diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a78d0e16..c43dec96 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -60,7 +60,7 @@ jobs:
       - name: Activate Conda environment
         shell: bash -el {0}
         run: |
-          mamba activate ${{ matrix.directory }}
+          conda activate ${{ matrix.directory }}
 
       - name: Install pytest
         shell: bash -el {0}