diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 7af501e4d..88382ce65 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -79,6 +79,9 @@ jobs:
       - uses: actions/setup-python@v4.0.0
         with:
           python-version: ${{ matrix.python-version }}
+
+      - name: install pimms
+        run: python -m pip install .
       
       - name: Install pytest
         run: python -m pip install pytest pytest-cov