diff --git a/.github/workflows/unittests.yml b/.github/workflows/unittests.yml
index ffbd731a..1a75ade4 100644
--- a/.github/workflows/unittests.yml
+++ b/.github/workflows/unittests.yml
@@ -10,7 +10,7 @@
 
  jobs:
    unittests:
-     name: conda (${{ matrix.os }}, ${{ matrix.environment-file }})
+     name: mamba (${{ matrix.os }}, ${{ matrix.environment-file }})
      runs-on: ${{ matrix.os }}
      timeout-minutes: 30
      strategy:
@@ -36,6 +36,8 @@
        - uses: conda-incubator/setup-miniconda@v2
          with:
             miniconda-version: 'latest'
+            mamba-version: '*'
+            use-mamba: true
             channels: conda-forge
             channel-priority: strict
             auto-update-conda: false
@@ -43,10 +45,10 @@
             environment-file: ${{ matrix.environment-file }}
             activate-environment: test
             use-only-tar-bz2: true
-       - run: conda info --all
-       - run: conda list
-       - run: conda config --show-sources
-       - run: conda config --show
+       - run: mamba info --all
+       - run: mamba list
+       #- run: mamba config --show-sources
+       #- run: mamba config --show
        - run: pytest -v spaghetti --cov=spaghetti --doctest-modules --cov-config=.coveragerc --cov-report=xml
        - name: codecov (${{ matrix.os }}, ${{ matrix.environment-file }})
          uses: codecov/codecov-action@v1