diff --git a/build.gradle.kts b/build.gradle.kts
index bf3f34c..e7e9a36 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -4,7 +4,7 @@ plugins {
     id("signing")
 }
 
-version = "1.21.0-SNAPSHOT"
+version = "1.21.20-SNAPSHOT"
 group = "org.cloudburstmc"
 description = "Updates Minecraft: Bedrock Edition block states to the latest revision"
 
diff --git a/src/main/java/org/cloudburstmc/blockstateupdater/BlockStateUpdater_1_21_10.java b/src/main/java/org/cloudburstmc/blockstateupdater/BlockStateUpdater_1_21_10.java
new file mode 100644
index 0000000..d1de465
--- /dev/null
+++ b/src/main/java/org/cloudburstmc/blockstateupdater/BlockStateUpdater_1_21_10.java
@@ -0,0 +1,234 @@
+package org.cloudburstmc.blockstateupdater;
+
+import org.cloudburstmc.blockstateupdater.util.tagupdater.CompoundTagUpdaterContext;
+
+import java.util.function.Function;
+
+public class BlockStateUpdater_1_21_10 implements BlockStateUpdater {
+
+    public static final BlockStateUpdater INSTANCE = new BlockStateUpdater_1_21_10();
+
+    @Override
+    public void registerUpdaters(CompoundTagUpdaterContext ctx) {
+        this.addTypeUpdater(ctx, "minecraft:stone_block_slab2", "stone_slab_type_2", type -> {
+            switch (type) {
+                case "prismarine_rough":
+                    return "minecraft:prismarine_slab";
+                case "prismarine_dark":
+                    return "minecraft:dark_prismarine_slab";
+                case "smooth_sandstone":
+                    return "minecraft:smooth_sandstone_slab";
+                case "purpur":
+                    return "minecraft:purpur_slab";
+                case "red_nether_brick":
+                    return "minecraft:red_nether_brick_slab";
+                case "prismarine_brick":
+                    return "minecraft:prismarine_brick_slab";
+                case "mossy_cobblestone":
+                    return "minecraft:mossy_cobblestone_slab";
+                case "red_sandstone":
+                default:
+                    return "minecraft:red_sandstone_slab";
+            }
+        });
+
+        this.addTypeUpdater(ctx, "minecraft:stone_block_slab3", "stone_slab_type_3", type -> {
+            switch (type) {
+                case "smooth_red_sandstone":
+                    return "minecraft:smooth_red_sandstone_slab";
+                case "polished_granite":
+                    return "minecraft:polished_granite_slab";
+                case "granite":
+                    return "minecraft:granite_slab";
+                case "polished_diorite":
+                    return "minecraft:polished_diorite_slab";
+                case "andesite":
+                    return "minecraft:andesite_slab";
+                case "polished_andesite":
+                    return "minecraft:polished_andesite_slab";
+                case "diorite":
+                    return "minecraft:diorite_slab";
+                case "end_stone_brick":
+                default:
+                    return "minecraft:end_stone_brick_slab";
+            }
+        });
+
+        this.addTypeUpdater(ctx, "minecraft:stone_block_slab4", "stone_slab_type_4", type -> {
+            switch (type) {
+                case "smooth_quartz":
+                    return "minecraft:smooth_quartz_slab";
+                case "cut_sandstone":
+                    return "minecraft:cut_sandstone_slab";
+                case "cut_red_sandstone":
+                    return "minecraft:cut_red_sandstone_slab";
+                case "stone":
+                    return "minecraft:normal_stone_slab";
+                case "mossy_stone_brick":
+                default:
+                    return "minecraft:mossy_stone_brick_slab";
+            }
+        });
+
+        this.addTypeUpdater(ctx, "minecraft:double_stone_block_slab", "stone_slab_type", type -> {
+            switch (type) {
+                case "quartz":
+                    return "minecraft:quartz_double_slab";
+                case "wood":
+                    return "minecraft:petrified_oak_double_slab";
+                case "stone_brick":
+                    return "minecraft:stone_brick_double_slab";
