diff --git a/tools/ci_build/github/azure-pipelines/android-x86_64-crosscompile-ci-pipeline.yml b/tools/ci_build/github/azure-pipelines/android-x86_64-crosscompile-ci-pipeline.yml
index 2f59a901fa..11efeb6d89 100644
--- a/tools/ci_build/github/azure-pipelines/android-x86_64-crosscompile-ci-pipeline.yml
+++ b/tools/ci_build/github/azure-pipelines/android-x86_64-crosscompile-ci-pipeline.yml
@@ -1,7 +1,7 @@
 jobs:
 - job: Android_CI
   pool:
-    vmImage: 'macOS-10.15'
+    vmImage: 'macOS-11'
   timeoutInMinutes: 180
   steps:
   # Onnx has no 3.9 python package available yet, need to use python 3.8 to avoid build onnx package
diff --git a/tools/ci_build/github/azure-pipelines/mac-coreml-ci-pipeline.yml b/tools/ci_build/github/azure-pipelines/mac-coreml-ci-pipeline.yml
index 3bba118068..9ac929eedf 100644
--- a/tools/ci_build/github/azure-pipelines/mac-coreml-ci-pipeline.yml
+++ b/tools/ci_build/github/azure-pipelines/mac-coreml-ci-pipeline.yml
@@ -1,7 +1,7 @@
 jobs:
 - job: CoreML_CI
   pool:
-    vmImage: 'macOS-10.15'
+    vmImage: 'macOS-11'
   variables:
     MACOSX_DEPLOYMENT_TARGET: '10.14'
   timeoutInMinutes: 120
diff --git a/tools/ci_build/github/azure-pipelines/mac-ios-ci-pipeline.yml b/tools/ci_build/github/azure-pipelines/mac-ios-ci-pipeline.yml
index ba95ada12e..c7e547c9fe 100644
--- a/tools/ci_build/github/azure-pipelines/mac-ios-ci-pipeline.yml
+++ b/tools/ci_build/github/azure-pipelines/mac-ios-ci-pipeline.yml
@@ -1,7 +1,7 @@
 jobs:
 - job: iOS_CI_on_Mac
   pool:
-    vmImage: 'macOS-10.15'
+    vmImage: 'macOS-11'
   variables:
     MACOSX_DEPLOYMENT_TARGET: '10.14'
   timeoutInMinutes: 150
diff --git a/tools/ci_build/github/azure-pipelines/mac-ios-packaging-pipeline.yml b/tools/ci_build/github/azure-pipelines/mac-ios-packaging-pipeline.yml
index 2b2b212efb..14997049c5 100644
--- a/tools/ci_build/github/azure-pipelines/mac-ios-packaging-pipeline.yml
+++ b/tools/ci_build/github/azure-pipelines/mac-ios-packaging-pipeline.yml
@@ -16,7 +16,7 @@ jobs:
   displayName: "iOS Packaging"
 
   pool:
-    vmImage: "macOS-10.15"
+    vmImage: "macOS-11"
 
   timeoutInMinutes: 90
 
diff --git a/tools/ci_build/github/azure-pipelines/mac-objc-static-analysis-ci-pipeline.yml b/tools/ci_build/github/azure-pipelines/mac-objc-static-analysis-ci-pipeline.yml
index c61f71fd5c..290c1bdfe2 100644
--- a/tools/ci_build/github/azure-pipelines/mac-objc-static-analysis-ci-pipeline.yml
+++ b/tools/ci_build/github/azure-pipelines/mac-objc-static-analysis-ci-pipeline.yml
@@ -2,7 +2,7 @@ jobs:
 - job: ObjCStaticAnalysis
   
   pool:
-    vmImage: 'macOS-10.15'
+    vmImage: 'macOS-11'
   
