diff --git a/.github/workflows/linux-test.yml b/.github/workflows/linux-test.yml
index 2c2da557..e4b27836 100644
--- a/.github/workflows/linux-test.yml
+++ b/.github/workflows/linux-test.yml
@@ -29,8 +29,8 @@ jobs:
       uses: conda-incubator/setup-miniconda@v2
       with:
         python-version: ${{ matrix.python-version }}
-        mamba-version: "*"
-        channels: conda-forge,defaults
+        miniforge-variant: Mambaforge
+        channels: conda-forge
         channel-priority: true
         activate-environment: geofabrics
         environment-file: environment_linux.yml