diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index ab0483da..8bbc8c51 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.507" PrivateAssets="all" />
+    <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.556" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/NUnitTestAdapter/NUnit.TestAdapter.csproj b/src/NUnitTestAdapter/NUnit.TestAdapter.csproj
index bd04ae78..dea712b8 100644
--- a/src/NUnitTestAdapter/NUnit.TestAdapter.csproj
+++ b/src/NUnitTestAdapter/NUnit.TestAdapter.csproj
@@ -33,12 +33,12 @@
 
   <ItemGroup>
     <PackageReference Include="SourceLink.Create.CommandLine" Version="2.8.3" PrivateAssets="All" />
-    <PackageReference Include="nunit.engine" Version="3.17.0" />
+    <PackageReference Include="nunit.engine" Version="3.18.1" />
     <PackageReference Include="TestCentric.Metadata" Version="3.0.2" Aliases="TestCentric" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net462'">
-    <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="11.0.0" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="15.0.0" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETCoreApp'">