diff --git a/mac_osx_app/__boot__.py b/mac_osx_app/__boot__.py
index e398a24b..5e8e9f00 100644
--- a/mac_osx_app/__boot__.py
+++ b/mac_osx_app/__boot__.py
@@ -4,7 +4,7 @@
 import re
 os.environ["ARGVZERO"] = sys.argv[0]
 os.environ["RESOURCEPATH"] = os.path.split(__file__)[0]
-PYTHON = 'python3.11'
+PYTHON = 'python3.13'
 
 def _reset_sys_path():
     # Clear generic sys.path[0]
@@ -96,12 +96,12 @@ def _setup_ctypes():
 _setup_ctypes()
 
 
-def _boot_tkinter():
-    import os
-
-    resourcepath = os.environ["RESOURCEPATH"]
-    os.putenv("TCL_LIBRARY", os.path.join(resourcepath, "lib/tcl8"))
-    os.putenv("TK_LIBRARY", os.path.join(resourcepath, "lib/tk8.6"))
+#def _boot_tkinter():
+#    import os
+#
+#    resourcepath = os.environ["RESOURCEPATH"]
+#    os.putenv("TCL_LIBRARY", os.path.join(resourcepath, "lib/tcl8"))
+#    os.putenv("TK_LIBRARY", os.path.join(resourcepath, "lib/tk8.6"))
 #_boot_tkinter()
 
 
diff --git a/mac_osx_app/release.py b/mac_osx_app/release.py
index 01cfaf10..672fbb36 100755
--- a/mac_osx_app/release.py
+++ b/mac_osx_app/release.py
@@ -9,15 +9,14 @@
 from subprocess import check_call, call, Popen, PIPE
 from math import ceil
 from check_target import TkChecker
-APP_PYTHON = 'python3.11'
-PYTHON_ZIP = 'python311.zip'
+APP_PYTHON = 'python3.13'
+PYTHON_ZIP = 'python313.zip'
 
 # Make sure that we have our frameworks.
 if not os.path.exists('Frameworks.tgz'):
     print("Please build the frameworks for SnapPy.app first.")
     sys.exit(1)
 
-# Disable M1 builds until we can test.
 os.environ['_PYTHON_HOST_PLATFORM'] = 'macosx-10.9-universal2'
 os.environ['ARCHFLAGS'] = '-arch arm64 -arch x86_64'
 
@@ -170,7 +169,7 @@ def do_release(python, dmg_name, freshen=True):
         nmd_python_dir = os.environ['HOME'] + '/pkgs/pythons'
         if os.path.exists(nmd_python_dir):
             print('Using virtualenv Pythons')
-            python3 = nmd_python_dir + '/py311/bin/python'
+            python3 = nmd_python_dir + '/py313/bin/python'
         else:
             python3 = APP_PYTHON
         freshen = '--no-freshen' not in sys.argv
diff --git a/mac_osx_app/setup.py b/mac_osx_app/setup.py
index 20c8d5ce..4987cc5f 100644
--- a/mac_osx_app/setup.py
+++ b/mac_osx_app/setup.py
@@ -1,47 +1,17 @@
-"""
-This is a setup.py script generated by py2applet
-
-Usage:
-    python setup.py py2app
-
-Building everything from scratch:
-
-Download and install Python 2.6.2 binary installer : http://www.python.org/download/releases/2.6.2/
-Download and install Tcl/Tk 8.5 binaries : http://www.activestate.com/activetcl/
-Download Python 2.6.2 source : http://www.python.org/download/releases/2.6.2/
-
-
-tar xjf Python-2.6.2.tar.bz2
-cd Python-2.6.2
-./configure --enable-framework --enable-universalsdk 
-make
-cp build/lib.macosx-10.3-fat-2.6/_tkinter.so /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/lib-dynload/
-
-
-python ~/work/bin/ez_setup.py
-cd ~/work/plink; python setup.py install
-
-python -m easy_install ipython
-python -m easy_install py2app
-sudo touch /Library/Frameworks/Python.framework/Versions/2.6/Resources/version.plist
-python -m easy_install mercurial
-python -m easy_install sphinx
-python -m easy_install pyx==0.12.1
-....
-
-
-Note for 8.4.19 one needs to rebuild libToGL.
-For 8.5.7....
-"""
-
 from setuptools import setup, Command
 import os, sys, glob, plistlib
 from py2app import __version__ as py2app_version
+import py2app.util
+
+def codesign_adhoc(bundle):
+  print('Monkey patching py2app to prevent codesigning, since we do this ourselves at the end')
+py2app.util.codesign_adhoc = codesign_adhoc
+  
 from snappy.version import version as SnapPy_version
 try:
   import pyx
 except ImportError:
-  raise ValueError('Please install PyX. (For python 2.7 use version 0.12.1.)')
+  raise ValueError('Please install PyX.')
 
 class clean(Command):
     user_options = []