diff --git a/tests/azure/azure-pipelines.yml b/tests/azure/azure-pipelines.yml
index 8c86ce14..5d6c4ae4 100644
--- a/tests/azure/azure-pipelines.yml
+++ b/tests/azure/azure-pipelines.yml
@@ -3,7 +3,7 @@ trigger:
 - master
 
 pool:
-  vmImage: 'ubuntu-latest'
+  vmImage: 'ubuntu-20.04'
 
 stages:
 
diff --git a/tests/azure/nightly.yml b/tests/azure/nightly.yml
index dc5f758a..e1a7cecf 100644
--- a/tests/azure/nightly.yml
+++ b/tests/azure/nightly.yml
@@ -10,7 +10,7 @@ schedules:
 trigger: none
 
 pool:
-  vmImage: 'ubuntu-latest'
+  vmImage: 'ubuntu-20.04'
 
 stages:
 
diff --git a/tests/azure/pr-pipeline.yml b/tests/azure/pr-pipeline.yml
index 0ca82912..8394deb7 100644
--- a/tests/azure/pr-pipeline.yml
+++ b/tests/azure/pr-pipeline.yml
@@ -3,7 +3,7 @@ trigger:
 - master
 
 pool:
-  vmImage: 'ubuntu-latest'
+  vmImage: 'ubuntu-20.04'
 
 stages: