diff --git a/NHSISL.LibPostalClient.Tests.Acceptance/NHSISL.LibPostalClient.Tests.Acceptance.csproj b/NHSISL.LibPostalClient.Tests.Acceptance/NHSISL.LibPostalClient.Tests.Acceptance.csproj
index 4fd7ac8..1042116 100644
--- a/NHSISL.LibPostalClient.Tests.Acceptance/NHSISL.LibPostalClient.Tests.Acceptance.csproj
+++ b/NHSISL.LibPostalClient.Tests.Acceptance/NHSISL.LibPostalClient.Tests.Acceptance.csproj
@@ -23,7 +23,7 @@
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 		<PackageReference Include="Tynamix.ObjectFiller" Version="1.5.9" />
-		<PackageReference Include="xunit.v3" Version="3.2.2" />
+		<PackageReference Include="xunit.v3" Version="4.0.0" />
 		<PackageReference Include="xunit.analyzers" Version="1.27.0">
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diff --git a/NHSISL.LibPostalClient.Tests.Unit/NHSISL.LibPostalClient.Tests.Unit.csproj b/NHSISL.LibPostalClient.Tests.Unit/NHSISL.LibPostalClient.Tests.Unit.csproj
index 340f5c3..45ddab8 100644
--- a/NHSISL.LibPostalClient.Tests.Unit/NHSISL.LibPostalClient.Tests.Unit.csproj
+++ b/NHSISL.LibPostalClient.Tests.Unit/NHSISL.LibPostalClient.Tests.Unit.csproj
@@ -18,7 +18,7 @@
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-		<PackageReference Include="xunit.v3" Version="3.2.2" />
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