diff --git a/.github/workflows/python-test.yml b/.github/workflows/python-test.yml
index 303f7966..76905deb 100644
--- a/.github/workflows/python-test.yml
+++ b/.github/workflows/python-test.yml
@@ -65,6 +65,8 @@ jobs:
           name: tfci-var
           path: tfci-var.jsonl.gz
           compression-level: 9
+          overwrite: true
+
       - name: Basic test, nwk
         run: |
           newick_to_taxonium --input test.nwk --output nwk.jsonl.gz