@@ -123,7 +123,6 @@ jobs:
         with:
           python-version: ${{ matrix.python }}
           activate-environment: build-env
-          environment-file: .github/conda-env/build-env.yml
           miniforge-version: latest
           channels: conda-forge,defaults
           channel-priority: strict
@@ -133,6 +132,7 @@ jobs:
         shell: bash -el {0}
         run: |
           set -e
+          conda install boa numpy
           conda mambabuild conda-recipe
           # preserve directory structure for custom conda channel
           find "${CONDA_PREFIX}/conda-bld" -maxdepth 2 -name 'slycot*.tar.bz2' | while read -r conda_pkg; do