diff --git a/src/FunFair.BuildCheck.Helpers/FunFair.BuildCheck.Helpers.csproj b/src/FunFair.BuildCheck.Helpers/FunFair.BuildCheck.Helpers.csproj
index e7564a13..0a841909 100644
--- a/src/FunFair.BuildCheck.Helpers/FunFair.BuildCheck.Helpers.csproj
+++ b/src/FunFair.BuildCheck.Helpers/FunFair.BuildCheck.Helpers.csproj
@@ -26,7 +26,7 @@
     <OutputType>Library</OutputType>
     <RunAOTCompilation>false</RunAOTCompilation>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
-    <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     <TieredCompilation>true</TieredCompilation>
     <TieredPGO>true</TieredPGO>
     <TreatSpecificWarningsAsErrors />
diff --git a/src/FunFair.BuildCheck.Interfaces/FunFair.BuildCheck.Interfaces.csproj b/src/FunFair.BuildCheck.Interfaces/FunFair.BuildCheck.Interfaces.csproj
index 41f1e7ac..00075d68 100644
--- a/src/FunFair.BuildCheck.Interfaces/FunFair.BuildCheck.Interfaces.csproj
+++ b/src/FunFair.BuildCheck.Interfaces/FunFair.BuildCheck.Interfaces.csproj
@@ -26,7 +26,7 @@
     <OutputType>Library</OutputType>
     <RunAOTCompilation>false</RunAOTCompilation>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
-    <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     <TieredCompilation>true</TieredCompilation>
     <TieredPGO>true</TieredPGO>
     <TreatSpecificWarningsAsErrors />
diff --git a/src/FunFair.BuildCheck.ProjectChecks/FunFair.BuildCheck.ProjectChecks.csproj b/src/FunFair.BuildCheck.ProjectChecks/FunFair.BuildCheck.ProjectChecks.csproj
index 89b20dfd..a07ad20a 100644
--- a/src/FunFair.BuildCheck.ProjectChecks/FunFair.BuildCheck.ProjectChecks.csproj
+++ b/src/FunFair.BuildCheck.ProjectChecks/FunFair.BuildCheck.ProjectChecks.csproj
@@ -26,7 +26,7 @@
     <OutputType>Library</OutputType>
     <RunAOTCompilation>false</RunAOTCompilation>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
-    <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     <TieredCompilation>true</TieredCompilation>
     <TieredPGO>true</TieredPGO>
     <TreatSpecificWarningsAsErrors />
diff --git a/src/FunFair.BuildCheck.Runner.Tests/FunFair.BuildCheck.Runner.Tests.csproj b/src/FunFair.BuildCheck.Runner.Tests/FunFair.BuildCheck.Runner.Tests.csproj
index 4aad63c9..d470b935 100644
--- a/src/FunFair.BuildCheck.Runner.Tests/FunFair.BuildCheck.Runner.Tests.csproj
+++ b/src/FunFair.BuildCheck.Runner.Tests/FunFair.BuildCheck.Runner.Tests.csproj
@@ -24,7 +24,7 @@
     <OptimizationPreference>speed</OptimizationPreference>
     <OutputType>Library</OutputType>
     <RunAOTCompilation>false</RunAOTCompilation>
-    <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     <TieredCompilation>true</TieredCompilation>
     <TieredPGO>true</TieredPGO>
     <TreatSpecificWarningsAsErrors />
diff --git a/src/FunFair.BuildCheck.Runner/FunFair.BuildCheck.Runner.csproj b/src/FunFair.BuildCheck.Runner/FunFair.BuildCheck.Runner.csproj
index 0b4abdf6..d4d08188 100644
--- a/src/FunFair.BuildCheck.Runner/FunFair.BuildCheck.Runner.csproj
+++ b/src/FunFair.BuildCheck.Runner/FunFair.BuildCheck.Runner.csproj
@@ -26,7 +26,7 @@
     <OutputType>Library</OutputType>
     <RunAOTCompilation>false</RunAOTCompilation>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
-    <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     <TieredCompilation>true</TieredCompilation>
     <TieredPGO>true</TieredPGO>
     <TreatSpecificWarningsAsErrors />
diff --git a/src/FunFair.BuildCheck.SolutionChecks/FunFair.BuildCheck.SolutionChecks.csproj b/src/FunFair.BuildCheck.SolutionChecks/FunFair.BuildCheck.SolutionChecks.csproj
index ca701b76..95d2fcc0 100644
--- a/src/FunFair.BuildCheck.SolutionChecks/FunFair.BuildCheck.SolutionChecks.csproj
+++ b/src/FunFair.BuildCheck.SolutionChecks/FunFair.BuildCheck.SolutionChecks.csproj
@@ -26,7 +26,7 @@
     <OutputType>Library</OutputType>
     <RunAOTCompilation>false</RunAOTCompilation>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
-    <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     <TieredCompilation>true</TieredCompilation>
     <TieredPGO>true</TieredPGO>
     <TreatSpecificWarningsAsErrors />
diff --git a/src/FunFair.BuildCheck.Tests/FunFair.BuildCheck.Tests.csproj b/src/FunFair.BuildCheck.Tests/FunFair.BuildCheck.Tests.csproj
index 59175448..896ff1b7 100644
--- a/src/FunFair.BuildCheck.Tests/FunFair.BuildCheck.Tests.csproj
+++ b/src/FunFair.BuildCheck.Tests/FunFair.BuildCheck.Tests.csproj
@@ -24,7 +24,7 @@
     <OptimizationPreference>speed</OptimizationPreference>
     <OutputType>Library</OutputType>
     <RunAOTCompilation>false</RunAOTCompilation>
-    <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     <TieredCompilation>true</TieredCompilation>
     <TieredPGO>true</TieredPGO>
     <TreatSpecificWarningsAsErrors />
diff --git a/src/FunFair.BuildCheck/FunFair.BuildCheck.csproj b/src/FunFair.BuildCheck/FunFair.BuildCheck.csproj
index 9b4a4ff5..f430fb7f 100644
--- a/src/FunFair.BuildCheck/FunFair.BuildCheck.csproj
+++ b/src/FunFair.BuildCheck/FunFair.BuildCheck.csproj
@@ -29,7 +29,7 @@
     <RunAOTCompilation>false</RunAOTCompilation>
     <RuntimeIdentifiers>win-x64;win-arm64;osx-x64;osx-arm64;linux-x64;linux-arm64</RuntimeIdentifiers>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
-    <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     <TieredCompilation>true</TieredCompilation>
     <TieredPGO>true</TieredPGO>
     <ToolCommandName>buildcheck</ToolCommandName>