diff --git a/build/azure-pipelines.yml b/build/azure-pipelines.yml
index 1ba32a3e8f..f235530d03 100644
--- a/build/azure-pipelines.yml
+++ b/build/azure-pipelines.yml
@@ -22,7 +22,7 @@ stages:
     - task: UseDotNet@2
       displayName: 'Use .Net Core sdk 3.1.x'
       inputs:
-        version: 3.1.x
+        version: 3.1.100
   
     - task: DotNetCoreCLI@2
       displayName: 'dotnet test'
@@ -43,7 +43,7 @@ stages:
     - task: UseDotNet@2
       displayName: 'Use .Net Core sdk 3.1.x'
       inputs:
-        version: 3.1.x
+        version: 3.1.100
   
     - task: DotNetCoreCLI@2
       displayName: 'dotnet test'
@@ -167,7 +167,7 @@ stages:
     - task: UseDotNet@2
       displayName: 'Use .Net Core sdk 3.1.x'
       inputs:
-        version: 3.1.x
+        version: 3.1.100
 
     - task: DotNetCoreCLI@2
       displayName: 'dotnet build'