diff --git a/.github/workflows/test-snake.yml b/.github/workflows/test-snake.yml
index a89b972..f93772f 100644
--- a/.github/workflows/test-snake.yml
+++ b/.github/workflows/test-snake.yml
@@ -41,7 +41,8 @@ jobs:
           poetry install --no-interaction --no-root
           pip install -e .
           pip install snakemake
-          pip install mamba
+          conda install -c conda-forge mamba
+          mamba install -c conda-forge -c bioconda snakemake
 
       - name: Debug Python environment
         run: |