diff --git a/SimpleGPIO.Tests/SimpleGPIO.Tests.csproj b/SimpleGPIO.Tests/SimpleGPIO.Tests.csproj
index 727addf..435db0b 100644
--- a/SimpleGPIO.Tests/SimpleGPIO.Tests.csproj
+++ b/SimpleGPIO.Tests/SimpleGPIO.Tests.csproj
@@ -7,7 +7,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
-		<PackageReference Include="NSubstitute" Version="5.1.0" />
+		<PackageReference Include="NSubstitute" Version="5.3.0" />
 		<PackageReference Include="xunit" Version="2.9.2" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
 		<PackageReference Include="coverlet.collector" Version="6.0.2" />