diff --git a/.github/workflows/CI_tests.yml b/.github/workflows/CI_tests.yml
index 0cb8f44..f1388de 100644
--- a/.github/workflows/CI_tests.yml
+++ b/.github/workflows/CI_tests.yml
@@ -22,6 +22,8 @@ jobs:
       - uses: actions/checkout@v2
       - uses: conda-incubator/setup-miniconda@v2
         with:
+          mamba-version: "*"
+          use-mamba: true
           environment-file: environment.yml
       - name: Python info
         run: |