diff --git a/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs b/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs
index f71da4999..cb2b01fad 100644
--- a/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs
+++ b/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs
@@ -15,7 +15,6 @@ public static void AddDefineSymbols()
             HashSet<string> defines = new HashSet<string>(currentDefines.Split(';'))
             {
                 "MIRROR",
-                "MIRROR_55_0_OR_NEWER",
                 "MIRROR_57_0_OR_NEWER",
                 "MIRROR_58_0_OR_NEWER",
                 "MIRROR_65_0_OR_NEWER",
@@ -23,7 +22,8 @@ public static void AddDefineSymbols()
                 "MIRROR_2022_9_OR_NEWER",
                 "MIRROR_2022_10_OR_NEWER",
                 "MIRROR_70_0_OR_NEWER",
-                "MIRROR_71_0_OR_NEWER"
+                "MIRROR_71_0_OR_NEWER",
+                "MIRROR_73_OR_NEWER"
                 // Remove oldest when adding next month's symbol.
                 // Keep a rolling 12 months of symbols.
             };
diff --git a/ProjectSettings/ProjectSettings.asset b/ProjectSettings/ProjectSettings.asset
index 1a6510577..fe5313fde 100644
--- a/ProjectSettings/ProjectSettings.asset
+++ b/ProjectSettings/ProjectSettings.asset
@@ -579,9 +579,9 @@ PlayerSettings:
   webGLDecompressionFallback: 0
   webGLPowerPreference: 2
   scriptingDefineSymbols:
-    Server: MIRROR;MIRROR_55_0_OR_NEWER;MIRROR_57_0_OR_NEWER;MIRROR_58_0_OR_NEWER;MIRROR_65_0_OR_NEWER;MIRROR_66_0_OR_NEWER;MIRROR_2022_9_OR_NEWER;MIRROR_2022_10_OR_NEWER;MIRROR_70_0_OR_NEWER;MIRROR_71_0_OR_NEWER
-    Standalone: MIRROR;MIRROR_55_0_OR_NEWER;MIRROR_57_0_OR_NEWER;MIRROR_58_0_OR_NEWER;MIRROR_65_0_OR_NEWER;MIRROR_66_0_OR_NEWER;MIRROR_2022_9_OR_NEWER;MIRROR_2022_10_OR_NEWER;MIRROR_70_0_OR_NEWER;MIRROR_71_0_OR_NEWER
-    WebGL: MIRROR;MIRROR_55_0_OR_NEWER;MIRROR_57_0_OR_NEWER;MIRROR_58_0_OR_NEWER;MIRROR_65_0_OR_NEWER;MIRROR_66_0_OR_NEWER;MIRROR_2022_9_OR_NEWER;MIRROR_2022_10_OR_NEWER;MIRROR_70_0_OR_NEWER;MIRROR_71_0_OR_NEWER
+    Server: MIRROR;MIRROR_55_0_OR_NEWER;MIRROR_57_0_OR_NEWER;MIRROR_58_0_OR_NEWER;MIRROR_65_0_OR_NEWER;MIRROR_66_0_OR_NEWER;MIRROR_2022_9_OR_NEWER;MIRROR_2022_10_OR_NEWER;MIRROR_70_0_OR_NEWER;MIRROR_71_0_OR_NEWER;MIRROR_73_OR_NEWER
+    Standalone: MIRROR;MIRROR_55_0_OR_NEWER;MIRROR_57_0_OR_NEWER;MIRROR_58_0_OR_NEWER;MIRROR_65_0_OR_NEWER;MIRROR_66_0_OR_NEWER;MIRROR_2022_9_OR_NEWER;MIRROR_2022_10_OR_NEWER;MIRROR_70_0_OR_NEWER;MIRROR_71_0_OR_NEWER;MIRROR_73_OR_NEWER
+    WebGL: MIRROR;MIRROR_55_0_OR_NEWER;MIRROR_57_0_OR_NEWER;MIRROR_58_0_OR_NEWER;MIRROR_65_0_OR_NEWER;MIRROR_66_0_OR_NEWER;MIRROR_2022_9_OR_NEWER;MIRROR_2022_10_OR_NEWER;MIRROR_70_0_OR_NEWER;MIRROR_71_0_OR_NEWER;MIRROR_73_OR_NEWER
   additionalCompilerArguments: {}
   platformArchitecture: {}
   scriptingBackend: