diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 04dc3c94..b144c2db 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -10,7 +10,7 @@ jobs:
         python ./bin/run_tests.py
 
 - job: macos_38
-  pool: {vmImage: 'macOS-11.0'}
+  pool: {vmImage: 'macOS-10.15'}
   steps:
     - task: UsePythonVersion@0
       inputs: