diff --git a/.azure-pipelines/build-job.yml b/.azure-pipelines/build-job.yml
index 9137d159fd..02c5233de2 100644
--- a/.azure-pipelines/build-job.yml
+++ b/.azure-pipelines/build-job.yml
@@ -13,6 +13,9 @@ parameters:
 - name: container
   type: string
 
+- name: targetFramework
+  type: string
+
 - name: timeoutInMinutes
   type: number
 
@@ -78,6 +81,14 @@ jobs:
   displayName: ${{ parameters.displayName }}
   pool: ${{ parameters.pool }}
   timeoutInMinutes: ${{ parameters.timeoutInMinutes }}
+  ${{ if eq(parameters.targetFramework, 'all') }}:
+    strategy:
+      matrix:
+        NET6.0:
+          targetFramework: 'net6.0'
+        NET8.0:
+          targetFramework: 'net8.0'
+
 
   ${{ if ne(parameters.container, '') }}:
     container: ${{ parameters.container }}
@@ -100,6 +111,8 @@ jobs:
     DisableDockerDetector: true
     nugetMultiFeedWarnLevel: none
     CheckoutBranch: ${{ parameters.branch }}
+    ${{ if ne(parameters.targetFramework, 'all') }}:
+      targetFramework: ${{ parameters.targetFramework }}
   templateContext:
     outputs:
     - ${{ if or(parameters.unitTests, parameters.functionalTests) }}:
@@ -150,7 +163,7 @@ jobs:
   - task: NuGetAuthenticate@1
 
   # Build agent layout
-  - script: ${{ variables.devCommand }} layout Release ${{ parameters.os }}-${{ parameters.arch }}
+  - script: ${{ variables.devCommand }} layout $(targetFramework) Release ${{ parameters.os }}-${{ parameters.arch }}
     workingDirectory: src
     displayName: Build & Layout Release
     retryCountOnTaskFailure: 5
@@ -175,7 +188,7 @@ jobs:
           installationPath: 'C:\Program Files (x86)\dotnet'
         env:
           PROCESSOR_ARCHITECTURE: x86
-    - script: ${{ variables.devCommand }} testl0 Debug ${{ parameters.os }}-${{ parameters.arch }}
+    - script: ${{ variables.devCommand }} testl0 $(targetFramework) Debug ${{ parameters.os }}-${{ parameters.arch }}
       workingDirectory: src
       displayName: Unit tests
       timeoutInMinutes: 5
@@ -189,7 +202,7 @@ jobs:
           version: '6.0.424'
           packageType: sdk
           performMultiLevelLookup: true
-    - script: ${{ variables.devCommand }} testl1 Debug ${{ parameters.os }}-${{ parameters.arch }}
+    - script: ${{ variables.devCommand }} testl1 $(targetFramework) Debug ${{ parameters.os }}-${{ parameters.arch }}
       workingDirectory: src
       displayName: Functional tests
 
@@ -242,11 +255,11 @@ jobs:
           flavor: ${{ parameters.arch }}
 
     # Create agent package zip
-    - script: "${{ variables.devCommand }} package Release ${{ parameters.os }}-${{ parameters.arch }}"
+    - script: "${{ variables.devCommand }} package $(targetFramework) Release ${{ parameters.os }}-${{ parameters.arch }}"
       workingDirectory: src
       displayName: Package Release
 
-    - script: "${{ variables.devCommand }} hash Release ${{ parameters.os }}-${{ parameters.arch }}"
+    - script: "${{ variables.devCommand }} hash $(targetFramework) Release ${{ parameters.os }}-${{ parameters.arch }}"
       workingDirectory: src
       displayName: Hash Package
 
diff --git a/.azure-pipelines/build-jobs.yml b/.azure-pipelines/build-jobs.yml
index 22d58112b9..9ad597440f 100644
--- a/.azure-pipelines/build-jobs.yml
+++ b/.azure-pipelines/build-jobs.yml
@@ -15,6 +15,9 @@ parameters:
   type: string
   default: ''
 
