diff --git a/.github/workflows/ci-delta-ship.yml b/.github/workflows/ci-delta-ship.yml
index ecf8e997c5..4d33a9d873 100644
--- a/.github/workflows/ci-delta-ship.yml
+++ b/.github/workflows/ci-delta-ship.yml
@@ -46,4 +46,5 @@ jobs:
       - name: Unit tests
         run: |
           sbt -Dsbt.color=always -Dsbt.supershell=false \
+            clean \
             ship-unit-tests