diff --git a/NOnion.Tests/NOnion.Tests.csproj b/NOnion.Tests/NOnion.Tests.csproj
index 2e65753e..934851eb 100644
--- a/NOnion.Tests/NOnion.Tests.csproj
+++ b/NOnion.Tests/NOnion.Tests.csproj
@@ -7,9 +7,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="NUnit" Version="3.13.3" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
+    <PackageReference Include="NUnit" Version="3.12.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="3.16.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
     <PackageReference Include="Portable.BouncyCastle" Version="1.8.10" />
   </ItemGroup>