diff -r 8ec4e8d7bbe6 -r fc1ba19ec4a0 contrib/automation/hgautomation/cli.py
--- a/contrib/automation/hgautomation/cli.py	Mon Nov 15 20:10:50 2021 -0800
+++ b/contrib/automation/hgautomation/cli.py	Tue Nov 23 17:52:38 2021 -0800
@@ -158,7 +158,7 @@
 
         windows.synchronize_hg(SOURCE_ROOT, revision, instance)
 
-        for py_version in ("2.7", "3.7", "3.8", "3.9"):
+        for py_version in ("2.7", "3.7", "3.8", "3.9", "3.10"):
             for arch in ("x86", "x64"):
                 windows.purge_hg(winrm_client)
                 windows.build_wheel(
@@ -377,7 +377,7 @@
     sp.add_argument(
         '--python-version',
         help='Python version to build for',
-        choices={'2.7', '3.7', '3.8', '3.9'},
+        choices={'2.7', '3.7', '3.8', '3.9', '3.10'},
         nargs='*',
         default=['3.8'],
     )
@@ -501,7 +501,7 @@
     sp.add_argument(
         '--python-version',
         help='Python version to use',
-        choices={'2.7', '3.5', '3.6', '3.7', '3.8', '3.9'},
+        choices={'2.7', '3.5', '3.6', '3.7', '3.8', '3.9', '3.10'},
         default='2.7',
     )
     sp.add_argument(