac.git emacs-source
 else
@@ -10,13 +11,14 @@ else
   tar xf emacs-$1.tar.gz -C ./emacs-source --strip-components=1
 fi
 
-# apply patch: emacs-mac-title-bar-7.4.patch
-patch -d emacs-source -p1 < ../patches/emacs-mac-title-bar-7.4.patch
+echo "apply patch: --with-natural-title-bar"
+patch -d emacs-source -p1 < ../patches/emacs-mac-title-bar-9.0.patch
 
-# apply patch: multi-tty-27.diff
+echo "apply patch: multi-tty-27"
 patch -d emacs-source -p1 < ../patches/multi-tty-27.diff
 
-# Emacs 27 will need this patch for mac builds, later version should be fixed
-if [ "$(uname -p)" = "arm" ]; then
-  patch -d emacs-source -p1 < ../patches/mac-arm-fix.diff
-fi
+echo "apply patch: bundle structure signature hack"
+# this is a hack to let pdump be installed under Contents/MacOS and libexec
+# under Contents/MacOS/libexec. To avoid an error on bundle structure when
+# signing.
+patch -d emacs-source -p1 < ../patches/bundle-signature-hack-9.0.diff
diff --git a/build-scripts/prepare_homebrew.sh b/build-scripts/prepare_homebrew.sh
index c8daf44..d83d03a 100755
--- a/build-scripts/prepare_homebrew.sh
+++ b/build-scripts/prepare_homebrew.sh
@@ -6,22 +6,11 @@ export HOMEBREW_NO_AUTO_UPDATE=1
 
 OS_VER=$(sw_vers -productVersion)
 
-if [ $OS_VER != "10.13.6" ]; then
-  # for version newer than 10.13, we can afford the upgrade time for homebrew
-  # packages. Build with the latest version/.
-  brew update
-  # remove all installed formula and reinstall from Brewfile, prevent waste time
-  # on upgrade all
-  # brew remove --force $(brew list --formula)
-  brew bundle --file $(pwd)/build-scripts/Brewfile
-else
-  # for 10.13, homebrew upgrade package takes a ridiculous time way more than
-  # the time limitation of CI, we have to skip it and use the shipping version
-  # of CI VM.
-  # brew bundle will fail on 10.13
-  brew install texinfo
-  brew install jansson
-fi
+brew update
+# remove all installed formula and reinstall from Brewfile, prevent waste time
+# on upgrade all
+# brew remove --force $(brew list --formula)
+brew bundle --file $(pwd)/build-scripts/Brewfile
 
 # output the version of gnutls
 brew info gnutls
diff --git a/patches/bundle-signature-hack-9.0.diff b/patches/bundle-signature-hack-9.0.diff
new file mode 100644
index 0000000..77588c8
--- /dev/null
+++ b/patches/bundle-signature-hack-9.0.diff
@@ -0,0 +1,33 @@
+diff --git a/configure.ac b/configure.ac
+index efb0bee993..93634efbe7 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -1911,7 +1911,7 @@ if test "${with_mac}" != no; then
+   fi
+ 
+   mac_appbindir=${mac_appdir}/Emacs.app/Contents/MacOS
+-  mac_applibexecdir=${mac_appdir}/Emacs.app/Contents/MacOS/libexec/${configuration}
++  mac_applibexecdir=${mac_appdir}/Emacs.app/Contents/MacOS/libexec
+   mac_applibdir=${mac_appdir}/Emacs.app/Contents/Frameworks
+   mac_appresdir=${mac_appdir}/Emacs.app/Contents/Resources
+ 
+diff --git a/mac/Makefile.in b/mac/Makefile.in
+index e1663c1a8f..b4dd9c5090 100644
+--- a/mac/Makefile.in
++++ b/mac/Makefile.in
+@@ -32,11 +32,11 @@ configuration=@configuration@
+ mac_self_contained=@mac_self_contained@
+ 
+ ifeq ($(DUMPING),pdumper)
+-ifeq (${mac_self_contained},no)
++# ifeq (${mac_self_contained},no)
+ bundle_pdmp := Emacs.app/Contents/MacOS/Emacs.pdmp
+-else
+-bundle_pdmp := Emacs.app/Contents/MacOS/libexec/${configuration}/Emacs.pdmp
+-endif
++# else
++# bundle_pdmp := Emacs.app/Contents/MacOS/libexec/${configuration}/Emacs.pdmp
++# endif
+ else
+ bundle_pdmp :=
+ endif