diff --git a/Testing/CarbonateTests/CarbonateTests.csproj b/Testing/CarbonateTests/CarbonateTests.csproj
index b4685a4..cfcb48b 100644
--- a/Testing/CarbonateTests/CarbonateTests.csproj
+++ b/Testing/CarbonateTests/CarbonateTests.csproj
@@ -22,7 +22,7 @@
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         </PackageReference>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
-        <PackageReference Include="NSubstitute" Version="5.1.0" />
+        <PackageReference Include="NSubstitute" Version="5.3.0" />
         <PackageReference Include="NSubstitute.Analyzers.CSharp" Version="1.0.17">
           <PrivateAssets>all</PrivateAssets>
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>