diff --git a/1_20_R4/pom.xml b/1_20_R4/pom.xml
new file mode 100644
index 0000000..623d1a8
--- /dev/null
+++ b/1_20_R4/pom.xml
@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>signgui-parent</artifactId>
+        <groupId>de.rapha149.signgui</groupId>
+        <version>2.3.3</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>signgui-1_20_R4</artifactId>
+
+    <properties>
+        <maven.deploy.skip>true</maven.deploy.skip>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.spigotmc</groupId>
+            <artifactId>spigot</artifactId>
+            <version>1.20.5-R0.1-SNAPSHOT</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>de.rapha149.signgui</groupId>
+            <artifactId>signgui-wrapper</artifactId>
+            <version>${project.parent.version}</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
+                <configuration>
+                    <source>21</source>
+                    <target>21</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/1_20_R4/src/main/java/de/rapha149/signgui/version/Wrapper1_20_R4.java b/1_20_R4/src/main/java/de/rapha149/signgui/version/Wrapper1_20_R4.java
new file mode 100644
index 0000000..bbe13ee
--- /dev/null
+++ b/1_20_R4/src/main/java/de/rapha149/signgui/version/Wrapper1_20_R4.java
@@ -0,0 +1,165 @@
+package de.rapha149.signgui.version;
+
+import de.rapha149.signgui.SignEditor;
+import de.rapha149.signgui.SignGUIChannelHandler;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelPipeline;
+import net.minecraft.core.BlockPosition;
+import net.minecraft.network.NetworkManager;
+import net.minecraft.network.chat.IChatBaseComponent;
+import net.minecraft.network.protocol.Packet;
+import net.minecraft.network.protocol.game.PacketPlayInUpdateSign;
+import net.minecraft.network.protocol.game.PacketPlayOutOpenSignEditor;
+import net.minecraft.server.level.EntityPlayer;
+import net.minecraft.server.network.PlayerConnection;
+import net.minecraft.server.network.ServerCommonPacketListenerImpl;
+import net.minecraft.world.item.EnumColor;
+import net.minecraft.world.level.World;
+import net.minecraft.world.level.block.entity.SignText;
+import net.minecraft.world.level.block.entity.TileEntitySign;
+import org.bukkit.DyeColor;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.craftbukkit.v1_20_R4.entity.CraftPlayer;
+import org.bukkit.entity.Player;
+
+import java.lang.reflect.Field;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import java.util.function.BiConsumer;
+
+public class Wrapper1_20_R4 implements VersionWrapper {
+
+    private final Field NETWORK_MANAGER_FIELD;
+
+    {
+        Field networkManagerField = null;
+        for (Field field : ServerCommonPacketListenerImpl.class.getDeclaredFields()) {
+            if (field.getType() == NetworkManager.class) {
+                field.setAccessible(true);
+                networkManagerField = field;
+                break;
+            }
+        }
+
+        NETWORK_MANAGER_FIELD = networkManagerField;
+    }
+
+    @Override
+    public Material getDefaultType() {
+        return Material.OAK_SIGN;
+    }
+
+    @Override
+    public List<Material> getSignTypes() {
+        return Arrays.asList(Material.OAK_SIGN, Material.BIRCH_SIGN, Material.SPRUCE_SIGN, Material.JUNGLE_SIGN,
+                Material.ACACIA_SIGN, Material.DARK_OAK_SIGN, Material.CRIMSON_SIGN, Material.WARPED_SIGN,
+                Material.CHERRY_SIGN, Material.MANGROVE_SIGN, Material.BAMBOO_SIGN
+        );
+    }
+
+    @Override
+    public void openSignEditor(Player player, String[] lines, Material type, DyeColor color, Location signLoc, BiConsumer<SignEditor, String[]> onFinish) throws IllegalAccessException {
+        EntityPlayer p = ((CraftPlayer) player).getHandle();
+        PlayerConnection conn = p.c;
+
+        if (NETWORK_MANAGER_FIELD == null)
+            throw new IllegalStateException("Unable to find NetworkManager field in PlayerConnection class.");
