diff --git a/gradle.properties b/gradle.properties
index 6371959a..e06e20b0 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -5,7 +5,7 @@ org.gradle.jvmargs=-Xmx1G
 	# check these on https://fabricmc.net/use
     # or better: https://modmuss50.me/fabric.html
 	minecraft_version=1.16.2
-	yarn_mappings=1.16.2+build.1
+	yarn_mappings=1.16.2+build.12
 	loader_version=0.9.1+build.205
 
 # Mod Properties
diff --git a/src/main/java/carpet/helpers/FeatureGenerator.java b/src/main/java/carpet/helpers/FeatureGenerator.java
index ce7102e8..264c8da7 100644
--- a/src/main/java/carpet/helpers/FeatureGenerator.java
+++ b/src/main/java/carpet/helpers/FeatureGenerator.java
@@ -18,8 +18,8 @@ import net.minecraft.util.registry.BuiltinRegistries;
 import net.minecraft.util.registry.Registry;
 import net.minecraft.util.registry.RegistryKey;
 import net.minecraft.world.biome.Biome;
-import net.minecraft.world.biome.Biomes;
-import net.minecraft.world.biome.BuiltInBiomes;
+import net.minecraft.world.biome.BiomeKeys;
+import net.minecraft.world.biome.BuiltinBiomes;
 import net.minecraft.world.biome.source.BiomeAccess;
 import net.minecraft.world.gen.ChunkRandom;
 import net.minecraft.world.gen.chunk.ChunkGenerator;
@@ -54,7 +54,7 @@ public class FeatureGenerator
         {
             return ((StructureFeatureInterface)structureFeature.feature).plopAnywhere(
                     world, pos, world.getChunkManager().getChunkGenerator(),
-                    false, world.getRegistryManager().get(Registry.BIOME_KEY).method_31140(BuiltInBiomes.PLAINS), structureFeature.config);
+                    false, world.getRegistryManager().get(Registry.BIOME_KEY).get(BiomeKeys.PLAINS), structureFeature.config);
 
         }
 
@@ -91,7 +91,7 @@ public class FeatureGenerator
     {
         return ((StructureFeatureInterface)structureFeature.feature).plopAnywhere(
                     world, pos, world.getChunkManager().getChunkGenerator(),
-                    true, Biomes.PLAINS, structureFeature.config);
+                    true, BuiltinBiomes.PLAINS, structureFeature.config);
     }
 
     @FunctionalInterface
@@ -130,7 +130,7 @@ public class FeatureGenerator
     }
     private static Thing setupCustomStructure(StructureFeature structure, FeatureConfig conf, RegistryKey<Biome> biome, boolean wireOnly)
         {
-        return (w, p) -> ((StructureFeatureInterface)structure).plopAnywhere(w, p, w.getChunkManager().getChunkGenerator(), wireOnly, w.getRegistryManager().get(Registry.BIOME_KEY).method_31140(biome), conf);
+        return (w, p) -> ((StructureFeatureInterface)structure).plopAnywhere(w, p, w.getChunkManager().getChunkGenerator(), wireOnly, w.getRegistryManager().get(Registry.BIOME_KEY).get(biome), conf);
     }
 
     public static Boolean spawn(String name, ServerWorld world, BlockPos pos)
@@ -154,7 +154,7 @@ public class FeatureGenerator
     {
         long seed = world.getSeed();
         ChunkGenerator generator = world.getChunkManager().getChunkGenerator();
-        StructureConfig params = generator.getConfig().getForType(structure);
+        StructureConfig params = generator.getStructuresConfig().getForType(structure);
         if (!generator.getBiomeSource().hasStructureFeature(structure))
             return null;
         BiomeAccess biomeAccess = world.getBiomeAccess().withSource(generator.getBiomeSource());
@@ -198,7 +198,7 @@ public class FeatureGenerator
                         ),
                         StructurePool.Projection.RIGID
                 ), 6),
-                BuiltInBiomes.NETHER_WASTES
+                BiomeKeys.NETHER_WASTES
         ));
         put("bastion_remnant_hoglin_stable", spawnCustomStructure(
                 StructureFeature.BASTION_REMNANT,
@@ -210,7 +210,7 @@ public class FeatureGenerator
                         ),
                         StructurePool.Projection.RIGID
                 ), 6),
-                BuiltInBiomes.NETHER_WASTES
+                BiomeKeys.NETHER_WASTES
         ));
         put("bastion_remnant_treasure", spawnCustomStructure(
                 StructureFeature.BASTION_REMNANT,
@@ -222,7 +222,7 @@ public class FeatureGenerator
                         ),
                         StructurePool.Projection.RIGID
                 ), 6),
-                BuiltInBiomes.NETHER_WASTES
+                BiomeKeys.NETHER_WASTES
         ));
         put("bastion_remnant_bridge", spawnCustomStructure(
                 StructureFeature.BASTION_REMNANT,
@@ -234,7 +234,7 @@ public class FeatureGenerator
                         ),
                         StructurePool.Projection.RIGID
                 ), 6),
-                BuiltInBiomes.NETHER_WASTES
+                BiomeKeys.NETHER_WASTES
         ));
     }};
 
diff --git a/src/main/java/carpet/mixins/SaplingBlockMixin.java b/src/main/java/carpet/mixins/SaplingBlockMixin.java
index 1016a9cd..5b1b8425 100644
--- a/src/main/java/carpet/mixins/SaplingBlockMixin.java
+++ b/src/main/java/carpet/mixins/SaplingBlockMixin.java
@@ -8,7 +8,6 @@ import net.minecraft.block.SaplingBlock;
 import net.minecraft.server.world.ServerWorld;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.biome.Biome;
-import net.minecraft.world.biome.Biomes;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;