+                case "brick":
+                    return "minecraft:brick_double_slab";
+                case "sandstone":
+                    return "minecraft:sandstone_double_slab";
+                case "nether_brick":
+                    return "minecraft:nether_brick_double_slab";
+                case "cobblestone":
+                    return "minecraft:cobblestone_double_slab";
+                case "smooth_stone":
+                default:
+                    return "minecraft:smooth_stone_double_slab";
+            }
+        });
+
+        this.addTypeUpdater(ctx, "minecraft:double_stone_block_slab2", "stone_slab_type_2", type -> {
+            switch (type) {
+                case "prismarine_rough":
+                    return "minecraft:prismarine_double_slab";
+                case "prismarine_dark":
+                    return "minecraft:dark_prismarine_double_slab";
+                case "smooth_sandstone":
+                    return "minecraft:smooth_sandstone_double_slab";
+                case "purpur":
+                    return "minecraft:purpur_double_slab";
+                case "red_nether_brick":
+                    return "minecraft:red_nether_brick_double_slab";
+                case "prismarine_brick":
+                    return "minecraft:prismarine_brick_double_slab";
+                case "mossy_cobblestone":
+                    return "minecraft:mossy_cobblestone_double_slab";
+                case "red_sandstone":
+                default:
+                    return "minecraft:red_sandstone_double_slab";
+            }
+        });
+
+        this.addTypeUpdater(ctx, "minecraft:double_stone_block_slab3", "stone_slab_type_3", type -> {
+            switch (type) {
+                case "smooth_red_sandstone":
+                    return "minecraft:smooth_red_sandstone_double_slab";
+                case "polished_granite":
+                    return "minecraft:polished_granite_double_slab";
+                case "granite":
+                    return "minecraft:granite_double_slab";
+                case "polished_diorite":
+                    return "minecraft:polished_diorite_double_slab";
+                case "andesite":
+                    return "minecraft:andesite_double_slab";
+                case "polished_andesite":
+                    return "minecraft:polished_andesite_double_slab";
+                case "diorite":
+                    return "minecraft:diorite_double_slab";
+                case "end_stone_brick":
+                default:
+                    return "minecraft:end_stone_brick_double_slab";
+            }
+        });
+
+        this.addTypeUpdater(ctx, "minecraft:double_stone_block_slab4", "stone_slab_type_4", type -> {
+            switch (type) {
+                case "smooth_quartz":
+                    return "minecraft:smooth_quartz_double_slab";
+                case "cut_sandstone":
+                    return "minecraft:cut_sandstone_double_slab";
+                case "cut_red_sandstone":
+                    return "minecraft:cut_red_sandstone_double_slab";
+                case "stone":
+                    return "minecraft:normal_stone_double_slab";
+                case "mossy_stone_brick":
+                default:
+                    return "minecraft:mossy_stone_brick_double_slab";
+            }
+        });
+
+        this.addTypeUpdater(ctx, "minecraft:prismarine", "prismarine_block_type", type -> {
+            switch (type) {
+                case "bricks":
+                    return "minecraft:prismarine_bricks";
+                case "dark":
+                    return "minecraft:dark_prismarine";
+                case "default":
+                default:
+                    return "minecraft:prismarine";
+            }
+        });
+
+        this.addCoralUpdater(ctx, "minecraft:coral_fan_hang", "tube_coral_wall_fan", "brain_coral_wall_fan");
+        this.addCoralUpdater(ctx, "minecraft:coral_fan_hang2", "bubble_coral_wall_fan", "fire_coral_wall_fan");
+        this.addCoralUpdater(ctx, "minecraft:coral_fan_hang3", "horn_coral_wall_fan", null);
+
