diff --git a/AdventOfCode2026/AdventOfCode2026.csproj b/AdventOfCode2025/AdventOfCode2025.csproj
similarity index 82%
rename from AdventOfCode2026/AdventOfCode2026.csproj
rename to AdventOfCode2025/AdventOfCode2025.csproj
index 6c1dc92..28be7fa 100644
--- a/AdventOfCode2026/AdventOfCode2026.csproj
+++ b/AdventOfCode2025/AdventOfCode2025.csproj
@@ -5,6 +5,7 @@
         <TargetFramework>net10.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
+        <RootNamespace>AdventOfCode2025</RootNamespace>
     </PropertyGroup>
 
 </Project>
diff --git a/AdventOfCode2026/AdventOfCode2026.sln b/AdventOfCode2025/AdventOfCode2025.sln
similarity index 91%
rename from AdventOfCode2026/AdventOfCode2026.sln
rename to AdventOfCode2025/AdventOfCode2025.sln
index 9c1b5f3..ecf912e 100644
--- a/AdventOfCode2026/AdventOfCode2026.sln
+++ b/AdventOfCode2025/AdventOfCode2025.sln
@@ -1,6 +1,6 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AdventOfCode2026", "AdventOfCode2026.csproj", "{1B2A5F8D-587F-4257-9443-1951C8D0D38A}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AdventOfCode2025", "AdventOfCode2025.csproj", "{1B2A5F8D-587F-4257-9443-1951C8D0D38A}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
diff --git a/AdventOfCode2026/Day1.cs b/AdventOfCode2025/Day1.cs
similarity index 98%
rename from AdventOfCode2026/Day1.cs
rename to AdventOfCode2025/Day1.cs
index 7df5691..4a704db 100644
--- a/AdventOfCode2026/Day1.cs
+++ b/AdventOfCode2025/Day1.cs
@@ -1,4 +1,4 @@
-namespace AdventOfCode2026;
+namespace AdventOfCode2025;
 
 public sealed class Day1 : Solution
 {
diff --git a/AdventOfCode2026/Day2.cs b/AdventOfCode2025/Day2.cs
similarity index 98%
rename from AdventOfCode2026/Day2.cs
rename to AdventOfCode2025/Day2.cs
index babc9eb..70e2974 100644
--- a/AdventOfCode2026/Day2.cs
+++ b/AdventOfCode2025/Day2.cs
@@ -1,4 +1,4 @@
-namespace AdventOfCode2026;
+namespace AdventOfCode2025;
 
 public class Day2 : Solution
 {
diff --git a/AdventOfCode2026/InputReader.cs b/AdventOfCode2025/InputReader.cs
similarity index 89%
rename from AdventOfCode2026/InputReader.cs
rename to AdventOfCode2025/InputReader.cs
index faf4c04..36e8973 100644
--- a/AdventOfCode2026/InputReader.cs
+++ b/AdventOfCode2025/InputReader.cs
@@ -1,4 +1,4 @@
-namespace AdventOfCode2026;
+namespace AdventOfCode2025;
 
 public static class InputReader
 {
diff --git a/AdventOfCode2026/Inputs/Day1_0.txt b/AdventOfCode2025/Inputs/Day1_0.txt
similarity index 100%
rename from AdventOfCode2026/Inputs/Day1_0.txt
rename to AdventOfCode2025/Inputs/Day1_0.txt
diff --git a/AdventOfCode2026/Inputs/Day1_1.txt b/AdventOfCode2025/Inputs/Day1_1.txt
similarity index 100%
rename from AdventOfCode2026/Inputs/Day1_1.txt
rename to AdventOfCode2025/Inputs/Day1_1.txt
diff --git a/AdventOfCode2026/Inputs/Day2_0.txt b/AdventOfCode2025/Inputs/Day2_0.txt
similarity index 100%
rename from AdventOfCode2026/Inputs/Day2_0.txt
rename to AdventOfCode2025/Inputs/Day2_0.txt
diff --git a/AdventOfCode2026/Inputs/Day2_1.txt b/AdventOfCode2025/Inputs/Day2_1.txt
similarity index 100%
rename from AdventOfCode2026/Inputs/Day2_1.txt
rename to AdventOfCode2025/Inputs/Day2_1.txt
diff --git a/AdventOfCode2026/Program.cs b/AdventOfCode2025/Program.cs
similarity index 94%
rename from AdventOfCode2026/Program.cs
rename to AdventOfCode2025/Program.cs
index c105c0d..ad63bdc 100644
--- a/AdventOfCode2026/Program.cs
+++ b/AdventOfCode2025/Program.cs
@@ -1,4 +1,4 @@
-namespace AdventOfCode2026;
+namespace AdventOfCode2025;
 
 internal class Program
 {
@@ -19,7 +19,7 @@ internal class Program
     {
         var solutionText = $"Solution for Day {day.ToString().PadLeft(2, '0')}:";
         var className = $"Day{day}";
-        var classType = Type.GetType($"AdventOfCode2026.{className}");
+        var classType = Type.GetType($"AdventOfCode2025.{className}");
         if (classType == null)
         {
             Console.WriteLine($"{solutionText} is not implemented.");
diff --git a/AdventOfCode2026/Solution.cs b/AdventOfCode2025/Solution.cs
similarity index 85%
rename from AdventOfCode2026/Solution.cs
rename to AdventOfCode2025/Solution.cs
index bf95ae0..0929284 100644
--- a/AdventOfCode2026/Solution.cs
+++ b/AdventOfCode2025/Solution.cs
@@ -1,4 +1,4 @@
-namespace AdventOfCode2026;
+namespace AdventOfCode2025;
 
 public abstract class Solution
 {