diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b705d91..5df7969 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -24,7 +24,7 @@ jobs:
       - name: Install .NET SDK
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: '8.0.x'
+          dotnet-version: '9.0.x'
 
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - name: Checkout Repository
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index a8e0fb2..bc6b3f9 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -16,7 +16,7 @@ jobs:
     - name: Install .NET SDK
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: '8.0.x'
+        dotnet-version: '9.0.x'
 
     - name: Restore dependencies
       run: dotnet restore
diff --git a/global.json b/global.json
index 408e96b..d5bf446 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "8.0.201",
+    "version": "9.0.100",
     "rollForward": "latestFeature"
   }
 }
\ No newline at end of file
diff --git a/src/OwlCore.Kubo.csproj b/src/OwlCore.Kubo.csproj
index 74f57db..ce46740 100644
--- a/src/OwlCore.Kubo.csproj
+++ b/src/OwlCore.Kubo.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;net8.0;</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net8.0;net9.0</TargetFrameworks>
     <Nullable>enable</Nullable>
     <LangVersion>12.0</LangVersion>
     <WarningsAsErrors>nullable</WarningsAsErrors>
@@ -14,13 +14,19 @@
     <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
 
     <Author>Arlo Godfrey</Author>
-    <Version>0.19.0</Version>
+    <Version>0.19.1</Version>
     <Product>OwlCore</Product>
     <Description>
       An essential toolkit for Kubo, IPFS and the distributed web. 
     </Description>
     <PackageLicenseFile>LICENSE.txt</PackageLicenseFile>
     <PackageReleaseNotes>
+--- 0.19.1 ---
+[Improvements]
+Updated vulnerable System.Text.Json to latest stable 9.0.0.
+Updated Microsoft.Bcl.AsyncInterfaces to 9.0.0.
+Added net9.0 to supported TargetFrameworks.
+
 --- 0.19.0 ---
 [New]
 Added IAddFileToGetCid interface. This is functionally identical to IGetCid, but instead of simply returning a CID already in ipfs, it computes the CID by providing data to ipfs using preferences in the AddFileOptions parameter.
@@ -463,7 +469,7 @@ Added unit tests.
     <PackageReference Include="CommunityToolkit.Common" Version="8.3.2" />
     <PackageReference Include="CommunityToolkit.Diagnostics" Version="8.3.2" />
     <PackageReference Include="IpfsShipyard.Ipfs.Http.Client" Version="0.5.1" />
-    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="9.0.0" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
     <PackageReference Include="OwlCore.ComponentModel.Settings" Version="0.1.1" />
     <PackageReference Include="OwlCore.Diagnostics" Version="0.0.0" />
@@ -476,6 +482,6 @@ Added unit tests.
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="System.Linq.Async" Version="6.0.1" />
-    <PackageReference Include="System.Text.Json" Version="8.0.5" />
+    <PackageReference Include="System.Text.Json" Version="9.0.0" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/tests/OwlCore.Kubo.Tests/OwlCore.Kubo.Tests.csproj b/tests/OwlCore.Kubo.Tests/OwlCore.Kubo.Tests.csproj
index 247d00a..b71bb3f 100644
--- a/tests/OwlCore.Kubo.Tests/OwlCore.Kubo.Tests.csproj
+++ b/tests/OwlCore.Kubo.Tests/OwlCore.Kubo.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <LangVersion>12.0</LangVersion>