diff --git a/TenorSharp.Tests/TenorSharp.Tests.csproj b/TenorSharp.Tests/TenorSharp.Tests.csproj
index 9c94845..57ed12f 100644
--- a/TenorSharp.Tests/TenorSharp.Tests.csproj
+++ b/TenorSharp.Tests/TenorSharp.Tests.csproj
@@ -13,7 +13,7 @@
         <PackageReference Include="FluentAssertions" Version="6.8.0"/>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0"/>
         <PackageReference Include="Moq" Version="4.18.3"/>
-        <PackageReference Include="NSubstitute" Version="4.4.0"/>
+        <PackageReference Include="NSubstitute" Version="5.0.0"/>
         <PackageReference Include="NSubstitute.Analyzers.CSharp" Version="1.0.15">
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>