+        this.addTypeUpdater(ctx, "minecraft:monster_egg", "monster_egg_stone_type", type -> {
+            switch (type) {
+                case "cobblestone":
+                    return "minecraft:infested_cobblestone";
+                case "stone_brick":
+                    return "minecraft:infested_stone_bricks";
+                case "mossy_stone_brick":
+                    return "minecraft:infested_mossy_stone_bricks";
+                case "cracked_stone_brick":
+                    return "minecraft:infested_cracked_stone_bricks";
+                case "chiseled_stone_brick":
+                    return "minecraft:infested_chiseled_stone_bricks";
+                case "stone":
+                default:
+                    return "minecraft:infested_stone";
+            }
+        });
+
+        this.addTypeUpdater(ctx, "minecraft:stonebrick", "stone_brick_type", type -> {
+            switch (type) {
+                case "mossy":
+                    return "minecraft:mossy_stone_bricks";
+                case "cracked":
+                    return "minecraft:cracked_stone_bricks";
+                case "chiseled":
+                    return "minecraft:chiseled_stone_bricks";
+                case "smooth":
+                    // return "minecraft:smooth_stone_bricks"; // TODO: does not seem to exists anymore
+                case "default":
+                default:
+                    return "minecraft:stone_bricks";
+            }
+        });
+    }
+
+    private void addTypeUpdater(CompoundTagUpdaterContext context, String identifier, String typeState, Function<String, String> rename) {
+        context.addUpdater(1, 21, 10)
+                .match("name", identifier)
+                .visit("states")
+                .edit(typeState, helper -> helper.getRootTag().put("name", rename.apply((String) helper.getTag())))
+                .remove(typeState);
+
+    }
+
+    private void addCoralUpdater(CompoundTagUpdaterContext context, String identifier, String type1, String type2) {
+        context.addUpdater(1, 21, 10)
+                .match("name", identifier)
+                .edit("states", helper -> {
+                    Object deadBit = helper.getCompoundTag().remove("dead_bit");
+                    boolean dead = deadBit instanceof Byte && (byte) deadBit == 1 || deadBit instanceof Boolean && (boolean) deadBit;
+
+                    Object typeBit = helper.getCompoundTag().remove("coral_hang_type_bit"); // always remove
+
+                    String type;
+                    if (type2 == null) {
+                        type = type1;
+                    } else {
+                        type = (typeBit instanceof Byte && (byte) typeBit == 1 || typeBit instanceof Boolean && (boolean) typeBit) ? type2 : type1;
+                    }
+                    helper.getRootTag().put("name", dead ? "minecraft:dead_" + type : "minecraft:" + type);
+                });
+
+    }
+}
diff --git a/src/main/java/org/cloudburstmc/blockstateupdater/BlockStateUpdater_1_21_20.java b/src/main/java/org/cloudburstmc/blockstateupdater/BlockStateUpdater_1_21_20.java
new file mode 100644
index 0000000..233dbe0
--- /dev/null
+++ b/src/main/java/org/cloudburstmc/blockstateupdater/BlockStateUpdater_1_21_20.java
@@ -0,0 +1,112 @@
+package org.cloudburstmc.blockstateupdater;
+
+import org.cloudburstmc.blockstateupdater.util.tagupdater.CompoundTagUpdaterContext;
+
+import java.util.function.Function;
+
+public class BlockStateUpdater_1_21_20 implements BlockStateUpdater {
+
+    public static final BlockStateUpdater INSTANCE = new BlockStateUpdater_1_21_20();
+
+    @Override
+    public void registerUpdaters(CompoundTagUpdaterContext ctx) {
+        ctx.addUpdater(1, 21, 20)
+                .match("name", "minecraft:light_block")
+                .visit("states")
+                .edit("block_light_level", helper -> helper.getRootTag().put("name", "minecraft:light_block_" + helper.getTag()))
+                .remove("block_light_level");
+
+
+        this.addTypeUpdater(ctx, "minecraft:sandstone", "sand_stone_type", type -> {
+            switch (type) {
+                case "cut":
+                    return "minecraft:cut_sandstone";