+- name: targetFramework
+  type: string
+
 - name: timeoutInMinutes
   type: number
   default: 120
@@ -81,6 +84,7 @@ jobs:
     verifySigning: ${{ parameters.verifySigning }}
     publishArtifact: ${{ parameters.publishArtifacts }}
     packageType: agent
+    targetFramework: ${{ parameters.targetFramework }}
 
 - ${{ if parameters.buildAlternatePackage }}:
   - template: /.azure-pipelines/build-job.yml@self
@@ -99,4 +103,5 @@ jobs:
       sign: ${{ parameters.sign }}
       verifySigning: ${{ parameters.verifySigning }}
       publishArtifact: ${{ parameters.publishArtifacts }}
-      packageType: pipelines-agent
\ No newline at end of file
+      packageType: pipelines-agent
+      targetFramework: ${{ parameters.targetFramework }}
\ No newline at end of file
diff --git a/.azure-pipelines/pipeline.yml b/.azure-pipelines/pipeline.yml
index efe5230421..cdb2d004ce 100644
--- a/.azure-pipelines/pipeline.yml
+++ b/.azure-pipelines/pipeline.yml
@@ -1,6 +1,9 @@
 # This Yaml Document has been converted by ESAI Yaml Pipeline Conversion Tool.
 # This pipeline will be extended to the OneESPT template
 parameters:
+- name: targetFramework
+  type: string
+  default: all
 - name: preBuildStages
   type: stageList
   default: []
@@ -102,6 +105,13 @@ extends:
       - ${{ if parameters.testProxyAgent }}:
         - job: test_proxy_agent
           displayName: Test Proxy Agent
+          ${{ if eq(parameters.targetFramework, 'all') }}:
+            strategy:
+              matrix:
+                NET6.0:
+                  targetFramework: 'net6.0'
+                NET8.0:
+                  targetFramework: 'net8.0'
           pool:
               name: 1ES-ABTT-Shared-Pool
               image: abtt-ubuntu-2204
@@ -109,6 +119,8 @@ extends:
           variables:
             DisableDockerDetector: true
             nugetMultiFeedWarnLevel: none
+            ${{ if ne(parameters.targetFramework, 'all') }}:
+              targetFramework: ${{ parameters.targetFramework }}
           timeoutInMinutes: 300
           steps:
           - template: /.azure-pipelines/get-pat.yml@self
@@ -120,12 +132,13 @@ extends:
               sourceBranch="$(Build.SourceBranch)"
               branch="${releaseBranch:-"${sourceBranch}"}"
               echo "Canary \"branch\" parameter: \"${branch}\""
+              echo "Canary \"target_framework\" parameter: \"$(targetFramework)\""
 
               node ./run-and-verify.js \
                   --projectUrl "$(CANARY_PROJECT_URL)" \
                   --pipelineId "$(CANARY_PIPELINE_ID)" \
                   --token "$(ACCESS_TOKEN)" \
-                  --templateParameters "{ \"branch\": \"${branch}\" }"
+                  --templateParameters "{ \"branch\": \"${branch}\", \"target_framework\": \"$(targetFramework)\"}"
             displayName: Test Proxy Agent
 
   # Windows (x64)
@@ -148,6 +161,7 @@ extends:
             verifySigning: ${{ parameters.sign }}
             publishArtifacts: ${{ parameters.publishArtifacts }}
             buildAlternatePackage: ${{ parameters.buildAlternatePackage }}
+            targetFramework: ${{ parameters.targetFramework }}
 
   # Windows (x86)
       - ${{ if parameters.win_x86 }}:
@@ -167,6 +181,7 @@ extends:
             sign: ${{ parameters.sign }}
             publishArtifacts: ${{ parameters.publishArtifacts }}
             buildAlternatePackage: ${{ parameters.buildAlternatePackage }}
+            targetFramework: ${{ parameters.targetFramework }}
 
   # Linux (x64)
       - ${{ if parameters.linux_x64 }}:
@@ -186,6 +201,7 @@ extends:
             sign: ${{ parameters.sign }}
             publishArtifacts: ${{ parameters.publishArtifacts }}
             buildAlternatePackage: ${{ parameters.buildAlternatePackage }}
+            targetFramework: ${{ parameters.targetFramework }}
 
   # Linux (ARM)
       - ${{ if parameters.linux_arm }}:
@@ -206,6 +222,7 @@ extends:
             sign: false
             publishArtifacts: ${{ parameters.publishArtifacts }}
             buildAlternatePackage: ${{ parameters.buildAlternatePackage }}
+            targetFramework: ${{ parameters.targetFramework }}
 
   # Linux (ARM64)
       - ${{ if parameters.linux_arm64 }}:
@@ -226,6 +243,7 @@ extends:
             sign: false
             publishArtifacts: ${{ parameters.publishArtifacts }}
             buildAlternatePackage: ${{ parameters.buildAlternatePackage }}
+            targetFramework: ${{ parameters.targetFramework }}
 
   # Alpine (x64)
       - ${{ if parameters.alpine_x64 }}:
@@ -246,6 +264,7 @@ extends:
             sign: false
             publishArtifacts: ${{ parameters.publishArtifacts }}
             buildAlternatePackage: false
+            targetFramework: ${{ parameters.targetFramework }}
 
   # Alpine (ARM64)
       - ${{ if parameters.alpine_arm64 }}:
@@ -266,6 +285,7 @@ extends:
             sign: false
             publishArtifacts: ${{ parameters.publishArtifacts }}
             buildAlternatePackage: false
+            targetFramework: ${{ parameters.targetFramework }}
 
   # macOS (x64)
       - ${{ if parameters.macOS_x64 }}:
@@ -286,6 +306,7 @@ extends:
             sign: ${{ parameters.sign }}
             publishArtifacts: ${{ parameters.publishArtifacts }}
             buildAlternatePackage: ${{ parameters.buildAlternatePackage }}
+            targetFramework: ${{ parameters.targetFramework }}
 
   # macOS (ARM64)
       - ${{ if parameters.macOS_arm64 }}:
@@ -306,4 +327,5 @@ extends:
             sign: ${{ parameters.sign }}
             publishArtifacts: ${{ parameters.publishArtifacts }}
             buildAlternatePackage: ${{ parameters.buildAlternatePackage }}
+            targetFramework: ${{ parameters.targetFramework }}
     - ${{ parameters.postBuildStages }}
\ No newline at end of file
diff --git a/.vsts.release.yml b/.vsts.release.yml
index 2004fe1be6..cede4fbfac 100644
--- a/.vsts.release.yml
+++ b/.vsts.release.yml
@@ -31,6 +31,13 @@ parameters:
   type: string
   displayName: Version
   default: 'NotSet'
+- name: targetFramework
+  displayName: Target framework
+  type: string
+  default: net6.0
+  values:
+  - net6.0
+  - net8.0
 - name: derivedFrom
   type: string
   displayName: Derived From Version
@@ -73,6 +80,7 @@ extends:
     test: ${{ not(parameters.skipTests) }}
     sign: true
     publishArtifacts: true
+    targetFramework: ${{ parameters.targetFramework }}
     testProxyAgent: ${{ parameters.testProxyAgent }}
     stageDependencies:
       - Verify_release
@@ -138,6 +146,13 @@ extends:
                 if ($agentVersion -eq 'NotSet') {
                   Write-Error "Version parameter is required for manual release." -ErrorAction Stop
                 }
+
+                ## Verify target framework for specified version
+                $majorVersion = $agentVersion.Split('.')[0]
+                if ((${{ parameters.targetFramework }} -eq "net6.0" -and $majorVersion -ne "3") -or
+                   (${{ parameters.targetFramework }} -eq "net8.0" -and $majorVersion -ne "4")) {
+                  Write-Error "The major version should be 3 for net6.0 and 4 for net8.0" -ErrorAction Stop
+                }
               }
               if ($isTestRun) {
                 $agentVersion = '3.000.999'
diff --git a/src/Agent.Listener/ValidationHelper/VerificationException.cs b/src/Agent.Listener/ValidationHelper/VerificationException.cs
index 155c6a2774..29a4ccb46c 100644
--- a/src/Agent.Listener/ValidationHelper/VerificationException.cs
+++ b/src/Agent.Listener/ValidationHelper/VerificationException.cs
@@ -19,9 +19,11 @@ public VerificationException(string message, Exception ex)
         {
         }
 