   timeoutInMinutes: 60
 
diff --git a/tools/ci_build/github/azure-pipelines/nuget/templates/test_macos.yml b/tools/ci_build/github/azure-pipelines/nuget/templates/test_macos.yml
index d37978eafa..c4c6333cf5 100644
--- a/tools/ci_build/github/azure-pipelines/nuget/templates/test_macos.yml
+++ b/tools/ci_build/github/azure-pipelines/nuget/templates/test_macos.yml
@@ -6,7 +6,7 @@ jobs:
   workspace:
     clean: all
   pool:
-    vmImage: 'macOS-10.15'
+    vmImage: 'macOS-11'
   dependsOn:
   - NuGet_Packaging_${{ parameters.ArtifactSuffix }}
   condition: succeeded()
diff --git a/tools/ci_build/github/azure-pipelines/templates/android-java-api-aar-test.yml b/tools/ci_build/github/azure-pipelines/templates/android-java-api-aar-test.yml
index 5d156c0f9a..ff2cd6a07e 100644
--- a/tools/ci_build/github/azure-pipelines/templates/android-java-api-aar-test.yml
+++ b/tools/ci_build/github/azure-pipelines/templates/android-java-api-aar-test.yml
@@ -14,7 +14,7 @@ jobs:
   workspace:
     clean: all
   pool:
-    vmImage: 'macOS-10.15'
+    vmImage: 'macOS-11'
   variables:
   - name: runCodesignValidationInjection
     value: false
diff --git a/tools/ci_build/github/azure-pipelines/templates/c-api-cpu.yml b/tools/ci_build/github/azure-pipelines/templates/c-api-cpu.yml
index 83efd36bab..7619a31d12 100644
--- a/tools/ci_build/github/azure-pipelines/templates/c-api-cpu.yml
+++ b/tools/ci_build/github/azure-pipelines/templates/c-api-cpu.yml
@@ -111,7 +111,7 @@ jobs:
   variables:
     MACOSX_DEPLOYMENT_TARGET: '10.14'
   pool:
-    vmImage: 'macOS-10.15'
+    vmImage: 'macOS-11'
   timeoutInMinutes:  120
   steps:
     - template: set-version-number-variables-step.yml
@@ -188,7 +188,7 @@ jobs:
   workspace:
     clean: all
   pool:
-    vmImage: 'macOS-10.15'
+    vmImage: 'macOS-11'
   timeoutInMinutes:  180
   steps:
     - template: set-version-number-variables-step.yml
@@ -556,7 +556,7 @@ jobs:
 
 - template: ../nuget/templates/test_macos.yml
   parameters:
-    AgentPool : macOS-10.15
+    AgentPool : macOS-11
     ArtifactSuffix: 'CPU'
 
 - job: Publish_NuGet_Package_And_Report
@@ -776,7 +776,7 @@ jobs:
   workspace:
     clean: all
   pool:
-    vmImage: 'macOS-10.15'
+    vmImage: 'macOS-11'
   variables:
   - name: runCodesignValidationInjection
     value: false
diff --git a/tools/ci_build/github/azure-pipelines/templates/java-test-final-jar-step.yml b/tools/ci_build/github/azure-pipelines/templates/java-test-final-jar-step.yml
index 489c3a977c..8d2dd20c4c 100644
--- a/tools/ci_build/github/azure-pipelines/templates/java-test-final-jar-step.yml
+++ b/tools/ci_build/github/azure-pipelines/templates/java-test-final-jar-step.yml
@@ -34,7 +34,7 @@ parameters:
 - job: Test_Final_Jar_MacOs
   timeoutInMinutes:  60
   pool: 
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-11'
   condition: eq(parameters['RunMacOs'], 'true')
   steps:
       - task: DownloadPipelineArtifact@2
diff --git a/tools/ci_build/github/azure-pipelines/templates/mac-ci.yml b/tools/ci_build/github/azure-pipelines/templates/mac-ci.yml
index cbb739c3d2..05b2f3bb03 100644
--- a/tools/ci_build/github/azure-pipelines/templates/mac-ci.yml
+++ b/tools/ci_build/github/azure-pipelines/templates/mac-ci.yml
@@ -15,7 +15,7 @@ jobs:
     clean: all
   timeoutInMinutes:  150
   pool:
-    vmImage: 'macOS-10.15'
+    vmImage: 'macOS-11'
   variables:
     BuildCommand: ${{ parameters.BuildCommand }}
     ALLOW_RELEASED_ONNX_OPSET_ONLY: ${{ parameters.AllowReleasedOpsetOnly }}
diff --git a/tools/ci_build/github/azure-pipelines/templates/py-packaging-stage.yml b/tools/ci_build/github/azure-pipelines/templates/py-packaging-stage.yml
index abf1fb54c2..477f03d8a3 100644
--- a/tools/ci_build/github/azure-pipelines/templates/py-packaging-stage.yml
+++ b/tools/ci_build/github/azure-pipelines/templates/py-packaging-stage.yml
@@ -1008,7 +1008,7 @@ stages:
       workspace:
         clean: all
       pool:
-        vmImage: 'macOS-10.15'
+        vmImage: 'macOS-11'
       variables:
         MACOSX_DEPLOYMENT_TARGET: '10.14'
       strategy: