diff --git a/mappings/net/minecraft/util/registry/RegistryLookupCodec.mapping b/mappings/net/minecraft/util/registry/RegistryLookupCodec.mapping
new file mode 100644
index 0000000000..1872819d54
--- /dev/null
+++ b/mappings/net/minecraft/util/registry/RegistryLookupCodec.mapping
@@ -0,0 +1,6 @@
+CLASS net/minecraft/class_5505 net/minecraft/util/registry/RegistryLookupCodec
+	FIELD field_26737 registryKey Lnet/minecraft/class_5321;
+	METHOD <init> (Lnet/minecraft/class_5321;)V
+		ARG 1 registryKey
+	METHOD method_31148 of (Lnet/minecraft/class_5321;)Lnet/minecraft/class_5505;
+		ARG 0 registryKey
diff --git a/mappings/net/minecraft/world/biome/Biomes.mapping b/mappings/net/minecraft/world/biome/Biomes.mapping
index c69efd96f0..591b346519 100644
--- a/mappings/net/minecraft/world/biome/Biomes.mapping
+++ b/mappings/net/minecraft/world/biome/Biomes.mapping
@@ -1,2 +1,10 @@
-CLASS net/minecraft/class_1972 net/minecraft/world/biome/Biomes
-	METHOD method_8775 register (Ljava/lang/String;)Lnet/minecraft/class_5321;
+CLASS net/minecraft/class_5504 net/minecraft/world/biome/Biomes
+	FIELD field_26734 PLAINS Lnet/minecraft/class_1959;
+	FIELD field_26735 THE_VOID Lnet/minecraft/class_1959;
+	FIELD field_26736 BIOMES Lit/unimi/dsi/fastutil/ints/Int2ObjectMap;
+	METHOD method_31144 fromRawId (I)Lnet/minecraft/class_5321;
+		ARG 0 rawId
+	METHOD method_31145 register (ILnet/minecraft/class_5321;Lnet/minecraft/class_1959;)Lnet/minecraft/class_1959;
+		ARG 0 rawId
+		ARG 1 registryKey
+		ARG 2 biome
diff --git a/mappings/net/minecraft/world/biome/BuiltInBiomes.mapping b/mappings/net/minecraft/world/biome/BuiltInBiomes.mapping
new file mode 100644
index 0000000000..50409a5337
--- /dev/null
+++ b/mappings/net/minecraft/world/biome/BuiltInBiomes.mapping
@@ -0,0 +1,3 @@
+CLASS net/minecraft/class_1972 net/minecraft/world/biome/BuiltInBiomes
+	METHOD method_8775 register (Ljava/lang/String;)Lnet/minecraft/class_5321;
+		ARG 0 name