--- a/python/mozboot/mozboot/windows.py
+++ b/python/mozboot/mozboot/windows.py
@@ -8,17 +8,16 @@ import subprocess
 
 from mozboot.base import BaseBootstrapper
 
 class WindowsBootstrapper(BaseBootstrapper):
     '''Bootstrapper for msys2 based environments for building in Windows.'''
 
     SYSTEM_PACKAGES = [
         'mingw-w64-x86_64-make',
-        'mingw-w64-x86_64-python2',
         'mingw-w64-x86_64-python2-pip',
         'mingw-w64-x86_64-perl',
         'patch',
         'patchutils',
         'diffutils',
         'autoconf2.13',
         'tar',
         'zip',
@@ -51,16 +50,19 @@ class WindowsBootstrapper(BaseBootstrapp
         return BaseBootstrapper.which(self, name + '.exe')
 
     def install_system_packages(self):
         self.pacman_install(*self.SYSTEM_PACKAGES)
 
     def upgrade_mercurial(self, current):
         self.pip_install('mercurial')
 
+    def upgrade_python(self, current):
+        self.pacman_install('mingw-w64-x86_64-python2')
+
     def install_browser_packages(self):
         self.pacman_install(*self.BROWSER_PACKAGES)
 
     def install_mobile_android_packages(self):
         raise NotImplementedError('We do not support building Android on Windows. Sorry!')
 
     def install_mobile_android_artifact_mode_packages(self):
         raise NotImplementedError('We do not support building Android on Windows. Sorry!')