diff --git a/EchoTcpServerTests/EchoTcpServerTests.csproj b/EchoTcpServerTests/EchoTcpServerTests.csproj
index cc755d9..b53cf9e 100644
--- a/EchoTcpServerTests/EchoTcpServerTests.csproj
+++ b/EchoTcpServerTests/EchoTcpServerTests.csproj
@@ -23,7 +23,7 @@
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
         <PackageReference Include="Moq" Version="4.20.72" />
         <PackageReference Include="NetArchTest.Rules" Version="1.3.2" />
-        <PackageReference Include="NUnit" Version="3.14.0" />
+        <PackageReference Include="NUnit" Version="4.5.1" />
         <PackageReference Include="NUnit.Analyzers" Version="3.9.0" />
         <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
     </ItemGroup>
diff --git a/NetSdrClientAppTests/NetSdrClientAppTests.csproj b/NetSdrClientAppTests/NetSdrClientAppTests.csproj
index 470d4fa..07deaff 100644
--- a/NetSdrClientAppTests/NetSdrClientAppTests.csproj
+++ b/NetSdrClientAppTests/NetSdrClientAppTests.csproj
@@ -19,7 +19,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="Moq" Version="4.20.72" />
     <PackageReference Include="NetArchTest.Rules" Version="1.3.2" />
-    <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit" Version="4.5.1" />
     <PackageReference Include="NUnit.Analyzers" Version="3.9.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
   </ItemGroup>