diff --git a/src/consts/game_mode.rs b/src/consts/game_mode.rs
index e32c729..d893fdc 100644
--- a/src/consts/game_mode.rs
+++ b/src/consts/game_mode.rs
@@ -6,16 +6,20 @@
 //                                           //
 ///////////////////////////////////////////////
 
-use strum_macros::{ EnumString, Display, AsRefStr, IntoStaticStr };
+use strum_macros::{ EnumString, IntoStaticStr };
 
 /// League of Legends game mode, such as Classic,
 /// ARAM, URF, One For All, Ascension, etc.
 #[non_exhaustive]
-#[derive(Debug, Copy, Clone)]
+#[derive(Debug, Clone)]
 #[derive(Eq, PartialEq, Hash)]
-#[derive(EnumString, Display, AsRefStr, IntoStaticStr)]
+#[derive(EnumString, IntoStaticStr)]
 #[repr(u8)]
 pub enum GameMode {
+    // Catch-all variant for new, unknown game modes.
+    #[strum(default)]
+    UNKNOWN(String),
+
     /// ARAM games
     ARAM,
     /// All Random Summoner's Rift games
@@ -62,4 +66,5 @@ pub enum GameMode {
     URF,
 }
 
+string_enum_str!(GameMode);
 serde_string!(GameMode);
diff --git a/src/consts/macros.rs b/src/consts/macros.rs
index f2196d5..764dddb 100644
--- a/src/consts/macros.rs
+++ b/src/consts/macros.rs
@@ -11,6 +11,7 @@ macro_rules! serde_string {
                 s.parse().map_err(serde::de::Error::custom)
             }
         }
+
         impl serde::ser::Serialize for $name {
             fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
             where
@@ -22,6 +23,25 @@ macro_rules! serde_string {
     };
 }
 
+macro_rules! string_enum_str {
+    ( $name:ident ) => {
+        impl AsRef<str> for $name {
+            fn as_ref(&self) -> &str {
+                match self {
+                    Self::UNKNOWN(string) => &*string,
+                    known => known.into(),
+                }
+            }
+        }
+
+        impl std::fmt::Display for $name {
+            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+                self.as_ref().fmt(f)
+            }
+        }
+    }
+}
+
 macro_rules! arr {
     (
         $( #[$attr:meta] )*
@@ -35,7 +55,7 @@ macro_rules! arr {
 macro_rules! newtype_enum {
     {
         $( #[$attr:meta] )*
-        $v:vis newtype_enum $name:ident($repr:ident) {
+        $v:vis newtype_enum $name:ident($repr:ty) {
             $(
                 $( #[$var_attr:meta] )*
                 $var_name:ident = $var_val:expr,
@@ -50,7 +70,7 @@ macro_rules! newtype_enum {
         impl $name {
             $(
                 $( #[$var_attr] )*
-                $v const $var_name: Self = Self( $var_val );
+                $v const $var_name: Self = Self($var_val);
             )*
         }
 
diff --git a/srcgen/consts/game_mode.rs.dt b/srcgen/consts/game_mode.rs.dt
index 18f563a..8a4ad43 100644
--- a/srcgen/consts/game_mode.rs.dt
+++ b/srcgen/consts/game_mode.rs.dt
@@ -3,16 +3,20 @@
     const gameModes = require('./.gameModes.json');
 }}{{= dotUtils.preamble() }}
 
-use strum_macros::{ EnumString, Display, AsRefStr, IntoStaticStr };
+use strum_macros::{ EnumString, IntoStaticStr };
 
 /// League of Legends game mode, such as Classic,
 /// ARAM, URF, One For All, Ascension, etc.
 #[non_exhaustive]
-#[derive(Debug, Copy, Clone)]
+#[derive(Debug, Clone)]
 #[derive(Eq, PartialEq, Hash)]
-#[derive(EnumString, Display, AsRefStr, IntoStaticStr)]
+#[derive(EnumString, IntoStaticStr)]
 #[repr(u8)]
 pub enum GameMode {
+    // Catch-all variant for new, unknown game modes.
+    #[strum(default)]
+    UNKNOWN(String),
+
 {{
     for (const e of gameModes) {
         const desc = e['x-desc'] ? e['x-desc'].split('\n') : [];
@@ -26,4 +30,5 @@ pub enum GameMode {
 }}
 }
 
+string_enum_str!(GameMode);
 serde_string!(GameMode);