diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 59629b78..bc1e10bf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,15 +55,19 @@ jobs:
             paper-1.21.1
             paper-1.21.4
             paper-1.21.5
+            paper-1.21.6
             fabric-1.20.1
             fabric-1.21.1
             fabric-1.21.4
             fabric-1.21.5
+            fabric-1.21.6
           distro-groups: |
             paper
             paper
             paper
             paper
+            paper
+            fabric
             fabric
             fabric
             fabric
@@ -73,16 +77,20 @@ jobs:
             Paper 1.21.1
             Paper 1.21.4
             Paper 1.21.5
+            Paper 1.21.6
             Fabric 1.20.1
             Fabric 1.21.1
             Fabric 1.21.4
             Fabric 1.21.5
+            Fabric 1.21.6
           files: |
             target/HuskSync-Bukkit-${{ env.version_name }}+mc.1.20.1.jar
             target/HuskSync-Bukkit-${{ env.version_name }}+mc.1.21.1.jar
             target/HuskSync-Bukkit-${{ env.version_name }}+mc.1.21.4.jar
             target/HuskSync-Bukkit-${{ env.version_name }}+mc.1.21.5.jar
+            target/HuskSync-Bukkit-${{ env.version_name }}+mc.1.21.6.jar
             target/HuskSync-Fabric-${{ env.version_name }}+mc.1.20.1.jar
             target/HuskSync-Fabric-${{ env.version_name }}+mc.1.21.1.jar
             target/HuskSync-Fabric-${{ env.version_name }}+mc.1.21.4.jar
-            target/HuskSync-Fabric-${{ env.version_name }}+mc.1.21.5.jar
\ No newline at end of file
+            target/HuskSync-Fabric-${{ env.version_name }}+mc.1.21.5.jar
+            target/HuskSync-Fabric-${{ env.version_name }}+mc.1.21.6.jar
\ No newline at end of file
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 4834499a..6c4637d6 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -44,15 +44,19 @@ jobs:
             paper-1.21.1
             paper-1.21.4
             paper-1.21.5
+            paper-1.21.6
             fabric-1.20.1
             fabric-1.21.1
             fabric-1.21.4
             fabric-1.21.5
+            fabric-1.21.6
           distro-groups: |
             paper
             paper
             paper
             paper
+            paper
+            fabric
             fabric
             fabric
             fabric
@@ -62,16 +66,20 @@ jobs:
             Paper 1.21.1
             Paper 1.21.4
             Paper 1.21.5
+            Paper 1.21.6
             Fabric 1.20.1
             Fabric 1.21.1
             Fabric 1.21.4
             Fabric 1.21.5
+            Fabric 1.21.6
           files: |
             target/HuskSync-Bukkit-${{ github.event.release.tag_name }}+mc.1.20.1.jar
             target/HuskSync-Bukkit-${{ github.event.release.tag_name }}+mc.1.21.1.jar
             target/HuskSync-Bukkit-${{ github.event.release.tag_name }}+mc.1.21.4.jar
             target/HuskSync-Bukkit-${{ github.event.release.tag_name }}+mc.1.21.5.jar
+            target/HuskSync-Bukkit-${{ github.event.release.tag_name }}+mc.1.21.6.jar
             target/HuskSync-Fabric-${{ github.event.release.tag_name }}+mc.1.20.1.jar
             target/HuskSync-Fabric-${{ github.event.release.tag_name }}+mc.1.21.1.jar
             target/HuskSync-Fabric-${{ github.event.release.tag_name }}+mc.1.21.4.jar
-            target/HuskSync-Fabric-${{ github.event.release.tag_name }}+mc.1.21.5.jar
\ No newline at end of file
+            target/HuskSync-Fabric-${{ github.event.release.tag_name }}+mc.1.21.5.jar
+            target/HuskSync-Fabric-${{ github.event.release.tag_name }}+mc.1.21.6.jar
\ No newline at end of file
diff --git a/bukkit/1.21.6/gradle.properties b/bukkit/1.21.6/gradle.properties
new file mode 100644
index 00000000..0ff60e36
--- /dev/null
+++ b/bukkit/1.21.6/gradle.properties
@@ -0,0 +1,3 @@
+minecraft_version_numeric=12106
+minecraft_api_version=1.21
+paper_api_version=1.21.6-R0.1-SNAPSHOT
\ No newline at end of file
diff --git a/bukkit/build.gradle b/bukkit/build.gradle
index 751fa76a..44df4dd0 100644
--- a/bukkit/build.gradle
+++ b/bukkit/build.gradle
@@ -8,9 +8,9 @@ plugins {
 dependencies {
     implementation project(path: ':common')
 
