diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1bb7c9efb..fe911e34d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -169,12 +169,12 @@ jobs:
             python-version: "3.9"
             force-foolscap: false
           - os: windows-latest
-            python-version: "3.9"
+            python-version: "3.11"
             force-foolscap: false
           # 22.04 has some issue with Tor at the moment:
           # https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3943
           - os: ubuntu-20.04
-            python-version: "3.11"
+            python-version: "3.10"
             force-foolscap: false
     steps: