diff --git a/appveyor.yml b/appveyor.yml
index 0d61dcd36..95214ac8b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -4,7 +4,7 @@ cache:
   - '%LOCALAPPDATA%\pip\Cache'
   -  /Users/appveyor/Libraries/Caches/pip
 
-stack: python 3.9
+stack: python 3.8
 
 environment:
   matrix: