diff --git a/samples/Basic/FunctionalStateMachine.Samples/FunctionalStateMachine.Samples.csproj b/samples/Basic/FunctionalStateMachine.Samples/FunctionalStateMachine.Samples.csproj
index 8b9cc93..6e06b77 100644
--- a/samples/Basic/FunctionalStateMachine.Samples/FunctionalStateMachine.Samples.csproj
+++ b/samples/Basic/FunctionalStateMachine.Samples/FunctionalStateMachine.Samples.csproj
@@ -10,7 +10,7 @@
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+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0"/>
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diff --git a/samples/StockPurchaser/StockPurchaserSampleApp.Tests/StockPurchaserSampleApp.Tests.csproj b/samples/StockPurchaser/StockPurchaserSampleApp.Tests/StockPurchaserSampleApp.Tests.csproj
index 1521807..1fbf859 100644
--- a/samples/StockPurchaser/StockPurchaserSampleApp.Tests/StockPurchaserSampleApp.Tests.csproj
+++ b/samples/StockPurchaser/StockPurchaserSampleApp.Tests/StockPurchaserSampleApp.Tests.csproj
@@ -10,7 +10,7 @@
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     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
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diff --git a/samples/VendingMachine/VendingMachineSampleApp.Tests/VendingMachineSampleApp.Tests.csproj b/samples/VendingMachine/VendingMachineSampleApp.Tests/VendingMachineSampleApp.Tests.csproj
index 85829d2..e2ab2f9 100644
--- a/samples/VendingMachine/VendingMachineSampleApp.Tests/VendingMachineSampleApp.Tests.csproj
+++ b/samples/VendingMachine/VendingMachineSampleApp.Tests/VendingMachineSampleApp.Tests.csproj
@@ -10,7 +10,7 @@
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     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
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diff --git a/test/FunctionalStateMachine.CommandRunnerTests/FunctionalStateMachine.CommandRunnerTests.csproj b/test/FunctionalStateMachine.CommandRunnerTests/FunctionalStateMachine.CommandRunnerTests.csproj
index 25aec13..2e5bf58 100644
--- a/test/FunctionalStateMachine.CommandRunnerTests/FunctionalStateMachine.CommandRunnerTests.csproj
+++ b/test/FunctionalStateMachine.CommandRunnerTests/FunctionalStateMachine.CommandRunnerTests.csproj
@@ -11,7 +11,7 @@
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diff --git a/test/FunctionalStateMachine.Core.Tests/FunctionalStateMachine.Core.Tests.csproj b/test/FunctionalStateMachine.Core.Tests/FunctionalStateMachine.Core.Tests.csproj
index c042c89..b6bf90f 100644
--- a/test/FunctionalStateMachine.Core.Tests/FunctionalStateMachine.Core.Tests.csproj
+++ b/test/FunctionalStateMachine.Core.Tests/FunctionalStateMachine.Core.Tests.csproj
@@ -10,7 +10,7 @@
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diff --git a/test/FunctionalStateMachine.Diagrams.Tests/FunctionalStateMachine.Diagrams.Tests.csproj b/test/FunctionalStateMachine.Diagrams.Tests/FunctionalStateMachine.Diagrams.Tests.csproj
index f93ca38..35fb387 100644
--- a/test/FunctionalStateMachine.Diagrams.Tests/FunctionalStateMachine.Diagrams.Tests.csproj
+++ b/test/FunctionalStateMachine.Diagrams.Tests/FunctionalStateMachine.Diagrams.Tests.csproj
@@ -8,7 +8,7 @@
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