diff --git a/src/ReactiveUI.Validation.Tests/ReactiveUI.Validation.Tests.csproj b/src/ReactiveUI.Validation.Tests/ReactiveUI.Validation.Tests.csproj
index d4d95426..27553200 100644
--- a/src/ReactiveUI.Validation.Tests/ReactiveUI.Validation.Tests.csproj
+++ b/src/ReactiveUI.Validation.Tests/ReactiveUI.Validation.Tests.csproj
@@ -22,7 +22,7 @@
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-    <PackageReference Include="DiffEngine" Version="15.5.0" />
+    <PackageReference Include="DiffEngine" Version="15.5.1" />
     <PackageReference Include="JetBrains.DotMemoryUnit" Version="3.2.20220510" />
     <PackageReference Include="FluentAssertions" Version="6.12.1" />
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