+#if NET6_0
         protected VerificationException(SerializationInfo info, StreamingContext context)
             : base(info, context)
         {
         }
+#endif
     }
 }
diff --git a/src/Common.props b/src/Common.props
index 0649f145b5..50f75de900 100644
--- a/src/Common.props
+++ b/src/Common.props
@@ -1,7 +1,7 @@
 <Project>
   <PropertyGroup>
-    <TargetFramework>net6</TargetFramework>
-    <RuntimeFrameworkVersion>6.0.32</RuntimeFrameworkVersion>
+    <TargetFramework>$(NetTargetFramework)</TargetFramework>
+    <RuntimeFrameworkVersion>$(RuntimeVersion)</RuntimeFrameworkVersion>
     <RuntimeIdentifier Condition="'$(BuildingInsideVisualStudio)' != 'true'">$(PackageRuntime)</RuntimeIdentifier>
     <SelfContained>true</SelfContained>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
diff --git a/src/dev.sh b/src/dev.sh
index 1877a8f775..96a4c90b99 100755
--- a/src/dev.sh
+++ b/src/dev.sh
@@ -8,21 +8,27 @@
 
 set -eo pipefail
 
+# .NET version for agent build.  
+NET_VERSIONS="
+net6.0-sdk=6.0.424
+net6.0-runtime=6.0.32
+
+net8.0-sdk=8.0.401
+net8.0-runtime=8.0.8"
+
 ALL_ARGS=("$@")
 DEV_CMD=$1
-DEV_CONFIG=$2
-DEV_RUNTIME_ID=$3
-DEV_TEST_FILTERS=$4
-DEV_ARGS=("${ALL_ARGS[@]:4}")
+TARGET_FRAMEWORK=$2
+DEV_CONFIG=$3
+DEV_RUNTIME_ID=$4
+DEV_TEST_FILTERS=$5
+DEV_ARGS=("${ALL_ARGS[@]:5}")
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 source "$SCRIPT_DIR/.helpers.sh"
 
 REPO_ROOT="${SCRIPT_DIR}/.."
-DOTNETSDK_ROOT="${REPO_ROOT}/_dotnetsdk"
-DOTNETSDK_VERSION="6.0.424"
-DOTNETSDK_INSTALLDIR="$DOTNETSDK_ROOT/$DOTNETSDK_VERSION"
 AGENT_VERSION=$(cat "$SCRIPT_DIR/agentversion" | head -n 1 | tr -d "\n\r")
 
 DOTNET_ERROR_PREFIX="##vso[task.logissue type=error]"
@@ -36,6 +42,27 @@ fi
 
 pushd "$SCRIPT_DIR"
 
+DEFAULT_TARGET_FRAMEWORK="net6.0"
+
+if [[ $TARGET_FRAMEWORK == "" ]]; then
+    TARGET_FRAMEWORK=$DEFAULT_TARGET_FRAMEWORK
+fi
+
+function get_net_version ()
+{
+    echo "$NET_VERSIONS" | grep -o "$1=[^ ]*" | cut -d '=' -f2
+}
+
+DOTNETSDK_VERSION=$(get_net_version "${TARGET_FRAMEWORK}-sdk")
+DOTNETRUNTIME_VERSION=$(get_net_version "${TARGET_FRAMEWORK}-runtime")
+
+if [[ ($DOTNETSDK_VERSION == "") || ($DOTNETRUNTIME_VERSION == "") ]]; then
+    failed "Incorrect target framework is specified"
+fi
+
+DOTNETSDK_ROOT="${REPO_ROOT}/_dotnetsdk"
+DOTNETSDK_INSTALLDIR="$DOTNETSDK_ROOT/$DOTNETSDK_VERSION"
+
 BUILD_CONFIG="Debug"
 if [[ "$DEV_CONFIG" == "Release" ]]; then
     BUILD_CONFIG="Release"
@@ -97,12 +124,12 @@ function make_build (){
 
