diff --git a/.github/workflows/example-6.yml b/.github/workflows/example-6.yml
index 941029b8..6c20d476 100644
--- a/.github/workflows/example-6.yml
+++ b/.github/workflows/example-6.yml
@@ -49,8 +49,11 @@ jobs:
       - uses: ./
         with:
           miniforge-variant: Miniforge3
-          # Use an old Miniforge (without conda-libmamba-solver) to allow updates to mamba v2
+          # Use an old Miniforge (without conda-libmamba-solver) to allow updates to mamba v2.
+          # Set the solver to classic for those too. This can be removed when 
+          # conda-libmamba-solver is released with libmamba v2 compatibility.
           miniforge-version: ${{ matrix.mamba-version == '2' && '23.1.0-0' || 'latest' }}
+          solver: ${{ matrix.mamba-version == '2' && 'classic' || 'libmamba' }}
           python-version: "3.11"
           mamba-version: ${{ matrix.mamba-version }}
           channels: conda-forge,nodefaults