diff --git a/.appveyor.yml b/.appveyor.yml
index 0106e048..e1db6185 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -13,6 +13,8 @@ environment:
         # https://www.appveyor.com/docs/windows-images-software/#python
       - {PY_VER: "27", PY_ARCH: "32"}
       - {PY_VER: "27", PY_ARCH: "64"}
+      - {PY_VER: "39", PY_ARCH: "32"}
+      - {PY_VER: "39", PY_ARCH: "64"}
       - {PY_VER: "38", PY_ARCH: "32"}
       - {PY_VER: "38", PY_ARCH: "64"}
       - {PY_VER: "37", PY_ARCH: "32"}
diff --git a/scripts/appveyor.py b/scripts/appveyor.py
index dfb42d78..824ba6b3 100755
--- a/scripts/appveyor.py
+++ b/scripts/appveyor.py
@@ -694,7 +694,7 @@ class Options:
     def py_ver(self):
         """The Python version to build as 2 digits string."""
         rv = os.environ['PY_VER']
-        assert rv in ('27', '34', '35', '36', '37', '38'), rv
+        assert rv in ('27', '34', '35', '36', '37', '38', '39'), rv
         return rv
 
     @property