diff --git a/.github/workflows/CI_build.yml b/.github/workflows/CI_build.yml
index deaadb1..ded126b 100644
--- a/.github/workflows/CI_build.yml
+++ b/.github/workflows/CI_build.yml
@@ -33,14 +33,14 @@ jobs:
           poetry install --with dev
       - name: Show pip list
         run: |
-          pip list
+          poetry pip list
       - name: Test with coverage
         run: |
           poetry run pytest --cov --cov-report term --cov-report xml --junitxml=xunit-result.xml
       - name: Correct coverage paths
         run: sed -i "s+$PWD/++g" coverage.xml
       - name: Check style against standards using Ruff
-        run: ruff check .
+        run: poetry ruff check .
       - name: Check whether import statements are used consistently
         run: poetry run isort . --check-only --diff