diff --git a/.github/workflows/_build-non-pure-package.yml b/.github/workflows/_build-non-pure-package.yml
index df5d8da..1ffca23 100644
--- a/.github/workflows/_build-non-pure-package.yml
+++ b/.github/workflows/_build-non-pure-package.yml
@@ -31,6 +31,7 @@ jobs:
 
       - name: Build sdist
         run: |
+          conda install --file requirements/conda.txt
           pip install --upgrade build
           python -m build --sdist