diff --git a/TomLonghurst.ReadableTimeSpan.Newtonsoft.Json.UnitTests/TomLonghurst.ReadableTimeSpan.Newtonsoft.Json.UnitTests.csproj b/TomLonghurst.ReadableTimeSpan.Newtonsoft.Json.UnitTests/TomLonghurst.ReadableTimeSpan.Newtonsoft.Json.UnitTests.csproj
index 05d0717..c191bde 100644
--- a/TomLonghurst.ReadableTimeSpan.Newtonsoft.Json.UnitTests/TomLonghurst.ReadableTimeSpan.Newtonsoft.Json.UnitTests.csproj
+++ b/TomLonghurst.ReadableTimeSpan.Newtonsoft.Json.UnitTests/TomLonghurst.ReadableTimeSpan.Newtonsoft.Json.UnitTests.csproj
@@ -9,7 +9,7 @@
 
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
-        <PackageReference Include="NUnit" Version="4.5.1" />
+        <PackageReference Include="NUnit" Version="4.6.0" />
         <PackageReference Include="NUnit3TestAdapter" Version="6.2.0" />
         <PackageReference Include="coverlet.collector" Version="10.0.0" />
     </ItemGroup>
diff --git a/TomLonghurst.ReadableTimeSpan.System.Text.Json.UnitTests/TomLonghurst.ReadableTimeSpan.System.Text.Json.UnitTests.csproj b/TomLonghurst.ReadableTimeSpan.System.Text.Json.UnitTests/TomLonghurst.ReadableTimeSpan.System.Text.Json.UnitTests.csproj
index 2843940..31b5f5a 100644
--- a/TomLonghurst.ReadableTimeSpan.System.Text.Json.UnitTests/TomLonghurst.ReadableTimeSpan.System.Text.Json.UnitTests.csproj
+++ b/TomLonghurst.ReadableTimeSpan.System.Text.Json.UnitTests/TomLonghurst.ReadableTimeSpan.System.Text.Json.UnitTests.csproj
@@ -9,7 +9,7 @@
 
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
-        <PackageReference Include="NUnit" Version="4.5.1" />
+        <PackageReference Include="NUnit" Version="4.6.0" />
         <PackageReference Include="NUnit3TestAdapter" Version="6.2.0" />
         <PackageReference Include="coverlet.collector" Version="10.0.0" />
     </ItemGroup>
diff --git a/TomLonghurst.ReadableTimeSpan.UnitTests/TomLonghurst.ReadableTimeSpan.UnitTests.csproj b/TomLonghurst.ReadableTimeSpan.UnitTests/TomLonghurst.ReadableTimeSpan.UnitTests.csproj
index dae822d..97f5cba 100644
--- a/TomLonghurst.ReadableTimeSpan.UnitTests/TomLonghurst.ReadableTimeSpan.UnitTests.csproj
+++ b/TomLonghurst.ReadableTimeSpan.UnitTests/TomLonghurst.ReadableTimeSpan.UnitTests.csproj
@@ -12,7 +12,7 @@
         <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="10.0.7" />
         <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="10.0.7" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
-        <PackageReference Include="NUnit" Version="4.5.1" />
+        <PackageReference Include="NUnit" Version="4.6.0" />
         <PackageReference Include="NUnit3TestAdapter" Version="6.2.0" />
         <PackageReference Include="coverlet.collector" Version="10.0.0" />
     </ItemGroup>