diff --git a/.github/workflows/code-coverage.yml b/.github/workflows/code-coverage.yml
index 5343365c..978f8ade 100644
--- a/.github/workflows/code-coverage.yml
+++ b/.github/workflows/code-coverage.yml
@@ -23,6 +23,10 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v2
+    - uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: '8.0.x'
+        dotnet-quality: 'preview'
 
     - name: Coverlet coverage unit test
       run: dotnet test -c Debug -p:coverletOutput=coverage.xml -p:CollectCoverage=true -p:CoverletOutputFormat=opencover -p:Threshold=80 -p:ThresholdStat=Total -p:ExcludeByAttribute=\"Obsolete,GeneratedCodeAttribute,CompilerGeneratedAttribute\" -p:Exclude=\"[Arcus.EventGrid.Tests.*]*\" src/Arcus.EventGrid.Tests.Unit/Arcus.EventGrid.Tests.Unit.csproj
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index ffe9dedf..3ff92d55 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -39,6 +39,10 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v2
+    - uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: '8.0.x'
+        dotnet-quality: 'preview'
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/build/ci-build.yml b/build/ci-build.yml
index 3e1913cb..d68cd48f 100644
--- a/build/ci-build.yml
+++ b/build/ci-build.yml
@@ -51,6 +51,7 @@ stages:
             parameters:
               dotnetSdkVersion: '$(DotNet.Sdk.Version)'
               versionSuffix: '$(packageVersion)'
+              includePreviewVersions: true
           - task: CopyFiles@2
             displayName: 'Copy build artifacts'
             inputs:
@@ -85,6 +86,7 @@ stages:
           - template: test/run-unit-tests.yml@templates
             parameters:
               dotnetSdkVersion: '$(DotNet.Sdk.Version)'
+              includePreviewVersions: true
               projectName: '$(Project).Tests.Unit'
 
   - stage: IntegrationTests
@@ -110,6 +112,7 @@ stages:
           - template: test/run-integration-tests.yml@templates
             parameters:
               dotnetSdkVersion: '$(DotNet.Sdk.Version)'
+              includePreviewVersions: true
               projectName: '$(Project).Tests.Integration'
 
   - stage: ReleaseToMyget
diff --git a/build/nuget-release.yml b/build/nuget-release.yml
index 4b9d1233..463543ed 100644
--- a/build/nuget-release.yml
+++ b/build/nuget-release.yml
@@ -40,6 +40,7 @@ stages:
             parameters:
               dotnetSdkVersion: '$(DotNet.Sdk.Version)'
               version: '$(Build.BuildNumber)'
+              includePreviewVersions: true
           - task: CopyFiles@2
             displayName: 'Copy build artifacts'
             inputs:
@@ -74,6 +75,7 @@ stages:
           - template: test/run-unit-tests.yml@templates
             parameters:
               dotnetSdkVersion: '$(DotNet.Sdk.Version)'
+              includePreviewVersions: true
               projectName: '$(Project).Tests.Unit'
 
   - stage: IntegrationTests
@@ -99,6 +101,7 @@ stages:
           - template: test/run-integration-tests.yml@templates
             parameters:
               dotnetSdkVersion: '$(DotNet.Sdk.Version)'
+              includePreviewVersions: true
               projectName: '$(Project).Tests.Integration'
 
