@@ -119,23 +119,21 @@ jobs:
           fetch-depth: 0
           submodules: 'recursive'
       - name: Setup Conda
-        uses: conda-incubator/setup-miniconda@v3
+        uses: conda-incubator/setup-miniconda@v4
         with:
-          python-version: ${{ matrix.python }}
+          auto-update-conda: true
           activate-environment: build-env
-          environment-file: .github/conda-env/build-env.yml
           miniforge-version: latest
-          channels: conda-forge,defaults
+          conda-build-version: 26.3.0
           channel-priority: strict
-          auto-update-conda: false
-          auto-activate-base: false
       - name: Conda build
         shell: bash -el {0}
         run: |
           set -e
-          conda mambabuild conda-recipe
+          conda install conda-index
+          conda build conda-recipe --python ${{ matrix.python }}
           # preserve directory structure for custom conda channel
-          find "${CONDA_PREFIX}/conda-bld" -maxdepth 2 -name 'slycot*.tar.bz2' | while read -r conda_pkg; do
+          find "${CONDA_PREFIX}" -maxdepth 2 -name 'slycot*.tar.bz2' | while read -r conda_pkg; do
             conda_platform=$(basename $(dirname "${conda_pkg}"))
             mkdir -p "slycot-conda-pkgs/${conda_platform}"
             cp "${conda_pkg}" "slycot-conda-pkgs/${conda_platform}/"