diff --git a/contrib/automation/hgautomation/windows.py b/contrib/automation/hgautomation/windows.py
--- a/contrib/automation/hgautomation/windows.py
+++ b/contrib/automation/hgautomation/windows.py
@@ -127,6 +127,8 @@ WHEEL_FILENAME_PYTHON37_X86 = 'mercurial
 WHEEL_FILENAME_PYTHON37_X64 = 'mercurial-{version}-cp37-cp37m-win_amd64.whl'
 WHEEL_FILENAME_PYTHON38_X86 = 'mercurial-{version}-cp38-cp38-win32.whl'
 WHEEL_FILENAME_PYTHON38_X64 = 'mercurial-{version}-cp38-cp38-win_amd64.whl'
+WHEEL_FILENAME_PYTHON39_X86 = 'mercurial-{version}-cp39-cp39-win32.whl'
+WHEEL_FILENAME_PYTHON39_X64 = 'mercurial-{version}-cp39-cp39-win_amd64.whl'
 
 EXE_FILENAME_PYTHON2_X86 = 'Mercurial-{version}-x86-python2.exe'
 EXE_FILENAME_PYTHON2_X64 = 'Mercurial-{version}-x64-python2.exe'
@@ -471,6 +473,8 @@ def resolve_wheel_artifacts(dist_path: p
         dist_path / WHEEL_FILENAME_PYTHON37_X64.format(version=version),
         dist_path / WHEEL_FILENAME_PYTHON38_X86.format(version=version),
         dist_path / WHEEL_FILENAME_PYTHON38_X64.format(version=version),
+        dist_path / WHEEL_FILENAME_PYTHON39_X86.format(version=version),
+        dist_path / WHEEL_FILENAME_PYTHON39_X64.format(version=version),
     )
 
 
@@ -482,6 +486,8 @@ def resolve_all_artifacts(dist_path: pat
         dist_path / WHEEL_FILENAME_PYTHON37_X64.format(version=version),
         dist_path / WHEEL_FILENAME_PYTHON38_X86.format(version=version),
         dist_path / WHEEL_FILENAME_PYTHON38_X64.format(version=version),
+        dist_path / WHEEL_FILENAME_PYTHON39_X86.format(version=version),
+        dist_path / WHEEL_FILENAME_PYTHON39_X64.format(version=version),
         dist_path / EXE_FILENAME_PYTHON2_X86.format(version=version),
         dist_path / EXE_FILENAME_PYTHON2_X64.format(version=version),
         dist_path / EXE_FILENAME_PYTHON3_X86.format(version=version),