WIP

Author: jonashaag

ci/azure/windows.yml

@@ -26,7 +26,7 @@ jobs:
         Write-Host "##vso[task.prependpath]$env:CONDA\Scripts"
         Write-Host "##vso[task.prependpath]$HOME/miniconda3/bin"
       displayName: 'Add conda to PATH'
-    - bash: conda install -yv -c conda-forge -n base mamba
+    - bash: conda install -yv -c conda-forge -n base 'mamba<0.21'
       displayName: 'Install mamba'
 
     # See https://github.com/mamba-org/mamba/issues/633