-    implementation 'net.william278.uniform:uniform-bukkit:1.3.4'
-    implementation 'net.william278.uniform:uniform-paper:1.3.4'
-    implementation 'net.william278.toilet:toilet-bukkit:1.0.13'
+    implementation 'net.william278.uniform:uniform-bukkit:1.3.5'
+    implementation 'net.william278.uniform:uniform-paper:1.3.5'
+    implementation 'net.william278.toilet:toilet-bukkit:1.0.14'
     implementation 'net.william278:mpdbdataconverter:1.0.1'
     implementation 'net.william278:hsldataconverter:1.0'
     implementation 'net.william278:mapdataapi:2.0'
diff --git a/bukkit/src/main/java/net/william278/husksync/BukkitHuskSync.java b/bukkit/src/main/java/net/william278/husksync/BukkitHuskSync.java
index 9666d24c..cd7b0262 100644
--- a/bukkit/src/main/java/net/william278/husksync/BukkitHuskSync.java
+++ b/bukkit/src/main/java/net/william278/husksync/BukkitHuskSync.java
@@ -354,9 +354,11 @@ public class BukkitHuskSync extends JavaPlugin implements HuskSync, BukkitTask.S
             case "1.20.3", "1.20.4" -> DataFixerUtil.VERSION1_20_4;
             case "1.20.5", "1.20.6" -> DataFixerUtil.VERSION1_20_5;
             case "1.21", "1.21.1" -> DataFixerUtil.VERSION1_21;
-            case "1.21.2", "1.21.3" -> DataFixerUtil.VERSION1_21_2;
-            case "1.21.4" -> 4189;
+            case "1.21.2" -> DataFixerUtil.VERSION1_21_2;
+            case "1.21.3" -> DataFixerUtil.VERSION1_21_3;
+            case "1.21.4" -> DataFixerUtil.VERSION1_21_4;
             case "1.21.5" -> DataFixerUtil.VERSION1_21_5;
+            case "1.21.6" -> 4435;
             default -> DataFixerUtil.getCurrentVersion();
         };
     }
diff --git a/common/build.gradle b/common/build.gradle
index 3a8b2524..a6dd3fe0 100644
--- a/common/build.gradle
+++ b/common/build.gradle
@@ -17,15 +17,15 @@ dependencies {
         exclude module: 'slf4j-api'
     }
 
-    compileOnlyApi 'net.william278.toilet:toilet-common:1.0.13'
+    compileOnlyApi 'net.william278.toilet:toilet-common:1.0.14'
 
