diff --git a/src/Exercise-01-ConsoleApp/Calculator.Console.App/Calculator.App.csproj b/src/Exercise-01-ConsoleApp/Calculator.Console.App/Calculator.App.csproj
index ff789358..82aee85a 100644
--- a/src/Exercise-01-ConsoleApp/Calculator.Console.App/Calculator.App.csproj
+++ b/src/Exercise-01-ConsoleApp/Calculator.Console.App/Calculator.App.csproj
@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="CommandLineParser" Version="2.8.0" />
+    <PackageReference Include="CommandLineParser" Version="2.9.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Exercise-01-ConsoleApp/Calculator.Console.App/CalculatorWrapper.cs b/src/Exercise-01-ConsoleApp/Calculator.Console.App/CalculatorWrapper.cs
index 17a89c4c..ac074dd4 100644
--- a/src/Exercise-01-ConsoleApp/Calculator.Console.App/CalculatorWrapper.cs
+++ b/src/Exercise-01-ConsoleApp/Calculator.Console.App/CalculatorWrapper.cs
@@ -21,7 +21,7 @@ internal static void Calculate(CommandLineOptions options)
 
     private static int CheckOperand(int? operand)
     {
-        if (operand == null)
+        if (operand is null)
         {
             throw new ArgumentNullException(nameof(operand), "Operand cannot be null!");
         }
@@ -31,7 +31,7 @@ private static int CheckOperand(int? operand)
 
     private static MathOperation CheckOperation(MathOperation? operation)
     {
-        if (operation == null)
+        if (operation is null)
         {
             throw new ArgumentNullException(nameof(operation), "Operation cannot be null!");
         }
diff --git a/src/Exercise-01-ConsoleApp/Calculator.Utils.Tests/Calculator.Utils.Tests.csproj b/src/Exercise-01-ConsoleApp/Calculator.Utils.Tests/Calculator.Utils.Tests.csproj
index cf4da475..91636c72 100644
--- a/src/Exercise-01-ConsoleApp/Calculator.Utils.Tests/Calculator.Utils.Tests.csproj
+++ b/src/Exercise-01-ConsoleApp/Calculator.Utils.Tests/Calculator.Utils.Tests.csproj
@@ -8,13 +8,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
-    <PackageReference Include="xunit" Version="2.4.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-      <PrivateAssets>all</PrivateAssets>
-    </PackageReference>
-    <PackageReference Include="coverlet.collector" Version="1.3.0">
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
+    <PackageReference Include="xunit" Version="2.6.6" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>