diff --git a/src/GuiException/tests/nunit.uiexception.tests.csproj b/src/GuiException/tests/nunit.uiexception.tests.csproj
index 3aad9687..8f3d1211 100644
--- a/src/GuiException/tests/nunit.uiexception.tests.csproj
+++ b/src/GuiException/tests/nunit.uiexception.tests.csproj
@@ -25,7 +25,7 @@
     </ItemGroup>
     
 	<ItemGroup>
-        <PackageReference Include="NSubstitute" Version="5.1.0" />
+        <PackageReference Include="NSubstitute" Version="5.3.0" />
 	    <PackageReference Include="NUnit" Version="4.1.0" />
 	    <PackageReference Include="NUnitLite" Version="4.1.0" />
 	    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
diff --git a/src/TestCentric/tests/TestCentric.Gui.Tests.csproj b/src/TestCentric/tests/TestCentric.Gui.Tests.csproj
index 50370821..6c89430c 100644
--- a/src/TestCentric/tests/TestCentric.Gui.Tests.csproj
+++ b/src/TestCentric/tests/TestCentric.Gui.Tests.csproj
@@ -29,7 +29,7 @@
     </ItemGroup>
     
 	<ItemGroup>
-        <PackageReference Include="NSubstitute" Version="5.1.0" />
+        <PackageReference Include="NSubstitute" Version="5.3.0" />
 		<PackageReference Include="NUnit" Version="4.1.0" />
 		<PackageReference Include="NUnitLite" Version="4.1.0" />
 		<PackageReference Include="NUnit.Extension.NUnitProjectLoader" Version="3.6.0" />
diff --git a/src/TestModel/tests/TestCentric.Gui.Model.Tests.csproj b/src/TestModel/tests/TestCentric.Gui.Model.Tests.csproj
index 1e737272..d2211b1f 100644
--- a/src/TestModel/tests/TestCentric.Gui.Model.Tests.csproj
+++ b/src/TestModel/tests/TestCentric.Gui.Model.Tests.csproj
@@ -20,7 +20,7 @@
     </ItemGroup>
     
 	<ItemGroup>
-        <PackageReference Include="NSubstitute" Version="5.1.0" />
+        <PackageReference Include="NSubstitute" Version="5.3.0" />
 		<PackageReference Include="NUnit" Version="4.1.0" />
 		<PackageReference Include="NUnitLite" Version="4.1.0" />
 		<PackageReference Include="TestCentric.Engine.Api" Version="2.0.0-beta6" />