diff --git a/solution/c#/Day14/Day14.Tests/LangExt/FizzBuzzTests.cs b/solution/c#/Day14/Day14.Tests/LangExt/FizzBuzzTests.cs
index b795c8824..7ee59399b 100644
--- a/solution/c#/Day14/Day14.Tests/LangExt/FizzBuzzTests.cs
+++ b/solution/c#/Day14/Day14.Tests/LangExt/FizzBuzzTests.cs
@@ -22,7 +22,7 @@ public void Returns_Number_Representation(int input, string expectedResult)
             => Day14.LangExt.FizzBuzz
                 .Convert(input)
                 .Should()
-                .BeSome(expectedResult);
+                .Be(expectedResult);
 
         [Theory]
         [InlineData(0)]
diff --git a/solution/c#/Day14/Day14/LangExt/FizzBuzz.cs b/solution/c#/Day14/Day14/LangExt/FizzBuzz.cs
index d04dee1ee..d6f4e3e4b 100644
--- a/solution/c#/Day14/Day14/LangExt/FizzBuzz.cs
+++ b/solution/c#/Day14/Day14/LangExt/FizzBuzz.cs
@@ -7,12 +7,13 @@ public static class FizzBuzz
         private const int Min = 1;
         private const int Max = 100;
 
-        private static readonly Map<int, string> Mapping =
-            Map.create(
-                (15, "FizzBuzz"),
-                (3, "Fizz"),
-                (5, "Buzz")
-            );
+        private static readonly Dictionary<int, string> Mapping =
+            new()
+            {
+                { 15, "FizzBuzz" },
+                { 3, "Fizz" },
+                { 5, "Buzz" }
+            };
 
         public static Option<string> Convert(int input)
             => IsOutOfRange(input)