diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bc71832b79..01ff442144 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macOS-latest]
+        os: [ubuntu-latest-8cores, windows-latest-8cores, macOS-latest]
         extra_flags:
           - NOT_A_PUZZLE
           - orchard