diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index dca62a0..45f89da 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -18,6 +18,7 @@ jobs:
     - uses: actions/checkout@v2
     - uses: conda-incubator/setup-miniconda@v3
       with:
+        mamba-version: "*"
         activate-environment: rdf
         environment-file: environment.yml
         python-version: ${{ matrix.python-version }}