diff --git a/LightChain.UnitTests/LightChain.UnitTests.csproj b/LightChain.UnitTests/LightChain.UnitTests.csproj
index 7082f93..0866996 100644
--- a/LightChain.UnitTests/LightChain.UnitTests.csproj
+++ b/LightChain.UnitTests/LightChain.UnitTests.csproj
@@ -12,7 +12,7 @@
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="6.0.2" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
-    <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>