diff --git a/MinecraftClient/Program.cs b/MinecraftClient/Program.cs
index 3c8e8336..63c60eb5 100644
--- a/MinecraftClient/Program.cs
+++ b/MinecraftClient/Program.cs
@@ -30,7 +30,7 @@ namespace MinecraftClient
 
         public const string Version = MCHighestVersion;
         public const string MCLowestVersion = "1.4.6";
-        public const string MCHighestVersion = "1.15.0";
+        public const string MCHighestVersion = "1.15.1";
         public static readonly string BuildInfo = null;
 
         private static Thread offlinePrompt = null;
diff --git a/MinecraftClient/Protocol/Handlers/Protocol18.cs b/MinecraftClient/Protocol/Handlers/Protocol18.cs
index 1c19dca7..9aeada68 100644
--- a/MinecraftClient/Protocol/Handlers/Protocol18.cs
+++ b/MinecraftClient/Protocol/Handlers/Protocol18.cs
@@ -30,12 +30,11 @@ namespace MinecraftClient.Protocol.Handlers
         internal const int MC110Version = 210;
         internal const int MC1112Version = 316;
         internal const int MC112Version = 335;
-        internal const int MC1121Version = 338;
         internal const int MC1122Version = 340;
         internal const int MC113Version = 393;
         internal const int MC114Version = 477;
-        internal const int MC1144Version = 498;
         internal const int MC115Version = 573;
+        internal const int MC1151Version = 575;
 
         private int compression_treshold = 0;
         private bool autocomplete_received = false;
@@ -63,7 +62,7 @@ namespace MinecraftClient.Protocol.Handlers
             this.pForge = new Protocol18Forge(forgeInfo, protocolVersion, dataTypes, this, handler);
             this.pTerrain = new Protocol18Terrain(protocolVersion, dataTypes, handler);
 
-            if (handler.GetTerrainEnabled() && protocolversion > MC115Version)
+            if (handler.GetTerrainEnabled() && protocolversion > MC1151Version)
             {
                 ConsoleIO.WriteLineFormatted("§8Terrain & Movements currently not handled for that MC version.");
                 handler.SetTerrainEnabled(false);
@@ -77,7 +76,7 @@ namespace MinecraftClient.Protocol.Handlers
 
             if (protocolversion >= MC113Version)
             {
-                if (protocolVersion > MC115Version && handler.GetTerrainEnabled())
+                if (protocolVersion > MC1151Version && handler.GetTerrainEnabled())
                     throw new NotImplementedException("Please update block types handling for this Minecraft version. See Material.cs");
                 if (protocolVersion >= MC115Version)
                     Block.Palette = new Palette115();