   - stage: Release
diff --git a/build/variables/build.yml b/build/variables/build.yml
index a7475ca7..610e41b9 100644
--- a/build/variables/build.yml
+++ b/build/variables/build.yml
@@ -1,5 +1,5 @@
 variables:
-  DotNet.Sdk.Version: '6.0.100'
-  DotNet.Sdk.VersionBC: '3.1.201'
+  DotNet.Sdk.Version: '8.0.x'
+  DotNet.Sdk.VersionBC: '6.0.100'
   Project: 'Arcus.EventGrid'
   Vm.Image: 'ubuntu-latest'
\ No newline at end of file
diff --git a/src/Arcus.EventGrid.Core/Arcus.EventGrid.Core.csproj b/src/Arcus.EventGrid.Core/Arcus.EventGrid.Core.csproj
index 28feec40..4f18829d 100644
--- a/src/Arcus.EventGrid.Core/Arcus.EventGrid.Core.csproj
+++ b/src/Arcus.EventGrid.Core/Arcus.EventGrid.Core.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;netcoreapp3.1;netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>net8.0;net6.0;netstandard2.1</TargetFrameworks>
     <Authors>Arcus</Authors>
     <Company>Arcus</Company>
     <PackageProjectUrl>https://eventgrid.arcus-azure.net/</PackageProjectUrl>
@@ -17,20 +17,25 @@
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
+  <PropertyGroup>
+    <!-- Temporary disable preview package usage warning as we are building our preview Arcus .NET 8 package, will be removed once we have a new major Arcus package -->
+    <NoWarn>NU5104</NoWarn>
+  </PropertyGroup>
+
   <ItemGroup>
     <None Include="..\..\README.md" Pack="true" PackagePath="\" />
     <None Include="..\..\LICENSE" Pack="true" PackagePath="\" />
     <None Include="..\..\docs\static\img\icon.png" Pack="true" PackagePath="\"/>
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' != 'net6.0'">
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.1'">
     <PackageReference Include="System.Text.Json" Version="6.0.5" />
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Arcus.Observability.Correlation" Version="[2.5.0,3.0.0)" />
-    <PackageReference Include="Arcus.Observability.Telemetry.Core" Version="[2.5.0,3.0.0)" />
-    <PackageReference Include="Arcus.Security.Core" Version="[1.9.0,2.0.0)" />
+    <PackageReference Include="Arcus.Observability.Correlation" Version="[3.0.0-preview-1-net8.0,4.0.0)" />
+    <PackageReference Include="Arcus.Observability.Telemetry.Core" Version="[3.0.0-preview-1-net8.0,4.0.0)" />
+    <PackageReference Include="Arcus.Security.Core" Version="[2.0.0-preview-1-net8.0,3.0.0)" />
     <PackageReference Include="Azure.Messaging.EventGrid" Version="4.11.0" />
     <PackageReference Include="Microsoft.Extensions.Azure" Version="1.3.0" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="6.0.0" />
diff --git a/src/Arcus.EventGrid.Security.AzureFunctions/Arcus.EventGrid.Security.AzureFunctions.csproj b/src/Arcus.EventGrid.Security.AzureFunctions/Arcus.EventGrid.Security.AzureFunctions.csproj
index 067ab1af..f597c59a 100644
--- a/src/Arcus.EventGrid.Security.AzureFunctions/Arcus.EventGrid.Security.AzureFunctions.csproj
+++ b/src/Arcus.EventGrid.Security.AzureFunctions/Arcus.EventGrid.Security.AzureFunctions.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net8.0;net6.0</TargetFrameworks>
     <Copyright>Copyright (c) Arcus</Copyright>
     <PackageProjectUrl>https://eventgrid.arcus-azure.net/</PackageProjectUrl>
     <RepositoryUrl>https://github.com/arcus-azure/arcus.eventgrid</RepositoryUrl>
@@ -19,7 +19,7 @@
   <ItemGroup>
     <None Include="..\..\README.md" Pack="true" PackagePath="\" />
     <None Include="..\..\LICENSE" Pack="true" PackagePath="\" />
-    <None Include="..\..\docs\static\img\icon.png" Pack="true" PackagePath="\"/>
+    <None Include="..\..\docs\static\img\icon.png" Pack="true" PackagePath="\" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Arcus.EventGrid.Security.Core/Arcus.EventGrid.Security.Core.csproj b/src/Arcus.EventGrid.Security.Core/Arcus.EventGrid.Security.Core.csproj
index 7cffcc9a..ae2deb58 100644
--- a/src/Arcus.EventGrid.Security.Core/Arcus.EventGrid.Security.Core.csproj
+++ b/src/Arcus.EventGrid.Security.Core/Arcus.EventGrid.Security.Core.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net8.0;net6.0</TargetFrameworks>
     <Copyright>Copyright (c) Arcus</Copyright>
     <PackageProjectUrl>https://eventgrid.arcus-azure.net/</PackageProjectUrl>
     <RepositoryUrl>https://github.com/arcus-azure/arcus.eventgrid</RepositoryUrl>
@@ -22,12 +22,8 @@
     <None Include="..\..\docs\static\img\icon.png" Pack="true" PackagePath="\"/>
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
-    <PackageReference Include="Guard.NET" Version="2.0.0" />
-  </ItemGroup>
-
-  <ItemGroup Condition="'$(TargetFramework)' != 'net6.0'">
-    <PackageReference Include="Guard.NET" Version="1.2.0" />
+  <ItemGroup>
+    <PackageReference Include="Guard.NET" Version="3.0.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Arcus.EventGrid.Security.Core/Validation/EventGridSubscriptionValidator.cs b/src/Arcus.EventGrid.Security.Core/Validation/EventGridSubscriptionValidator.cs
index ba6d14a5..90e7655b 100644
--- a/src/Arcus.EventGrid.Security.Core/Validation/EventGridSubscriptionValidator.cs
+++ b/src/Arcus.EventGrid.Security.Core/Validation/EventGridSubscriptionValidator.cs
@@ -45,8 +45,8 @@ public IActionResult ValidateCloudEventsHandshakeRequest(HttpRequest request)
             if (request.Headers.TryGetValue(headerName, out StringValues requestOrigins))
             {
                 // TODO: configurable rate?
-                request.HttpContext.Response.Headers.Add("WebHook-Allowed-Rate", "*");
-                request.HttpContext.Response.Headers.Add("WebHook-Allowed-Origin", requestOrigins);
+                request.HttpContext.Response.Headers["WebHook-Allowed-Rate"] = "*";
+                request.HttpContext.Response.Headers["WebHook-Allowed-Origin"] = requestOrigins;
 
