diff --git a/.github/workflows/pythonapp.yml b/.github/workflows/pythonapp.yml
index c5797d0a5..ffbf102d4 100644
--- a/.github/workflows/pythonapp.yml
+++ b/.github/workflows/pythonapp.yml
@@ -16,6 +16,10 @@ jobs:
         channels: conda-forge,defaults
         channel-priority: true
         activate-environment: anaconda-client-env
+    - shell: bash -el {0}
+      name: Install mamba
+      run: |
+        conda install -n base -c conda-forge mamba
     - shell: bash -el {0}
       name: Install dependencies
       run: |