diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 497d378..228db8c 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -22,7 +22,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Install package
-        run: pip install ".[all]"
+        run: pip install -r requirements.txt
 
       - name: Test with pytest
         run: python -m pytest tests --doctest-modules --cov=multidim --cov-report=xml