diff --git a/.github/ISSUE_TEMPLATE/bug_report.yml b/.github/ISSUE_TEMPLATE/bug_report.yml
index 0f84e584e..cedd4344f 100644
--- a/.github/ISSUE_TEMPLATE/bug_report.yml
+++ b/.github/ISSUE_TEMPLATE/bug_report.yml
@@ -27,6 +27,7 @@ body:
       description: Which server version are you using? If your server version is not listed, it is not supported. Update to a supported version first.
       multiple: false
       options:
+        - '1.21.3'
         - '1.21.1'
         - '1.20.6'
         - '1.20.4'
diff --git a/Bukkit/src/main/java/com/plotsquared/bukkit/generator/BukkitPlotGenerator.java b/Bukkit/src/main/java/com/plotsquared/bukkit/generator/BukkitPlotGenerator.java
index bfccaeb3d..f713ed350 100644
--- a/Bukkit/src/main/java/com/plotsquared/bukkit/generator/BukkitPlotGenerator.java
+++ b/Bukkit/src/main/java/com/plotsquared/bukkit/generator/BukkitPlotGenerator.java
@@ -52,7 +52,7 @@ import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.EnumSet;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Random;
 import java.util.Set;
@@ -445,7 +445,7 @@ public class BukkitPlotGenerator extends ChunkGenerator implements GeneratorWrap
         private static final List<Biome> BIOMES;
 
         static {
-            Set<Biome> disabledBiomes = EnumSet.of(Biome.CUSTOM);
+            Set<Biome> disabledBiomes = new HashSet<>(List.of(Biome.CUSTOM));
             if (PlotSquared.platform().serverVersion()[1] <= 19) {
                 final Biome cherryGrove = Registry.BIOME.get(NamespacedKey.minecraft("cherry_grove"));
                 if (cherryGrove != null) {
diff --git a/build.gradle.kts b/build.gradle.kts
index 61e41ae93..1d857d51c 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -230,7 +230,7 @@ tasks.getByName<Jar>("jar") {
     enabled = false
 }
 
-val supportedVersions = listOf("1.18.2", "1.19.4", "1.20.6", "1.21.1")
+val supportedVersions = listOf("1.18.2", "1.19.4", "1.20.6", "1.21.1", "1.21.3")
 tasks {
     register("cacheLatestFaweArtifact") {
         val lastSuccessfulBuildUrl = uri("https://ci.athion.net/job/FastAsyncWorldEdit/lastSuccessfulBuild/api/json").toURL()