diff --git a/.github/workflows/rebuild-mpxv.yaml b/.github/workflows/rebuild-mpxv.yaml
index 48a5b054..e86ca02d 100644
--- a/.github/workflows/rebuild-mpxv.yaml
+++ b/.github/workflows/rebuild-mpxv.yaml
@@ -35,6 +35,7 @@ jobs:
           . \
             envdir env.d snakemake notify_on_deploy \
               --configfiles config/config_mpxv.yaml config/nextstrain_automation.yaml \
+              --cores all \
               --printshellcmds
       env:
         AWS_DEFAULT_REGION: ${{ secrets.AWS_DEFAULT_REGION }}