diff --git a/winbuild/README.md b/winbuild/README.md
index 21b40d4e6..2975acf28 100644
--- a/winbuild/README.md
+++ b/winbuild/README.md
@@ -18,7 +18,7 @@ The following is a simplified version of the script used on AppVeyor:
 ```
 set PYTHON=C:\Python38\bin
 cd /D C:\Pillow\winbuild
-C:\Python37\bin\python.exe build_prepare.py -v --depends=C:\pillow-depends
+C:\Python39\bin\python.exe build_prepare.py -v --depends=C:\pillow-depends
 build\build_dep_all.cmd
 build\build_pillow.cmd install
 cd ..
diff --git a/winbuild/build.rst b/winbuild/build.rst
index e83045f0c..99dfad301 100644
--- a/winbuild/build.rst
+++ b/winbuild/build.rst
@@ -112,7 +112,7 @@ The following is a simplified version of the script used on AppVeyor::
 
     set PYTHON=C:\Python38\bin
     cd /D C:\Pillow\winbuild
-    C:\Python37\bin\python.exe build_prepare.py -v --depends C:\pillow-depends
+    C:\Python39\bin\python.exe build_prepare.py -v --depends C:\pillow-depends
     build\build_dep_all.cmd
     build\build_pillow.cmd install
     cd ..