diff --git a/Directory.Build.props b/Directory.Build.props
index c1ecd78..8ca024d 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -11,7 +11,19 @@
   </PropertyGroup>
 
   <!--
-    Package metadata that is identical across the shipping packages. Everything that
+    Verify 33 fails the build unless the consumer answers its maintenance-fee check. MarkupString is
+    open source and earns nothing, which is Verify's own OpenSource exemption. The exemption is
+    time-bounded, at most twelve months out, so this date has to be moved forward (or the answer
+    changed) before it passes — the build says so when it lapses. Verify's terms:
+    https://github.com/VerifyTests/Verify/blob/main/docs/maintenance-fee.md
+  -->
+  <PropertyGroup>
+    <Verify_SponsorshipExemption>OpenSource</Verify_SponsorshipExemption>
+    <Verify_SponsorshipExemptionUntil>2027-09</Verify_SponsorshipExemptionUntil>
+  </PropertyGroup>
+
+  <!--
+    Package metadata that is identical across the three shipping packages. Everything that
     differs per package — PackageId, AssemblyName, Description, project references — stays in
     the project file. Test and smoke projects set IsPackable=false, so these are inert there.
   -->
diff --git a/MarkupString.Tests/MarkupString.Tests.csproj b/MarkupString.Tests/MarkupString.Tests.csproj
index 5652398..c44bf2a 100644
--- a/MarkupString.Tests/MarkupString.Tests.csproj
+++ b/MarkupString.Tests/MarkupString.Tests.csproj
@@ -8,12 +8,12 @@
     <NoWarn>TUnit0038;TUnitAssertions0002</NoWarn>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="CsCheck" Version="4.8.0" />
-    <PackageReference Include="TUnit" Version="1.66.27" />
+    <PackageReference Include="CsCheck" Version="4.9.1" />
+    <PackageReference Include="TUnit" Version="1.68.17" />
     <!-- Verify.TUnit carries a floor on TUnit.Core. Bump the two together: if NuGet lifts
          TUnit.Core past the TUnit.Engine this project asks for, the split versions fault at
          startup with MissingFieldException rather than failing to restore. -->
-    <PackageReference Include="Verify.TUnit" Version="32.0.0" />
+    <PackageReference Include="Verify.TUnit" Version="33.1.1" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\MarkupString\MarkupString.csproj" />