diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index dff7f18..b44d097 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -57,5 +57,5 @@ jobs:
         run: |
           python -m venv venv
           venv\Scripts\Activate.ps1
-          pip install dist/*.whl
+          pip install iscc-core --no-index -f dist
           python -c "import iscc_core; iscc_core.conformance_selftest()"