diff --git a/.github/workflows/preview_release.yml b/.github/workflows/preview_release.yml
index 05b00f290..7268334a8 100644
--- a/.github/workflows/preview_release.yml
+++ b/.github/workflows/preview_release.yml
@@ -10,24 +10,53 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - uses: pyiron/actions/cached-miniforge@no_build_isolation
+    - name: Setup Mambaforge
+      uses: conda-incubator/setup-miniconda@v3
       with:
-        python-version: '3.10'
-        env-files: .ci_support/environment.yml
+        python-version: '3.12'
+        miniforge-variant: Mambaforge
+        miniforge-version: latest
+        channels: conda-forge
+        channel-priority: strict
+        activate-environment: my-env
+        use-mamba: true
+    - name: Update environment
+      shell: bash -l {0}
+      run: mamba env update -n my-env -f .ci_support/environment.yml
+    - name: Conda list
+      shell: bash -l {0}
+      run: conda list
+    - name: Peek
+      shell: bash -l {0}
+      run: |
+        which pip
+        which python
+        ls
+        cat pyproject.toml
+        cat setup.py
+    - name: Install versioneer
+      shell: bash -l {0}
+      run: |
+        pip install versioneer[toml]==0.29
+    - name: Install local code without build isolation
+      shell: bash -l {0}
+      run: |
+        pip install --no-deps . --no-build-isolation
+    - name: Install local code with build isolation
+      if: inputs.no-build-isolation != 'true'
+      shell: bash -l {0}
+      run: |
+        pip install --no-deps ${{ inputs.local-code-directory }}
     - uses: pyiron/actions/update-pyproject-dependencies@main
       with:
         lower-bound-yaml: .ci_support/lower_bound.yml
         semantic-upper-bound: minor
-        output-toml: preview.toml
         pypi-to-conda-name-map-file: .ci_support/pypi_vs_conda_names.json
     - name: Preview
       shell: bash -l {0}
       run: |
-        cat preview.toml
-        which pip
-        which python
+        cat pyproject.toml
     - name: Build
       shell: bash -l {0}
       run: |
-        pip install versioneer[toml]==0.29
         python setup.py sdist bdist_wheel
\ No newline at end of file