diff --git a/.azure/azure-ci-build-pipeline.yaml b/.azure/azure-ci-build-pipeline.yaml
index 8e1b0bca..4353b082 100644
--- a/.azure/azure-ci-build-pipeline.yaml
+++ b/.azure/azure-ci-build-pipeline.yaml
@@ -14,41 +14,41 @@ parameters:
   - name: matrix
     type: object
     default:
-    # - job_name: 'UbuntuPython39'
-    #   py: '3.9'
-    #   img: 'ubuntu-latest'
-    #   every_time: false
-    #   publish_coverage: false
+    - job_name: 'UbuntuPython39'
+      py: 'v3.9'
+      img: 'ubuntu-latest'
+      every_time: false
+      publish_coverage: false
     - job_name: 'UbuntuPython310'
       py: 'v3.10'
       img: 'ubuntu-latest'
       every_time: true
       publish_coverage: true
-    # - job_name: 'UbuntuPython311'
-    #   py: '3.11'
-    #   img: 'ubuntu-latest'
-    #   every_time: false
-    #   publish_coverage: false
-    # - job_name: 'WindowsPython39'
-    #   py: '3.9'
-    #   img: 'windows-latest'
-    #   every_time: false
-    #   publish_coverage: false
-    # - job_name: 'WindowsPython311'
-    #   py: '3.11'
-    #   img: 'windows-latest'
-    #   every_time: false
-    #   publish_coverage: false
-    # - job_name: 'MacOSPython39'
-    #   py: '3.9'
-    #   img: 'macOS-latest'
-    #   every_time: false
-    #   publish_coverage: false
-    # - job_name: 'MacOSPython311'
-    #   py: '3.11'
-    #   img: 'macOS-latest'
-    #   every_time: false
-    #   publish_coverage: false
+    - job_name: 'UbuntuPython311'
+      py: 'v3.11'
+      img: 'ubuntu-latest'
+      every_time: false
+      publish_coverage: false
+    - job_name: 'WindowsPython39'
+      py: 'v3.9'
+      img: 'windows-latest'
+      every_time: false
+      publish_coverage: false
+    - job_name: 'WindowsPython311'
+      py: 'v3.11'
+      img: 'windows-latest'
+      every_time: false
+      publish_coverage: false
+    - job_name: 'MacOSPython39'
+      py: 'v3.9'
+      img: 'macOS-latest'
+      every_time: false
+      publish_coverage: false
+    - job_name: 'MacOSPython311'
+      py: 'v3.11'
+      img: 'macOS-latest'
+      every_time: false
+      publish_coverage: false
 
 stages:
   - stage: Test