                 return new OkResult();
             }
diff --git a/src/Arcus.EventGrid.Security.WebApi/Arcus.EventGrid.Security.WebApi.csproj b/src/Arcus.EventGrid.Security.WebApi/Arcus.EventGrid.Security.WebApi.csproj
index 46a095d7..1f20912c 100644
--- a/src/Arcus.EventGrid.Security.WebApi/Arcus.EventGrid.Security.WebApi.csproj
+++ b/src/Arcus.EventGrid.Security.WebApi/Arcus.EventGrid.Security.WebApi.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net8.0;net6.0</TargetFrameworks>
     <Copyright>Copyright (c) Arcus</Copyright>
     <PackageProjectUrl>https://eventgrid.arcus-azure.net/</PackageProjectUrl>
     <RepositoryUrl>https://github.com/arcus-azure/arcus.eventgrid</RepositoryUrl>
@@ -16,22 +16,21 @@
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
+  <PropertyGroup>
+    <!-- Temporary disable preview package usage warning as we are building our preview Arcus .NET 8 package, will be removed once we have a new major Arcus package -->
+    <NoWarn>NU5104</NoWarn>
+  </PropertyGroup>
+
   <ItemGroup>
     <None Include="..\..\README.md" Pack="true" PackagePath="\" />
     <None Include="..\..\LICENSE" Pack="true" PackagePath="\" />
     <None Include="..\..\docs\static\img\icon.png" Pack="true" PackagePath="\"/>
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
-    <PackageReference Include="Arcus.Observability.Telemetry.Core" Version="[2.4.0,3.0.0)" />
-    <PackageReference Include="Arcus.Security.Core" Version="[1.7.0,2.0.0)" />
-    <PackageReference Include="Guard.NET" Version="2.0.0" />
-  </ItemGroup>
-
-  <ItemGroup Condition="'$(TargetFramework)' != 'net6.0'">
-    <PackageReference Include="Arcus.Observability.Telemetry.Core" Version="[2.0.0,3.0.0)" />
-    <PackageReference Include="Arcus.Security.Core" Version="[1.4.0,2.0.0)" />
-    <PackageReference Include="Guard.NET" Version="1.2.0" />
+  <ItemGroup>
+    <PackageReference Include="Arcus.Observability.Telemetry.Core" Version="[3.0.0-preview-1-net8.0,4.0.0)" />
+    <PackageReference Include="Arcus.Security.Core" Version="[2.0.0-preview-1-net8.0,3.0.0)" />
+    <PackageReference Include="Guard.NET" Version="3.0.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Arcus.EventGrid.Testing/Arcus.EventGrid.Testing.csproj b/src/Arcus.EventGrid.Testing/Arcus.EventGrid.Testing.csproj
index 6d24d154..e8ffd935 100644
--- a/src/Arcus.EventGrid.Testing/Arcus.EventGrid.Testing.csproj
+++ b/src/Arcus.EventGrid.Testing/Arcus.EventGrid.Testing.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net8.0;net6.0</TargetFrameworks>
     <Authors>Arcus</Authors>
     <Copyright>Copyright (c) Arcus</Copyright>
     <PackageProjectUrl>https://eventgrid.arcus-azure.net/</PackageProjectUrl>
@@ -22,18 +22,12 @@
     <None Include="..\..\docs\static\img\icon.png" Pack="true" PackagePath="\"/>
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
-    <PackageReference Include="Guard.NET" Version="2.0.0" />
+  <ItemGroup>
+    <PackageReference Include="Guard.NET" Version="3.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="6.0.0" />
     <PackageReference Include="Azure.Messaging.ServiceBus" Version="7.2.0" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' != 'net6.0'">
-    <PackageReference Include="Guard.NET" Version="1.2.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="3.1.8" />
-    <PackageReference Include="Azure.Messaging.ServiceBus" Version="7.0.0" />
-  </ItemGroup>
-
   <ItemGroup>
     <!-- Deprecated packages -->
     <PackageReference Include="Arcus.EventGrid" Version="3.3.0" />
diff --git a/src/Arcus.EventGrid.Testing/Infrastructure/Hosts/EventConsumerHost.cs b/src/Arcus.EventGrid.Testing/Infrastructure/Hosts/EventConsumerHost.cs
index eb59818a..7bdbcab4 100644
--- a/src/Arcus.EventGrid.Testing/Infrastructure/Hosts/EventConsumerHost.cs
+++ b/src/Arcus.EventGrid.Testing/Infrastructure/Hosts/EventConsumerHost.cs
@@ -13,10 +13,8 @@
 using Newtonsoft.Json;
 using Polly;
 using Polly.Timeout;
-#if NET6_0
 using NewCloudEvent = Azure.Messaging.CloudEvent;
 using NewEventGridEvent = Azure.Messaging.EventGrid.EventGridEvent; 
-#endif
 using OldCloudEvent = CloudNative.CloudEvents.CloudEvent;
 using OldEventGridEvent = Microsoft.Azure.EventGrid.Models.EventGridEvent;
 
