diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 9ddcb1958..7b20a8766 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -74,7 +74,7 @@ jobs:
     #  install root project
     #------------------------
     - name: Install library
-      run: poetry install --no-interaction --with dev,optional_io_formats,optional_plotting,tutorials,wbdata --only-root
+      run: poetry install --no-interaction --with dev,optional_io_formats,optional_plotting,tutorials,wbdata
 
     - name: Test with pytest (including Matplotlib)
       run: poetry run pytest tests --mpl
diff --git a/.github/workflows/pytest-legacy.yml b/.github/workflows/pytest-legacy.yml
index 5ea20f093..a978081ce 100644
--- a/.github/workflows/pytest-legacy.yml
+++ b/.github/workflows/pytest-legacy.yml
@@ -66,7 +66,7 @@ jobs:
     #  install root project
     #------------------------
     - name: Install library
-      run: poetry install --no-interaction --with dev,optional_io_formats,optional_plotting,tutorials --only-root
+      run: poetry install --no-interaction --with dev,optional_io_formats,optional_plotting,tutorials
 
     - name: Test with pytest
       run: poetry run pytest tests