diff --git a/.github/workflows/test-with-warnings.yaml b/.github/workflows/test-with-warnings.yaml
index 53965b4..ca4439e 100644
--- a/.github/workflows/test-with-warnings.yaml
+++ b/.github/workflows/test-with-warnings.yaml
@@ -40,16 +40,6 @@ jobs:
         run: |
           pip install .[test]
           conda list
-      - name: Install Poetry
-        run: |
-          pipx install poetry
-          poetry --version
-      - name: Install ska-ost-array
-        run: |
-          git clone https://gitlab.com/ska-telescope/ost/ska-ost-array-config.git
-          cd ska-ost-array-config
-          poetry install
-          cd ..
 
       - name: Run Tests
         run: |
diff --git a/tests/test_observatory.py b/tests/test_observatory.py
index 4539bc7..bd0edb4 100644
--- a/tests/test_observatory.py
+++ b/tests/test_observatory.py
@@ -207,6 +207,8 @@ def test_from_yaml(bm):
 
 
 def test_from_ska():
+    pytest.importorskip("ska_ost_array_config")
+
     from ska_ost_array_config import UVW
     from ska_ost_array_config.array_config import LowSubArray
     from ska_ost_array_config.simulation_utils import simulate_observation