diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 055cddd6..edfcd602 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -233,7 +233,7 @@ jobs:
       fail-fast: false
       matrix:
         platform:
-          - os: ubicloud-standard-4
+          - os: ubicloud-standard-2
             flags: ''
           - os: macos-13
             flags: ''