diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2585393..f31fb2c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -28,7 +28,6 @@ jobs:
       - uses: conda-incubator/setup-miniconda@v3
         with:
           python-version: "${{ matrix.python-version }}"
-          miniforge-variant: Mambaforge
           miniforge-version: latest
 
       - name: Install nox
@@ -51,7 +50,6 @@ jobs:
       - uses: conda-incubator/setup-miniconda@v3
         with:
           python-version: "3.11"
-          miniforge-variant: Mambaforge
           miniforge-version: latest
 
       - name: Install nox
diff --git a/noxfile.py b/noxfile.py
index 7a02d9c..31bdfb0 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -30,7 +30,7 @@ def test(session: nox.Session) -> None:
     session.run("pytest", *args)
 
 
-@nox.session(name="test-notebooks", venv_backend="mamba", python="3.11")
+@nox.session(name="test-notebooks", venv_backend="conda", python="3.11")
 def test_notebooks(session: nox.Session) -> None:
     """Run the notebooks."""
     args = [