diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 29c12ba..5bb6564 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -34,7 +34,6 @@ jobs:
           environment-file: environment.yml
           python-version: ${{ matrix.python-version }}
           miniforge-version: "latest"
-          miniforge-variant: Mambaforge
           use-mamba: true
       - run: conda --version
       - run: python -V