@@ -157,7 +155,6 @@ public string GetReceivedEvent(string eventId, TimeSpan timeout)
             return result.Result;
         }
 
-#if NET6_0
         /// <summary>
         /// Gets the event envelope that includes a requested event (uses timeout).
         /// </summary>
@@ -200,7 +197,6 @@ public NewCloudEvent GetReceivedEvent(Func<NewCloudEvent, bool> cloudEventFilter
 
             return result.Result;
         } 
-#endif
 
         /// <summary>
         /// Gets the event envelope that includes a requested event (uses timeout).
@@ -215,9 +211,7 @@ public NewCloudEvent GetReceivedEvent(Func<NewCloudEvent, bool> cloudEventFilter
         /// <exception cref="TimeoutException">
         ///     Thrown when no event could be received within the specified <paramref name="timeout"/> time range that matches the given <paramref name="cloudEventFilter"/>.
         /// </exception>
-#if NET6_0
         [Obsolete("Use 'CloudEvent' overload from 'Azure.Messaging.EventGrid' package")] 
-#endif
         public OldCloudEvent GetReceivedEvent(Func<OldCloudEvent, bool> cloudEventFilter, TimeSpan timeout)
         {
             Guard.NotNull(cloudEventFilter, nameof(cloudEventFilter), "Requires a function to filter out received CloudEvent events");
@@ -245,7 +239,6 @@ public OldCloudEvent GetReceivedEvent(Func<OldCloudEvent, bool> cloudEventFilter
             return result.Result;
         }
 
