diff --git a/tests/azure/azure-pipelines.yml b/tests/azure/azure-pipelines.yml
index 8c86ce14eb74594dbe504372affc56756ee82c4a..5d6c4ae49357e0eeb216ee2a9618c512cec7aba9 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 dc5f758af4e8cb395dad28b4016a266d326b705b..e1a7cecf9650147ba8e322611115d50fc8f975ae 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 0ca829127d3e30a94308769f76dc5d72aa55480b..8394deb71e9c4062a01ad59d7fbf11305278cf84 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: