diff --git a/src/Trakx.Coinbase.Custody.ApiClient.Tests/Trakx.Coinbase.Custody.ApiClient.Tests.csproj b/src/Trakx.Coinbase.Custody.ApiClient.Tests/Trakx.Coinbase.Custody.ApiClient.Tests.csproj
index b16b449..94d4538 100644
--- a/src/Trakx.Coinbase.Custody.ApiClient.Tests/Trakx.Coinbase.Custody.ApiClient.Tests.csproj
+++ b/src/Trakx.Coinbase.Custody.ApiClient.Tests/Trakx.Coinbase.Custody.ApiClient.Tests.csproj
@@ -20,7 +20,7 @@
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-    <PackageReference Include="NSubstitute" Version="4.4.0" />
+    <PackageReference Include="NSubstitute" Version="5.0.0" />
     <PackageReference Include="Serilog.Sinks.XUnit" Version="3.0.5" />
     <PackageReference Include="System.Linq.Async" Version="6.0.1" />
     <PackageReference Include="xunit" Version="2.4.2" />