diff --git a/grate.unittests/grate.unittests.csproj b/grate.unittests/grate.unittests.csproj
index 344152fd..539053cd 100644
--- a/grate.unittests/grate.unittests.csproj
+++ b/grate.unittests/grate.unittests.csproj
@@ -16,7 +16,7 @@
     </PackageReference>
     <PackageReference Include="Microsoft.Data.SqlClient" Version="5.1.*" />
     <PackageReference Include="FluentAssertions" Version="6.12.*" />
-    <PackageReference Include="NSubstitute" Version="5.0.*" />
+    <PackageReference Include="NSubstitute" Version="5.1.*" />
     <PackageReference Include="Dapper" Version="2.0.*" />
     <PackageReference Include="Oracle.ManagedDataAccess.Core" Version="3.21.*" />
     <PackageReference Include="Npgsql" Version="7.0.*" />