diff --git a/src/Updater.cs b/src/Updater.cs
index 47fb45d..1f12166 100644
--- a/src/Updater.cs
+++ b/src/Updater.cs
@@ -245,6 +245,8 @@ public async Task RunUpdates(string? id = null)
                 _writeMessage("Checking Core: " + name);
                 var mostRecentRelease = core.version;
 
+                await core.ReplaceCheck();
+
                 if(mostRecentRelease == null) {
                     _writeMessage("No releases found. Skipping");
                     await CopyBetaKey(core);
diff --git a/src/models/Core.cs b/src/models/Core.cs
index 3fdad85..e1f2ca0 100644
--- a/src/models/Core.cs
+++ b/src/models/Core.cs
@@ -14,8 +14,9 @@ public class Core : Base
     public string platform_id { get; set; }
     public Sponsor? sponsor { get; set; }
     public string? download_url { get; set; }
-    public string? date_release { get; set; }
+    public string? release_date { get; set; }
     public string? version { get; set; }
+    public string[]? replaces { get; set; }
     public string? betaSlotId = null;
 
     public bool requires_license { get; set; } = false;
@@ -292,6 +293,28 @@ public async Task<Dictionary<string, Object>> DownloadAssets()
         return config;
     }
 
+    public Updater.Substitute[]? getSubstitutes()
+    {
+        checkUpdateDirectory();
+        string file = Path.Combine(Factory.GetGlobals().UpdateDirectory, "Cores", this.identifier, "updaters.json");
+        if (!File.Exists(file))
+        {
+            return null;
+        }
+        string json = File.ReadAllText(file);
+        var options = new JsonSerializerOptions()
+        {
+            AllowTrailingCommas = true
+        };
+        Updater.Updaters? config = JsonSerializer.Deserialize<Updater.Updaters>(json, options);
+
+        if (config == null) {
+            return null;
+        }
+
+        return config.previous;
+    }
+
     public bool isInstalled()
     {
         checkUpdateDirectory();
@@ -504,6 +527,19 @@ public bool JTBetaCheck()
 
         return check;
     }
+
+    public async Task ReplaceCheck()
+    {
+        if (replaces != null) {
+            foreach(string id in replaces) {
+                Core c = new Core(){identifier = id};
+                if (c.isInstalled()) {
+                    c.Uninstall();
+                    _writeMessage($"Uninstalled {id}. It was replaced by this core.");
+                }
+            }
+        }
+    }
 }
 
 public class myReverserClass : IComparer  {
diff --git a/src/models/Updater/Substitute.cs b/src/models/Updater/Substitute.cs
new file mode 100644
index 0000000..130fb19
--- /dev/null
+++ b/src/models/Updater/Substitute.cs
@@ -0,0 +1,8 @@
+namespace pannella.analoguepocket.Updater;
+
+public class Substitute
+{
+    public string? platform{ get; set; }
+    public string? author { get; set; }
+    public string? shortname { get; set; }
+}
\ No newline at end of file
diff --git a/src/models/Updater/Updaters.cs b/src/models/Updater/Updaters.cs
new file mode 100644
index 0000000..42007f8
--- /dev/null
+++ b/src/models/Updater/Updaters.cs
@@ -0,0 +1,6 @@
+namespace pannella.analoguepocket.Updater;
+
+public class Updaters
+{
+    public Substitute[]? previous;
+}
\ No newline at end of file