diff --git a/.github/workflows/updated_tests.yml b/.github/workflows/updated_tests.yml
index 1e919b7..89d571b 100644
--- a/.github/workflows/updated_tests.yml
+++ b/.github/workflows/updated_tests.yml
@@ -41,6 +41,7 @@ jobs:
       - name: Install dependencies
         shell: bash
         run: |
+          poetry lock
           poetry install --with test --all-extras
           poetry add git+https://github.com/AstarVienna/ScopeSim_Data.git