diff --git a/test/UnitTests.Reqnroll/UnitTests.Reqnroll.csproj b/test/UnitTests.Reqnroll/UnitTests.Reqnroll.csproj
index f08f89f..202f1a1 100644
--- a/test/UnitTests.Reqnroll/UnitTests.Reqnroll.csproj
+++ b/test/UnitTests.Reqnroll/UnitTests.Reqnroll.csproj
@@ -31,7 +31,7 @@
         </PackageReference>
 
         <!-- required for .net framework xunit tests to run on mono via dotnet test: https://github.com/microsoft/vstest/issues/2469 -->
-        <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.0.0" />
+        <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.8.1" />
     </ItemGroup>
 
     <ItemGroup>
diff --git a/test/UnitTests.SingleThreaded.v3/UnitTests.SingleThreaded.v3.csproj b/test/UnitTests.SingleThreaded.v3/UnitTests.SingleThreaded.v3.csproj
index 937f8f1..12c2d5e 100644
--- a/test/UnitTests.SingleThreaded.v3/UnitTests.SingleThreaded.v3.csproj
+++ b/test/UnitTests.SingleThreaded.v3/UnitTests.SingleThreaded.v3.csproj
@@ -25,7 +25,7 @@
     </PackageReference>
 
     <!-- required for .net framework xunit tests to run on mono via dotnet test: https://github.com/microsoft/vstest/issues/2469 -->
-    <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.0.0" />
+    <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.8.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/test/UnitTests.SingleThreaded/UnitTests.SingleThreaded.csproj b/test/UnitTests.SingleThreaded/UnitTests.SingleThreaded.csproj
index 12f1e65..d51edf9 100644
--- a/test/UnitTests.SingleThreaded/UnitTests.SingleThreaded.csproj
+++ b/test/UnitTests.SingleThreaded/UnitTests.SingleThreaded.csproj
@@ -26,7 +26,7 @@
     </PackageReference>
 
     <!-- required for .net framework xunit tests to run on mono via dotnet test: https://github.com/microsoft/vstest/issues/2469 -->
-    <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.0.0" />
+    <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.8.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/test/UnitTests.SpecFlow/UnitTests.SpecFlow.csproj b/test/UnitTests.SpecFlow/UnitTests.SpecFlow.csproj
index 88c55e3..c980af3 100644
--- a/test/UnitTests.SpecFlow/UnitTests.SpecFlow.csproj
+++ b/test/UnitTests.SpecFlow/UnitTests.SpecFlow.csproj
@@ -32,7 +32,7 @@
         </PackageReference>
 
         <!-- required for .net framework xunit tests to run on mono via dotnet test: https://github.com/microsoft/vstest/issues/2469 -->
-        <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.0.0" />
+        <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.8.1" />
     </ItemGroup>
 
     <ItemGroup>
diff --git a/test/UnitTests.v3.Reqnroll/UnitTests.v3.Reqnroll.csproj b/test/UnitTests.v3.Reqnroll/UnitTests.v3.Reqnroll.csproj
index 93de9e9..35bae66 100644
--- a/test/UnitTests.v3.Reqnroll/UnitTests.v3.Reqnroll.csproj
+++ b/test/UnitTests.v3.Reqnroll/UnitTests.v3.Reqnroll.csproj
@@ -34,7 +34,7 @@
         </PackageReference>
 
         <!-- required for .net framework xunit tests to run on mono via dotnet test: https://github.com/microsoft/vstest/issues/2469 -->
-        <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.0.0"/>
+        <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.8.1"/>
     </ItemGroup>
 
     <ItemGroup>
diff --git a/test/UnitTests.v3/UnitTests.v3.csproj b/test/UnitTests.v3/UnitTests.v3.csproj
index 9ccf797..7267f1a 100644
--- a/test/UnitTests.v3/UnitTests.v3.csproj
+++ b/test/UnitTests.v3/UnitTests.v3.csproj
@@ -32,7 +32,7 @@
     </PackageReference>
     
     <!-- required for .net framework xunit tests to run on mono via dotnet test: https://github.com/microsoft/vstest/issues/2469 -->
-    <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.0.0" />
+    <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.8.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/test/UnitTests/UnitTests.csproj b/test/UnitTests/UnitTests.csproj
index 9abfea2..fb87fdf 100644
--- a/test/UnitTests/UnitTests.csproj
+++ b/test/UnitTests/UnitTests.csproj
@@ -32,7 +32,7 @@
     </PackageReference>
     
     <!-- required for .net framework xunit tests to run on mono via dotnet test: https://github.com/microsoft/vstest/issues/2469 -->
-    <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.0.0" />
+    <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="18.8.1" />
   </ItemGroup>
 
   <ItemGroup>