diff --git a/mappings/net/minecraft/world/biome/BiomeGeneratorSettings.mapping b/mappings/net/minecraft/world/biome/BiomeGeneratorSettings.mapping
index 1b85744ef5..07bed9ab6b 100644
--- a/mappings/net/minecraft/world/biome/BiomeGeneratorSettings.mapping
+++ b/mappings/net/minecraft/world/biome/BiomeGeneratorSettings.mapping
@@ -1,5 +1,5 @@
 CLASS none/auq net/minecraft/world/biome/BiomeGeneratorSettings
-	CLASS none/auq$a
+	CLASS none/auq$a JsonStructure
 		FIELD A useRavines Z
 		FIELD B useWaterLakes Z
 		FIELD C waterLakeChance I
@@ -27,6 +27,7 @@ CLASS none/auq net/minecraft/world/biome/BiomeGeneratorSettings
 		FIELD Y dioriteMaxHeight I
 		FIELD Z andesiteSize I
 		FIELD aA lapisSpread I
+		FIELD a GSON Lcom/google/gson/Gson;
 		FIELD aa andesiteCount I
 		FIELD ab andesiteMinHeight I
 		FIELD ac andesiteMaxHeight I
@@ -78,6 +79,21 @@ CLASS none/auq net/minecraft/world/biome/BiomeGeneratorSettings
 		FIELD x useMineShafts Z
 		FIELD y useTemples Z
 		FIELD z useMonuments Z
+		METHOD a setToDefaults ()V
+		METHOD a deserialize (Ljava/lang/String;)Lnone/auq$a;
+			ARG 0 json
+		METHOD b toBiomeGeneratorSettings ()Lnone/auq;
+		METHOD equals (Ljava/lang/Object;)Z
+			ARG 0 other
+	CLASS none/auq$b JsonStructureDeSerializer
+		METHOD a deserialize (Lcom/google/gson/JsonElement;Ljava/lang/reflect/Type;Lcom/google/gson/JsonDeserializationContext;)Lnone/auq$a;
+			ARG 0 json
+			ARG 1 type
+			ARG 2 context
+		METHOD a serialize (Lnone/auq$a;Ljava/lang/reflect/Type;Lcom/google/gson/JsonSerializationContext;)Lcom/google/gson/JsonElement;
+			ARG 0 json
+			ARG 1 type
+			ARG 2 context
 	FIELD A useWaterLakes Z
 	FIELD B waterLakeChance I
 	FIELD C useLavaLakes Z
@@ -156,3 +172,5 @@ CLASS none/auq net/minecraft/world/biome/BiomeGeneratorSettings
 	FIELD x useTemples Z
 	FIELD y useMonuments Z
 	FIELD z useRavines Z
+	METHOD <init> (Lnone/auq$a;)V
+		ARG 0 jsonStruct