diff --git a/build.gradle b/build.gradle
index 264b8af..e6ff99c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ plugins {
 }
 
 group = 'org.infotoast'
-version = '5.0'
+version = '5.1'
 
 repositories {
     mavenCentral()
@@ -24,8 +24,8 @@ repositories {
 }
 
 dependencies {
-    compileOnly 'io.papermc.paper:paper-api:1.21.1-R0.1-SNAPSHOT'
-    implementation 'de.tr7zw:item-nbt-api:2.13.2'
+    compileOnly 'io.papermc.paper:paper-api:1.21.3-R0.1-SNAPSHOT'
+    implementation 'de.tr7zw:item-nbt-api:2.14.0'
 }
 
 def targetJavaVersion = 21
@@ -56,7 +56,7 @@ processResources {
 
 tasks {
     runServer {
-        minecraftVersion("1.21.1")
+        minecraftVersion("1.21.3")
     }
 }
 
diff --git a/src/main/java/org/infotoast/lorax/Populator.java b/src/main/java/org/infotoast/lorax/Populator.java
index a71da37..b289cad 100644
--- a/src/main/java/org/infotoast/lorax/Populator.java
+++ b/src/main/java/org/infotoast/lorax/Populator.java
@@ -59,25 +59,25 @@ private void spawnTree(WorldImproved world, Vector3 v3, int treeType) {
     private void doBiome(WorldImproved world, Random random, int x, int z, LimitedRegion chunk) {
         List<Biome> biomesToTransform = world.getBiome(chunk, x, z, okMats);
         for (int i = 0; i < biomesToTransform.size(); i++) {
-            switch (biomesToTransform.get(i)) {
-                case BIRCH_FOREST:
-                case OLD_GROWTH_BIRCH_FOREST:
+            switch (biomesToTransform.get(i).translationKey()) {
+                case "biome.minecraft.birch_forest":
+                case "biome.minecraft.old_growth_birch_forest":
                     doBirch(world, random, x, z, chunk);
                     break;
-                case FOREST:
-                case FLOWER_FOREST:
+                case "biome.minecraft.forest":
+                case "biome.minecraft.flower_forest":
                     doOak(world, random, x, z, chunk);
                     break;
-                case TAIGA:
-                case GROVE:
-                case SNOWY_TAIGA:
+                case "biome.minecraft.taiga":
+                case "biome.minecraft.grove":
+                case "biome.minecraft.snowy_taiga":
                     doSpruce(world, random, x, z, chunk);
                     break;
-                case SAVANNA:
-                case SAVANNA_PLATEAU:
+                case "biome.minecraft.savanna":
+                case "biome.minecraft.savanna_plateau":
                     doAcacia(world, random, x, z, chunk);
                     break;
-                case DARK_FOREST:
+                case "biome.minecraft.dark_forest":
                     doDarkOak(world, random, x, z, chunk);
             }
         }
diff --git a/src/main/resources/plugin.yml b/src/main/resources/plugin.yml
index c82fcc8..6aa7d02 100644
--- a/src/main/resources/plugin.yml
+++ b/src/main/resources/plugin.yml
@@ -1,7 +1,7 @@
 name: Lorax
 version: '${version}'
 main: org.infotoast.lorax.Lorax
-api-version: 1.20
+api-version: 1.21
 prefix: Lorax
 load: STARTUP
 authors: [ Frank, CoolScreenName ]