     if  [[ "$ADO_ENABLE_LOGISSUE" == "true" ]]; then
 
-        dotnet msbuild -t:"${TARGET}" -p:PackageRuntime="${RUNTIME_ID}" -p:PackageType="${PACKAGE_TYPE}" -p:BUILDCONFIG="${BUILD_CONFIG}" -p:AgentVersion="${AGENT_VERSION}" -p:LayoutRoot="${LAYOUT_DIR}" -p:CodeAnalysis="true" \
+        dotnet msbuild -t:"${TARGET}" -p:PackageRuntime="${RUNTIME_ID}" -p:PackageType="${PACKAGE_TYPE}" -p:BUILDCONFIG="${BUILD_CONFIG}" -p:AgentVersion="${AGENT_VERSION}" -p:LayoutRoot="${LAYOUT_DIR}" -p:CodeAnalysis="true" -p:NetTargetFramework="${TARGET_FRAMEWORK}" -p:RuntimeVersion="${DOTNETRUNTIME_VERSION}" \
          | sed -e "/\: warning /s/^/${DOTNET_WARNING_PREFIX} /;" \
          | sed -e "/\: error /s/^/${DOTNET_ERROR_PREFIX} /;" \
          || failed build
     else
-        dotnet msbuild -t:"${TARGET}" -p:PackageRuntime="${RUNTIME_ID}" -p:PackageType="${PACKAGE_TYPE}" -p:BUILDCONFIG="${BUILD_CONFIG}" -p:AgentVersion="${AGENT_VERSION}" -p:LayoutRoot="${LAYOUT_DIR}" -p:CodeAnalysis="true" \
+        dotnet msbuild -t:"${TARGET}" -p:PackageRuntime="${RUNTIME_ID}" -p:PackageType="${PACKAGE_TYPE}" -p:BUILDCONFIG="${BUILD_CONFIG}" -p:AgentVersion="${AGENT_VERSION}" -p:LayoutRoot="${LAYOUT_DIR}" -p:CodeAnalysis="true" -p:NetTargetFramework="${TARGET_FRAMEWORK}" -p:RuntimeVersion="${DOTNETRUNTIME_VERSION}" \
          || failed build
     fi
 
@@ -149,7 +176,7 @@ function cmd_test_l0 ()
         TestFilters="$TestFilters&$DEV_TEST_FILTERS"
     fi
 
-    dotnet msbuild -t:testl0 -p:PackageRuntime="${RUNTIME_ID}" -p:PackageType="${PACKAGE_TYPE}" -p:BUILDCONFIG="${BUILD_CONFIG}" -p:AgentVersion="${AGENT_VERSION}" -p:LayoutRoot="${LAYOUT_DIR}" -p:TestFilters="${TestFilters}" "${DEV_ARGS[@]}" || failed "failed tests"
+    dotnet msbuild -t:testl0 -p:PackageRuntime="${RUNTIME_ID}" -p:PackageType="${PACKAGE_TYPE}" -p:BUILDCONFIG="${BUILD_CONFIG}" -p:AgentVersion="${AGENT_VERSION}" -p:LayoutRoot="${LAYOUT_DIR}" -p:TestFilters="${TestFilters}" -p:NetTargetFramework="${TARGET_FRAMEWORK}" "${DEV_ARGS[@]}" || failed "failed tests"
 }
 
 function cmd_test_l1 ()
@@ -171,7 +198,7 @@ function cmd_test_l1 ()
         TestFilters="$TestFilters&$DEV_TEST_FILTERS"
     fi
 
-    dotnet msbuild -t:testl1 -p:PackageRuntime="${RUNTIME_ID}" -p:PackageType="${PACKAGE_TYPE}" -p:BUILDCONFIG="${BUILD_CONFIG}" -p:AgentVersion="${AGENT_VERSION}" -p:LayoutRoot="${LAYOUT_DIR}" -p:TestFilters="${TestFilters}" "${DEV_ARGS[@]}" || failed "failed tests"
+    dotnet msbuild -t:testl1 -p:PackageRuntime="${RUNTIME_ID}" -p:PackageType="${PACKAGE_TYPE}" -p:BUILDCONFIG="${BUILD_CONFIG}" -p:AgentVersion="${AGENT_VERSION}" -p:LayoutRoot="${LAYOUT_DIR}" -p:TestFilters="${TestFilters}" -p:NetTargetFramework="${TARGET_FRAMEWORK}" -p:RuntimeVersion="${DOTNETRUNTIME_VERSION}" "${DEV_ARGS[@]}" || failed "failed tests"
 }
 
 function cmd_test ()
diff --git a/src/dir.proj b/src/dir.proj
index b6b7f2fad9..8d8395eedb 100644
--- a/src/dir.proj
+++ b/src/dir.proj
@@ -78,9 +78,9 @@
   </Target>
 
