diff --git a/.github/workflows/test_notebooks.yml b/.github/workflows/test_notebooks.yml
index 5b751df..c1f99ef 100644
--- a/.github/workflows/test_notebooks.yml
+++ b/.github/workflows/test_notebooks.yml
@@ -18,11 +18,12 @@ jobs:
       - name: Install miniconda
         uses: conda-incubator/setup-miniconda@v2
         with:
-          mamba-version: "*"
-          channels: conda-forge,defaults
+          channels: conda-forge
           channel-priority: true
           activate-environment: workshop-itn-potsdam-2023-01
           environment-file: environment.yml
+          miniforge-version: latest
+          miniforge-variant: Mambaforge
       - name: Conda info
         shell: bash -l {0}
         run: conda info