+                case "heiroglyphs":
+                    return "minecraft:chiseled_sandstone";
+                case "smooth":
+                    return "minecraft:smooth_sandstone";
+                case "default":
+                default:
+                    return "minecraft:sandstone";
+            }
+        });
+
+        this.addTypeUpdater(ctx, "minecraft:quartz_block", "chisel_type", type -> {
+            switch (type) {
+                case "chiseled":
+                    return "minecraft:chiseled_quartz_block";
+                case "lines":
+                    return "minecraft:quartz_pillar";
+                case "smooth":
+                    return "minecraft:smooth_quartz";
+                case "default":
+                default:
+                    return "minecraft:quartz_block";
+            }
+        });
+
+        this.addTypeUpdater(ctx, "minecraft:red_sandstone", "sand_stone_type", type -> {
+            switch (type) {
+                case "cut":
+                    return "minecraft:cut_red_sandstone";
+                case "heiroglyphs":
+                    return "minecraft:chiseled_red_sandstone";
+                case "smooth":
+                    return "minecraft:smooth_red_sandstone";
+                case "default":
+                default:
+                    return "minecraft:red_sandstone";
+            }
+        });
+
+        this.addTypeUpdater(ctx, "minecraft:sand", "sand_type", type -> {
+            switch (type) {
+                case "red":
+                    return "minecraft:red_sand";
+                case "normal":
+                default:
+                    return "minecraft:sand";
+            }
+        });
+
+        this.addTypeUpdater(ctx, "minecraft:dirt", "dirt_type", type -> {
+            switch (type) {
+                case "coarse":
+                    return "minecraft:coarse_dirt";
+                case "normal":
+                default:
+                    return "minecraft:dirt";
+            }
+        });
+
+        this.addTypeUpdater(ctx, "minecraft:anvil", "damage", type -> {
+            switch (type) {
+                case "broken":
+                    return "minecraft:damaged_anvil";
+                case "slightly_damaged":
+                    return "minecraft:chipped_anvil";
+                case "very_damaged":
+                    return "minecraft:deprecated_anvil";
+                case "undamaged":
+                default:
+                    return "minecraft:anvil";
+            }
+        });
+
+        // Vanilla does not use updater for this block for some reason
+        ctx.addUpdater(1, 21, 20, false, false)
+                .match("name", "minecraft:yellow_flower")
+                .edit("name", helper -> {
+                    helper.replaceWith("name", "minecraft:dandelion");
+                });
+    }
+
+    private void addTypeUpdater(CompoundTagUpdaterContext context, String identifier, String typeState, Function<String, String> rename) {
+        context.addUpdater(1, 21, 20)
+                .match("name", identifier)
+                .visit("states")
+                .edit(typeState, helper -> helper.getRootTag().put("name", rename.apply((String) helper.getTag())))
+                .remove(typeState);
+
+    }
+}
diff --git a/src/main/java/org/cloudburstmc/blockstateupdater/BlockStateUpdaters.java b/src/main/java/org/cloudburstmc/blockstateupdater/BlockStateUpdaters.java
index 28abd9c..9064a6c 100644
--- a/src/main/java/org/cloudburstmc/blockstateupdater/BlockStateUpdaters.java
+++ b/src/main/java/org/cloudburstmc/blockstateupdater/BlockStateUpdaters.java
@@ -41,6 +41,8 @@ public class BlockStateUpdaters {
         updaters.add(BlockStateUpdater_1_20_70.INSTANCE);
         updaters.add(BlockStateUpdater_1_20_80.INSTANCE);
         updaters.add(BlockStateUpdater_1_21_0.INSTANCE);
+        updaters.add(BlockStateUpdater_1_21_10.INSTANCE);
+        updaters.add(BlockStateUpdater_1_21_20.INSTANCE);
 
         CompoundTagUpdaterContext context = new CompoundTagUpdaterContext();
         updaters.forEach(updater -> updater.registerUpdaters(context));