   <Target Name="TestL0" DependsOnTargets="GenerateConstant">
-    <Exec Command="dotnet build Test/Test.csproj -c $(BUILDCONFIG) /p:PackageRuntime=$(PackageRuntime) /p:SelfContained=false" ConsoleToMSBuild="true" />
-    <Exec Command="dotnet build Test/Test.csproj /t:CopyFilesL0" Condition="'$(PackageRuntime)' == 'win-x86'"/>
-    <Exec Command="dotnet test Test/Test.csproj --settings $(MSBuildProjectDirectory)/Test/CodeCoverage.runsettings --no-build --logger:trx --collect:&quot;Code Coverage&quot; --filter &quot;$(TestFilters)&quot; /p:PackageRuntime=$(PackageRuntime)" ConsoleToMSBuild="true" />
+    <Exec Command="dotnet build Test/Test.csproj -c $(BUILDCONFIG) /p:PackageRuntime=$(PackageRuntime) /p:SelfContained=false /p:NetTargetFramework=$(NetTargetFramework)" ConsoleToMSBuild="true" />
+    <Exec Command="dotnet build Test/Test.csproj /t:CopyFilesL0 /p:NetTargetFramework=$(NetTargetFramework)" Condition="'$(PackageRuntime)' == 'win-x86'"/>
+    <Exec Command="dotnet test Test/Test.csproj --settings $(MSBuildProjectDirectory)/Test/CodeCoverage.runsettings --no-build --logger:trx --collect:&quot;Code Coverage&quot; --filter &quot;$(TestFilters)&quot; /p:PackageRuntime=$(PackageRuntime) /p:NetTargetFramework=$(NetTargetFramework)" ConsoleToMSBuild="true" />
   </Target>
 
   <Target Name="TestL1" DependsOnTargets="GenerateConstant">
@@ -100,9 +100,9 @@
              StopOnFirstFailure="true"
              Properties="Configuration=$(BUILDCONFIG);PackageRuntime=$(PackageRuntime);Version=1.0.0.0;RuntimeIdentifier=$(PackageRuntime);PublishDir=$(L1Root)/bin" />
 
-    <Exec Command="dotnet build Test/Test.csproj -c $(BUILDCONFIG) /p:PackageRuntime=$(PackageRuntime) /p:SelfContained=false -o $(L1Root)/bin" ConsoleToMSBuild="true" />
-    <Exec Command="dotnet build Test/Test.csproj /t:CopyFilesL1" Condition="'$(PackageRuntime)' == 'win-x86'"/>
-    <Exec Command="dotnet test Test/Test.csproj -o $(L1Root)/bin --no-build --logger:trx --verbosity=detailed --filter &quot;$(TestFilters)&quot;" ConsoleToMSBuild="true" />
+    <Exec Command="dotnet build Test/Test.csproj -c $(BUILDCONFIG) /p:PackageRuntime=$(PackageRuntime) /p:SelfContained=false /p:NetTargetFramework=$(NetTargetFramework) /p:RuntimeVersion=$(RuntimeVersion) -o $(L1Root)/bin" ConsoleToMSBuild="true" />
+    <Exec Command="dotnet build Test/Test.csproj /t:CopyFilesL1 /p:NetTargetFramework=$(NetTargetFramework)" Condition="'$(PackageRuntime)' == 'win-x86'"/>
+    <Exec Command="dotnet test Test/Test.csproj /p:NetTargetFramework=$(NetTargetFramework) -o $(L1Root)/bin --no-build --logger:trx --verbosity=detailed --filter &quot;$(TestFilters)&quot;" ConsoleToMSBuild="true" />
   </Target>
 
   <Target Name="Layout" DependsOnTargets="Clean;Build">