diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 9d3028a..3d18bc9 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -18,6 +18,7 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
         cache: 'poetry'
+    - run: poetry lock
     - run: poetry install
     - run: poetry run pytest