diff --git a/.github/workflows/python-tests.yml b/.github/workflows/python-tests.yml
index 2cb10151cc..a326c1b208 100644
--- a/.github/workflows/python-tests.yml
+++ b/.github/workflows/python-tests.yml
@@ -126,7 +126,7 @@ jobs:
       - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
       - uses: jupyterlab/maintainer-tools/.github/actions/test-sdist@v1
         with:
-          package_spec: .
+          package_spec: -vv .
           test_command: hatch run test:test || hatch run test:test --lf
 
   check_release:
diff --git a/pyproject.toml b/pyproject.toml
index 93d2c6d2ce..d01a9f875c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -120,6 +120,7 @@ ensured-targets = [
   "jupyter_server/static/style/bootstrap.min.css",
   "jupyter_server/static/style/bootstrap-theme.min.css"
 ]
+skip-if-exists = ["jupyter_server/static/style/bootstrap.min.css"]
 install-pre-commit-hook = true
 optional-editable-build = true