diff --git a/test/IXMPTestApp/MSTest/IXMPTestApp.csproj b/test/IXMPTestApp/MSTest/IXMPTestApp.csproj
index b1a1e3f886..8b2c99603a 100644
--- a/test/IXMPTestApp/MSTest/IXMPTestApp.csproj
+++ b/test/IXMPTestApp/MSTest/IXMPTestApp.csproj
@@ -25,6 +25,7 @@
       <Version>2.1.2</Version>
     </PackageReference>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
   </ItemGroup>
   <ItemGroup>
     <SDKReference Include="TestPlatform.Universal, Version=$(UnitTestPlatformVersion)" />
diff --git a/test/IXMPTestApp/TAEF/project.json b/test/IXMPTestApp/TAEF/project.json
index a29b77d94e..ad40b9b6af 100644
--- a/test/IXMPTestApp/TAEF/project.json
+++ b/test/IXMPTestApp/TAEF/project.json
@@ -3,7 +3,8 @@
     "Microsoft.Net.Native.Compiler": "2.2.3",
     "Microsoft.NETCore.UniversalWindowsPlatform": "6.2.8",
     "MUXCustomBuildTasks": "1.0.74",
-    "TAEF.Redist.Wlk": "10.31.180822002"
+    "TAEF.Redist.Wlk": "10.31.180822002",
+    "Newtonsoft.Json": "13.0.1"
   },
   "frameworks": {
     "uap10.0.17763": {}
diff --git a/test/MUXControls.Test/TAEF/MUXControls.Test.TAEF.csproj b/test/MUXControls.Test/TAEF/MUXControls.Test.TAEF.csproj
index b32145ab8f..6434489bff 100644
--- a/test/MUXControls.Test/TAEF/MUXControls.Test.TAEF.csproj
+++ b/test/MUXControls.Test/TAEF/MUXControls.Test.TAEF.csproj
@@ -38,6 +38,7 @@
     <PackageReference Include="Microsoft.Win32.Registry" Version="4.7.0" />
     <PackageReference Include="Microsoft.Windows.Apps.Test" Version="1.0.181205002" />
     <PackageReference Include="TAEF.Redist.Wlk" Version="10.31.180822002" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
   </ItemGroup>
   <Import Project="..\MUXControls.Test.Shared.projitems" />
   <ItemGroup>
diff --git a/test/MUXControlsTestApp/MSTest/MUXControlsTestApp.csproj b/test/MUXControlsTestApp/MSTest/MUXControlsTestApp.csproj
index f90a6a5bc3..27c4e2625b 100644
--- a/test/MUXControlsTestApp/MSTest/MUXControlsTestApp.csproj
+++ b/test/MUXControlsTestApp/MSTest/MUXControlsTestApp.csproj
@@ -34,6 +34,7 @@
       <Version>2.1.2</Version>
     </PackageReference>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
   </ItemGroup>
   <ItemGroup>
     <SDKReference Include="TestPlatform.Universal, Version=$(UnitTestPlatformVersion)" />
diff --git a/test/MUXControlsTestApp/TAEF/project.json b/test/MUXControlsTestApp/TAEF/project.json
index 50f7e13fce..bbbb822a76 100644
--- a/test/MUXControlsTestApp/TAEF/project.json
+++ b/test/MUXControlsTestApp/TAEF/project.json
@@ -6,7 +6,8 @@
     "Microsoft.Web.WebView2": "1.0.1264.42",
     "MUXCustomBuildTasks": "1.0.74",
     "TAEF.Redist.Wlk": "10.31.180822002",
-    "Win2D.uwp": "1.22.0"
+    "Win2D.uwp": "1.22.0",
+    "Newtonsoft.Json": "13.0.1"
   },
   "frameworks": {
     "uap10.0.17763": {}