diff --git a/mama/dotnet/src/nunittest/mamadotnetunittests.csproj b/mama/dotnet/src/nunittest/mamadotnetunittests.csproj
index e7e60b07..9f838fd9 100644
--- a/mama/dotnet/src/nunittest/mamadotnetunittests.csproj
+++ b/mama/dotnet/src/nunittest/mamadotnetunittests.csproj
@@ -14,7 +14,7 @@
     </PropertyGroup>
     <ItemGroup>
         <PackageReference Include="NUnitLite" Version="3.14.0" />
-        <PackageReference Include="nunit" Version="3.14.0" />
+        <PackageReference Include="nunit" Version="4.0.0" />
         <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     </ItemGroup>
diff --git a/mamda/dotnet/src/NUnittest/mamdadotnetunittests.csproj b/mamda/dotnet/src/NUnittest/mamdadotnetunittests.csproj
index 34f59183..ef0c42c2 100644
--- a/mamda/dotnet/src/NUnittest/mamdadotnetunittests.csproj
+++ b/mamda/dotnet/src/NUnittest/mamdadotnetunittests.csproj
@@ -11,7 +11,7 @@
         <Company>OpenMAMA.org</Company>
     </PropertyGroup>
     <ItemGroup>
-        <PackageReference Include="nunit" Version="3.14.0" />
+        <PackageReference Include="nunit" Version="4.0.0" />
         <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     </ItemGroup>