diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 104b4bc..e2e483c 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -35,7 +35,9 @@ jobs:
     - name: Download SFD maps
       run: bash get_sfd_maps.sh
     - name: Build package
-      run: python -m build
+      run: |
+        python -m pip install numpy
+        python -m build
     - name: Publish package
       uses: pypa/gh-action-pypi-publish@release/v1