diff --git a/.github/workflows/azure_ci.yml b/.github/workflows/azure_ci.yml
index 61a005c4..e32bda39 100644
--- a/.github/workflows/azure_ci.yml
+++ b/.github/workflows/azure_ci.yml
@@ -24,6 +24,7 @@ jobs:
     - name: Install Conda environment from environment.yml
       uses: mamba-org/setup-micromamba@v1
       with:
+        micromamba-version: '1.4.6'
         environment-file: environment.yml
         cache-environment: true
     - name: Install and run_test.py