+        if (!NETWORK_MANAGER_FIELD.canAccess(conn)) {
+            NETWORK_MANAGER_FIELD.setAccessible(true);
+            if (!NETWORK_MANAGER_FIELD.canAccess(conn))
+                throw new IllegalStateException("Unable to access NetworkManager field in PlayerConnection class.");
+        }
+
+        Location loc = signLoc != null ? signLoc : getDefaultLocation(player);
+        BlockPosition pos = new BlockPosition(loc.getBlockX(), loc.getBlockY(), loc.getBlockZ());
+
+        TileEntitySign sign = new TileEntitySign(pos, null);
+        SignText signText = sign.a(true) // flag = front/back of sign
+                .a(EnumColor.valueOf(color.toString()));
+        for (int i = 0; i < lines.length; i++)
+            signText = signText.a(i, IChatBaseComponent.a(lines[i]));
+        sign.a(signText, true);
+
+        boolean schedule = false;
+        NetworkManager manager = (NetworkManager) NETWORK_MANAGER_FIELD.get(conn);
+        ChannelPipeline pipeline = manager.n.pipeline();
+        if (pipeline.names().contains("SignGUI")) {
+            ChannelHandler handler = pipeline.get("SignGUI");
+            if (handler instanceof SignGUIChannelHandler<?> signGUIHandler) {
+                signGUIHandler.close();
+                schedule = signGUIHandler.getBlockPosition().equals(pos);
+            }
+
+            if (pipeline.names().contains("SignGUI"))
+                pipeline.remove("SignGUI");
+        }
+
+        Runnable runnable = () -> {
+            player.sendBlockChange(loc, type.createBlockData());
+            sign.a(p.dP());
+            conn.b(sign.l());
+            sign.a((World) null);
+            conn.b(new PacketPlayOutOpenSignEditor(pos, true)); // flag = front/back of sign
+
+            SignEditor signEditor = new SignEditor(sign, loc, pos, pipeline);
+            pipeline.addAfter("decoder", "SignGUI", new SignGUIChannelHandler<Packet<?>>() {
+
+                @Override
+                public Object getBlockPosition() {
+                    return pos;
+                }
+
+                @Override
+                public void close() {
+                    closeSignEditor(player, signEditor);
+                }
+
+                @Override
+                protected void decode(ChannelHandlerContext chc, Packet<?> packet, List<Object> out) {
+                    try {
+                        if (packet instanceof PacketPlayInUpdateSign updateSign) {
+                            if (updateSign.b().equals(pos))
+                                onFinish.accept(signEditor, updateSign.f());
+                        }
+                    } catch (Exception e) {
+                        e.printStackTrace();
+                    }
+
+                    out.add(packet);
+                }
+            });
+        };
+
+        if (schedule)
+            SCHEDULER.schedule(runnable, 200, TimeUnit.MILLISECONDS);
+        else
+            runnable.run();
+    }
+
+    @Override
+    public void displayNewLines(Player player, SignEditor signEditor, String[] lines) {
+        TileEntitySign sign = (TileEntitySign) signEditor.getSign();
+
+        SignText newSignText = sign.a(true);
+        for (int i = 0; i < lines.length; i++)
+            newSignText = newSignText.a(i, IChatBaseComponent.a(lines[i]));
+        sign.a(newSignText, true);
+
+        EntityPlayer p = ((CraftPlayer) player).getHandle();
+        PlayerConnection conn = p.c;
+        sign.a(p.dP());
+        conn.b(sign.l());
+        sign.a((World) null);
+        conn.b(new PacketPlayOutOpenSignEditor((BlockPosition) signEditor.getBlockPosition(), true));
+    }
+
+    @Override
+    public void closeSignEditor(Player player, SignEditor signEditor) {
+        Location loc = signEditor.getLocation();
+        signEditor.getPipeline().remove("SignGUI");
+        player.sendBlockChange(loc, loc.getBlock().getBlockData());
+    }
+}