diff --git a/.Dockerfile.build.swp b/.Dockerfile.build.swp
new file mode 100644
index 0000000..2c5f461
Binary files /dev/null and b/.Dockerfile.build.swp differ
diff --git a/azurepipeline.yml b/azurepipeline.yml
index 3b65ce8..74a2d9f 100644
--- a/azurepipeline.yml
+++ b/azurepipeline.yml
@@ -10,7 +10,9 @@ pr:
 jobs:
 - job: Build
   pool:
-    vmImage: ubuntu-20.04
+    vmImage: ubuntu-latest
+  container:
+    image: sonicdev-microsoft.azurecr.io:443/sonic-slave-bookworm:latest
 
   variables:
     DIFF_COVER_CHECK_THRESHOLD: 80
@@ -56,10 +58,10 @@ jobs:
     - script: |
         set -ex
         # Install .NET CORE
-        curl -sSL https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
-        sudo apt-add-repository https://packages.microsoft.com/ubuntu/20.04/prod
+        wget https://packages.microsoft.com/config/debian/12/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
+        sudo dpkg -i packages-microsoft-prod.deb
         sudo apt-get update
-        sudo apt-get install -y dotnet-sdk-5.0
+        sudo apt-get install -y dotnet-sdk-9.0
       displayName: "Install .NET CORE"
 
     - task: PublishCodeCoverageResults@1
diff --git a/build.sh b/build.sh
index 4313ca6..722e8d7 100755
--- a/build.sh
+++ b/build.sh
@@ -1,5 +1,5 @@
 
-set -e
+set -ex
 
 # copy debian packages from sonic-buildimage
 #bash copy.sh