-    compileOnly 'net.william278.uniform:uniform-common:1.3.4'
+    compileOnly 'net.william278.uniform:uniform-common:1.3.5'
     compileOnly 'com.mojang:brigadier:1.1.8'
     compileOnly 'org.projectlombok:lombok:1.18.38'
     compileOnly 'org.jetbrains:annotations:26.0.2'
-    compileOnly 'net.kyori:adventure-api:4.21.0'
+    compileOnly 'net.kyori:adventure-api:4.23.0'
     compileOnly 'net.kyori:adventure-platform-api:4.4.0'
-    compileOnly "net.kyori:adventure-text-serializer-plain:4.21.0"
+    compileOnly "net.kyori:adventure-text-serializer-plain:4.23.0"
     compileOnly 'com.google.guava:guava:33.4.8-jre'
     compileOnly 'com.github.plan-player-analytics:Plan:5.6.2965'
     compileOnly "redis.clients:jedis:$jedis_version"
diff --git a/fabric/1.21.6/gradle.properties b/fabric/1.21.6/gradle.properties
new file mode 100644
index 00000000..d7e7c4a5
--- /dev/null
+++ b/fabric/1.21.6/gradle.properties
@@ -0,0 +1,7 @@
+essential.defaults.loom.mappings=net.fabricmc:yarn:1.21.6+build.1:v2
+
+fabric_loader_version=0.16.14
+fabric_api_version=0.127.1+1.21.6
+fabric_permissions_api_version=0.4.0
+fabric_adventure_platform_version=6.5.0-SNAPSHOT
+fabric_sgui_version=1.10.0+1.21.6
\ No newline at end of file
diff --git a/fabric/build.gradle b/fabric/build.gradle
index 640f14f1..c59a2c42 100644
--- a/fabric/build.gradle
+++ b/fabric/build.gradle
@@ -14,8 +14,8 @@ dependencies {
     modImplementation include("net.kyori:adventure-platform-fabric:${fabric_adventure_platform_version}")
     modImplementation include("me.lucko:fabric-permissions-api:${fabric_permissions_api_version}")
     modImplementation include("eu.pb4:sgui:${fabric_sgui_version}")
-    modImplementation include("net.william278.uniform:uniform-fabric:1.3.4+${project.name}")
-    modImplementation include("net.william278.toilet:toilet-fabric:1.0.13+${project.name}")
+    modImplementation include("net.william278.uniform:uniform-fabric:1.3.5+${project.name}")
+    modImplementation include("net.william278.toilet:toilet-fabric:1.0.14+${project.name}")
     modImplementation "net.fabricmc.fabric-api:fabric-api:${fabric_api_version}"
 
     // Manually include config deps due to the way including api deps works
diff --git a/fabric/mainProject b/fabric/mainProject
index d6a49eb3..6e83421e 100644
--- a/fabric/mainProject
+++ b/fabric/mainProject
@@ -1 +1 @@
-1.21.5
\ No newline at end of file
+1.21.6
\ No newline at end of file
diff --git a/fabric/root.gradle b/fabric/root.gradle
index dc897152..1e8b0503 100644
--- a/fabric/root.gradle
+++ b/fabric/root.gradle
@@ -3,13 +3,15 @@ plugins {
 }
 
 preprocess {
+    def fabric12106 = createNode("1.21.6", 12106, "yarn")
     def fabric12105 = createNode("1.21.5", 12105, "yarn")
     def fabric12104 = createNode("1.21.4", 12104, "yarn")
     def fabric12101 = createNode("1.21.1", 12101, "yarn")
     def fabric12001 = createNode("1.20.1", 12001, "yarn")
 
     strictExtraMappings.set(true)
-    fabric12104.link(fabric12105, null)
-    fabric12101.link(fabric12105, null)
-    fabric12001.link(fabric12105, null)
+    fabric12105.link(fabric12106, null)
+    fabric12104.link(fabric12106, null)
+    fabric12101.link(fabric12106, null)
+    fabric12001.link(fabric12106, null)
 }
\ No newline at end of file
diff --git a/fabric/src/main/java/net/william278/husksync/FabricHuskSync.java b/fabric/src/main/java/net/william278/husksync/FabricHuskSync.java
index 2e3a0082..1fc97588 100644
--- a/fabric/src/main/java/net/william278/husksync/FabricHuskSync.java
+++ b/fabric/src/main/java/net/william278/husksync/FabricHuskSync.java
@@ -99,8 +99,9 @@ public class FabricHuskSync implements DedicatedServerModInitializer, HuskSync,
     private static final int VERSION1_20_5 = 3837;
     private static final int VERSION1_21_1 = 3955;
     private static final int VERSION1_21_3 = 4082;
-    private static final int VERSION1_21_4 = 4189; // Current
+    private static final int VERSION1_21_4 = 4189;
     private static final int VERSION1_21_5 = 4323;
+    private static final int VERSION1_21_6 = 4435;
 