-#if NET6_0
         /// <summary>
         /// Gets the event envelope that includes a requested event (uses timeout).
         /// </summary>
@@ -287,8 +280,7 @@ public NewEventGridEvent GetReceivedEvent(Func<NewEventGridEvent, bool> eventGri
             }
 
             return result.Result;
-        } 
-#endif
+        }
 
         /// <summary>
         /// Gets the event envelope that includes a requested event (uses timeout).
@@ -303,9 +295,7 @@ public NewEventGridEvent GetReceivedEvent(Func<NewEventGridEvent, bool> eventGri
         /// <exception cref="TimeoutException">
         ///     Thrown when no event could be received within the specified <paramref name="timeout"/> time range that matches the given <paramref name="eventGridEventFilter"/>.
         /// </exception>
-#if NET6_0
         [Obsolete("Use 'EventGridEvent' overload from 'Azure.Messaging.EventGrid' package")] 
-#endif
         public OldEventGridEvent GetReceivedEvent(Func<OldEventGridEvent, bool> eventGridEventFilter, TimeSpan timeout)
         {
             Guard.NotNull(eventGridEventFilter, nameof(eventGridEventFilter), "Requires a function to filter out received CloudEvent events");
@@ -347,9 +337,7 @@ public OldEventGridEvent GetReceivedEvent(Func<OldEventGridEvent, bool> eventGri
         ///     Thrown when no event could be retrieved within the specified <paramref name="timeout"/> time range
         ///     whose event payload matches the given <paramref name="eventPayloadFilter"/>.
         /// </exception>
-#if NET6_0
         [Obsolete("Use either 'CloudEvent' or 'EventGridEvent' overloads")]
-#endif
         public Event GetReceivedEvent<TEventPayload>(Func<TEventPayload, bool> eventPayloadFilter, TimeSpan timeout)
         {
             Guard.NotNull(eventPayloadFilter, nameof(eventPayloadFilter), "Requires a function to filter out received CloudEvent events");
@@ -402,7 +390,6 @@ private static Policy<TResult> CreateTimeoutPolicy<TResult>(Func<TResult, bool>
             return timeoutPolicy;
         }
 
- #if NET6_0
         private TEvent TryGetReceivedEvent<TEvent>(
             Func<string, TEvent> eventParser,
             Func<TEvent, bool> eventFilter)
@@ -438,7 +425,6 @@ private TEvent TryGetReceivedEvent<TEvent>(
 
             return null;
         }
-#endif
 
         private Event TryGetReceivedEvent(Func<Event, bool> eventFilter)
         {
diff --git a/src/Arcus.EventGrid.Tests.Core/Arcus.EventGrid.Tests.Core.csproj b/src/Arcus.EventGrid.Tests.Core/Arcus.EventGrid.Tests.Core.csproj
index f07e4137..8af80af5 100644
--- a/src/Arcus.EventGrid.Tests.Core/Arcus.EventGrid.Tests.Core.csproj
+++ b/src/Arcus.EventGrid.Tests.Core/Arcus.EventGrid.Tests.Core.csproj
@@ -1,11 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Guard.Net" Version="2.0.0" />
+    <PackageReference Include="Guard.Net" Version="3.0.0" />
     <PackageReference Include="xunit.assert" Version="2.4.0" />
     <PackageReference Include="Azure.Messaging.EventGrid" Version="4.11.0" />
   </ItemGroup>
diff --git a/src/Arcus.EventGrid.Tests.Integration/Arcus.EventGrid.Tests.Integration.csproj b/src/Arcus.EventGrid.Tests.Integration/Arcus.EventGrid.Tests.Integration.csproj
index 7c4277ad..a4639b9a 100644
--- a/src/Arcus.EventGrid.Tests.Integration/Arcus.EventGrid.Tests.Integration.csproj
+++ b/src/Arcus.EventGrid.Tests.Integration/Arcus.EventGrid.Tests.Integration.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/Arcus.EventGrid.Tests.Unit/Arcus.EventGrid.Tests.Unit.csproj b/src/Arcus.EventGrid.Tests.Unit/Arcus.EventGrid.Tests.Unit.csproj
index 67324cf8..36742f8f 100644
--- a/src/Arcus.EventGrid.Tests.Unit/Arcus.EventGrid.Tests.Unit.csproj
+++ b/src/Arcus.EventGrid.Tests.Unit/Arcus.EventGrid.Tests.Unit.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <IsPackable>false</IsPackable>
   </PropertyGroup>