diff --git a/.github/workflows/test_simpleaf.yml b/.github/workflows/test_simpleaf.yml
index 0d170dd..8324c29 100644
--- a/.github/workflows/test_simpleaf.yml
+++ b/.github/workflows/test_simpleaf.yml
@@ -36,7 +36,6 @@ jobs:
       - name: Install conda env
         uses: conda-incubator/setup-miniconda@v3
         with:
-          mamba-version: "*"
           channels: conda-forge,default,bioconda
           channel-priority: true
           activate-environment: anaconda-client-env