     private final HashMap<Identifier, Serializer<? extends Data>> serializers = Maps.newHashMap();
     private final Map<UUID, Map<Identifier, Data>> playerCustomDataStore = Maps.newConcurrentMap();
@@ -387,10 +388,13 @@ public class FabricHuskSync implements DedicatedServerModInitializer, HuskSync,
             case "1.21.2", "1.21.3" -> VERSION1_21_3;
             case "1.21.4" -> VERSION1_21_4;
             case "1.21.5" -> VERSION1_21_5;
-            //#if MC==12105
+            case "1.21.6" -> VERSION1_21_6;
+            //#if MC==12106
+            default -> VERSION1_21_6;
+            //#elseif MC==12105
             //$$ default -> VERSION1_21_5;
             //#elseif MC==12104
-            default -> VERSION1_21_4;
+            //$$ default -> VERSION1_21_4;
             //#elseif MC==12101
             //$$ default -> VERSION1_21_1;
             //#elseif MC==12001
diff --git a/fabric/src/main/java/net/william278/husksync/data/FabricSerializer.java b/fabric/src/main/java/net/william278/husksync/data/FabricSerializer.java
index ceba6566..e2a0db6c 100644
--- a/fabric/src/main/java/net/william278/husksync/data/FabricSerializer.java
+++ b/fabric/src/main/java/net/william278/husksync/data/FabricSerializer.java
@@ -272,12 +272,14 @@ public abstract class FabricSerializer {
         }
 
         @Nullable
-        private NbtCompound encodeNbt(@NotNull ItemStack item, @NotNull DynamicRegistryManager registryManager) {
+        private NbtCompound encodeNbt(@NotNull ItemStack item, @NotNull DynamicRegistryManager reg) {
             try {
-                //#if MC>=12104
-                return (NbtCompound) item.toNbt(registryManager);
+                //#if MC>=12106
+                return (NbtCompound) ItemStack.CODEC.encodeStart(reg.getOps(NbtOps.INSTANCE), item).getOrThrow();
+                //#elseif MC>=12104
+                //$$ return (NbtCompound) item.toNbt(reg);
                 //#elseif MC==12101
-                //$$ return (NbtCompound) item.encode(registryManager);
+                //$$ return (NbtCompound) item.encode(reg);
                 //#elseif MC==12001
                 //$$ final NbtCompound compound = new NbtCompound();
                 //$$ item.writeNbt(compound);
@@ -289,14 +291,16 @@ public abstract class FabricSerializer {
         }
 
         @NotNull
-        private ItemStack decodeNbt(@NotNull NbtElement item, @NotNull DynamicRegistryManager registryManager) {
-            //#if MC==12001
+        private ItemStack decodeNbt(@NotNull NbtElement item, @NotNull DynamicRegistryManager reg) {
+            //#if MC>=12106
+            final @Nullable ItemStack stack = ItemStack.CODEC.decode(reg.getOps(NbtOps.INSTANCE), item).getOrThrow().getFirst();
+            //#elseif MC>12001
+            //$$ final @Nullable ItemStack stack = ItemStack.fromNbt(reg, item).orElse(null);
+            //#elseif MC==12001
             //$$ final @Nullable ItemStack stack = ItemStack.fromNbt((NbtCompound) item);
-            //#else
-            final @Nullable ItemStack stack = ItemStack.fromNbt(registryManager, item).orElse(null);
             //#endif
             if (stack == null) {
-                throw new IllegalStateException("Failed to decode item NBT (got null 'fromNbt'): (%s)".formatted(item));
+                throw new IllegalStateException("Failed to decode item NBT (decode got null): (%s)".formatted(item));
             }
             return stack;
         }
diff --git a/gradle.properties b/gradle.properties
index 2a93b303..f007f804 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -4,7 +4,7 @@ org.gradle.daemon=true
 javaVersion=21
 
 # Plugin metadata
-plugin_version=3.8.4
+plugin_version=3.8.5
 plugin_archive=husksync
 plugin_description=A modern, cross-server player data synchronization system