diff --git a/src/SMAPI.Mods.ErrorHandler/ModEntry.cs b/src/SMAPI.Mods.ErrorHandler/ModEntry.cs
index 22e68421..25056b5e 100644
--- a/src/SMAPI.Mods.ErrorHandler/ModEntry.cs
+++ b/src/SMAPI.Mods.ErrorHandler/ModEntry.cs
@@ -2,7 +2,9 @@ using System;
 using System.Reflection;
 using StardewModdingAPI.Events;
 using StardewModdingAPI.Internal.Patching;
+#if SMAPI_DEPRECATED
 using StardewModdingAPI.Mods.ErrorHandler.ModPatches;
+#endif
 using StardewModdingAPI.Mods.ErrorHandler.Patches;
 using StardewValley;
 
@@ -39,10 +41,12 @@ namespace StardewModdingAPI.Mods.ErrorHandler
                 new ObjectPatcher(),
                 new SaveGamePatcher(this.Monitor, this.OnSaveContentRemoved),
                 new SpriteBatchPatcher(),
-                new UtilityPatcher(),
+                new UtilityPatcher()
 
+#if SMAPI_DEPRECATED
                 // mod patches
-                new PyTkPatcher(helper.ModRegistry)
+                , new PyTkPatcher(helper.ModRegistry)
+#endif
             );
 
             // hook events
diff --git a/src/SMAPI.Mods.ErrorHandler/ModPatches/PyTkPatcher.cs b/src/SMAPI.Mods.ErrorHandler/ModPatches/PyTkPatcher.cs
index 83cd42b9..f084902a 100644
--- a/src/SMAPI.Mods.ErrorHandler/ModPatches/PyTkPatcher.cs
+++ b/src/SMAPI.Mods.ErrorHandler/ModPatches/PyTkPatcher.cs
@@ -1,3 +1,4 @@
+#if SMAPI_DEPRECATED
 using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Reflection;
@@ -77,3 +78,4 @@ namespace StardewModdingAPI.Mods.ErrorHandler.ModPatches
         }
     }
 }
+#endif
diff --git a/src/SMAPI/Framework/ContentManagers/ModContentManager.cs b/src/SMAPI/Framework/ContentManagers/ModContentManager.cs
index 6a36ab48..cc6f8372 100644
--- a/src/SMAPI/Framework/ContentManagers/ModContentManager.cs
+++ b/src/SMAPI/Framework/ContentManagers/ModContentManager.cs
@@ -50,8 +50,10 @@ namespace StardewModdingAPI.Framework.ContentManagers
         /*********
         ** Accessors
         *********/
+#if SMAPI_DEPRECATED
         /// <summary>Whether to enable legacy compatibility mode for PyTK scale-up textures.</summary>
         internal static bool EnablePyTkLegacyMode;
+#endif
 
 
         /*********
@@ -202,6 +204,7 @@ namespace StardewModdingAPI.Framework.ContentManagers
             bool expectsRawData = typeof(T).IsAssignableTo(typeof(IRawTextureData));
             bool asRawData = expectsRawData || this.UseRawImageLoading;
 
+#if SMAPI_DEPRECATED
             // disable raw data if PyTK will rescale the image (until it supports raw data)
             if (asRawData && !expectsRawData)
             {
@@ -212,9 +215,10 @@ namespace StardewModdingAPI.Framework.ContentManagers
                     // current file has a '.pytk.json' rescale file though, since PyTK may still
                     // rescale it if the original asset or another edit gets rescaled.
                     asRawData = false;
-                    this.Monitor.LogOnce("Enabled compatibility mode for PyTK 1.23.* or earlier. This won't cause any issues, but may impact performance.", LogLevel.Warn);
+                    this.Monitor.LogOnce("Enabled compatibility mode for PyTK 1.23.* or earlier. This won't cause any issues, but may impact performance. This will no longer be supported in the upcoming SMAPI 4.0.0.", LogLevel.Warn);
                 }
             }
+#endif
 
             // load
             if (asRawData)
diff --git a/src/SMAPI/Framework/SCore.cs b/src/SMAPI/Framework/SCore.cs
index a5e51bdf..16ff2537 100644
--- a/src/SMAPI/Framework/SCore.cs
+++ b/src/SMAPI/Framework/SCore.cs
@@ -1672,6 +1672,7 @@ namespace StardewModdingAPI.Framework
             // initialize translations
             this.ReloadTranslations(loaded);
 
+#if SMAPI_DEPRECATED
             // set temporary PyTK compatibility mode
             // This is part of a three-part fix for PyTK 1.23.* and earlier. When removing this,
             // search 'Platonymous.Toolkit' to find the other part in SMAPI and Content Patcher.
@@ -1679,6 +1680,7 @@ namespace StardewModdingAPI.Framework
                 IModInfo? pyTk = this.ModRegistry.Get("Platonymous.Toolkit");
                 ModContentManager.EnablePyTkLegacyMode = pyTk is not null && pyTk.Manifest.Version.IsOlderThan("1.24.0");
             }
+#endif
 
             // initialize loaded non-content-pack mods
             this.Monitor.Log("Launching mods...", LogLevel.Debug);