diff --git a/build.gradle.kts b/build.gradle.kts
index 546446c..42e487c 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
     id("io.github.gaming32.gradle.preprocess-root") version "0.4.4"
-    id("dev.architectury.loom") version "1.7.415" apply false
+    id("dev.architectury.loom") version "1.7.416" apply false
     id("com.modrinth.minotaur") version "2.8.7" apply false
     id("xyz.wagyourtail.jvmdowngrader") version "1.2.1" apply false
 }
@@ -10,14 +10,18 @@ repositories {
 }
 
 preprocess {
-    val fabric12103 = createNode("1.21.3-fabric", 1_21_03, "yarn")
-    val neoforge12103 = createNode("1.21.3-neoforge", 1_21_03, "yarn")
-    val fabric12101 = createNode("1.21.1-fabric", 1_21_01, "yarn")
-    val neoforge12101 = createNode("1.21.1-neoforge", 1_21_01, "yarn")
-    val fabric12006 = createNode("1.20.6-fabric", 1_20_06, "yarn")
-    val neoforge12006 = createNode("1.20.6-neoforge", 1_20_06, "yarn")
-    val fabric12004 = createNode("1.20.4-fabric", 1_20_04, "yarn")
-    val neoforge12004 = createNode("1.20.4-neoforge", 1_20_04, "yarn")
+    fun createNode(project: String, mcVersion: Int) = createNode(project, mcVersion, "yarn")
+
+    val fabric12104 = createNode("1.21.4-fabric", 1_21_04)
+    val neoforge12104 = createNode("1.21.4-neoforge", 1_21_04)
+    val fabric12103 = createNode("1.21.3-fabric", 1_21_03)
+    val neoforge12103 = createNode("1.21.3-neoforge", 1_21_03)
+    val fabric12101 = createNode("1.21.1-fabric", 1_21_01)
+    val neoforge12101 = createNode("1.21.1-neoforge", 1_21_01)
+    val fabric12006 = createNode("1.20.6-fabric", 1_20_06)
+    val neoforge12006 = createNode("1.20.6-neoforge", 1_20_06)
+    val fabric12004 = createNode("1.20.4-fabric", 1_20_04)
+    val neoforge12004 = createNode("1.20.4-neoforge", 1_20_04)
     val fabric12001 = createNode("1.20.1-fabric", 1_20_01, "yarn")
     val forge12001 = createNode("1.20.1-forge", 1_20_01, "srg")
     val fabric11904 = createNode("1.19.4-fabric", 1_19_04, "yarn")
@@ -25,19 +29,21 @@ preprocess {
     val fabric11902 = createNode("1.19.2-fabric", 1_19_02, "yarn")
     val forge11902 = createNode("1.19.2-forge", 1_19_02, "srg")
 
-    fabric12103.link(neoforge12103)
-    neoforge12103.link(neoforge12101)
-    neoforge12101.link(fabric12101)
-    fabric12101.link(fabric12006)
-    fabric12006.link(neoforge12006)
-    neoforge12006.link(neoforge12004)
-    neoforge12004.link(fabric12004)
-    fabric12004.link(fabric12001)
-    fabric12001.link(forge12001)
-    forge12001.link(forge11904)
-    forge11904.link(fabric11904)
-    fabric11904.link(fabric11902)
-    fabric11902.link(forge11902)
+    fabric12104.link(neoforge12104)
+    neoforge12104.link(neoforge12103)
+    neoforge12103.link(fabric12103)
+    fabric12103.link(fabric12101)
+    fabric12101.link(neoforge12101)
+    neoforge12101.link(neoforge12006)
+    neoforge12006.link(fabric12006)
+    fabric12006.link(fabric12004)
+    fabric12004.link(neoforge12004)
+    neoforge12004.link(forge12001)
+    forge12001.link(fabric12001)
+    fabric12001.link(fabric11904)
+    fabric11904.link(forge11904)
+    forge11904.link(forge11902)
+    forge11902.link(fabric11902)
 }
 
 subprojects {
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 48d44c9..07a7f23 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -32,6 +32,8 @@ listOf(
     "1.21.1-fabric",
     "1.21.3-neoforge",
     "1.21.3-fabric",
+    "1.21.4-neoforge",
+    "1.21.4-fabric",
 ).forEach { version ->
     include(":$version")
     project(":$version").apply {
diff --git a/src/main/java/io/github/gaming32/worldhost/gui/screen/AddFriendScreen.java b/src/main/java/io/github/gaming32/worldhost/gui/screen/AddFriendScreen.java
index 73dd7a8..b7a5b58 100644
--- a/src/main/java/io/github/gaming32/worldhost/gui/screen/AddFriendScreen.java
+++ b/src/main/java/io/github/gaming32/worldhost/gui/screen/AddFriendScreen.java
@@ -127,11 +127,15 @@ protected void init() {
                 .build()
         );
 
-        maxFriends = (cancelY - 90) / 24;
+        //#if MC >= 1.21.4
+        maxFriends = 25;
+        //#else
+        //$$ maxFriends = (cancelY - 94) / 24;
+        //#endif
 
         userList = addRenderableWidget(new UserListWidget(
             font,
-            widgetsX, 90, widgetsWidth, cancelY - 90,
+            widgetsX, 90, widgetsWidth, cancelY - 94,
             this::getActions,
             userList
         ));
diff --git a/src/main/java/io/github/gaming32/worldhost/gui/screen/OnlineFriendsScreen.java b/src/main/java/io/github/gaming32/worldhost/gui/screen/OnlineFriendsScreen.java
index f1554dc..d3ffc71 100644
--- a/src/main/java/io/github/gaming32/worldhost/gui/screen/OnlineFriendsScreen.java
+++ b/src/main/java/io/github/gaming32/worldhost/gui/screen/OnlineFriendsScreen.java
@@ -297,10 +297,12 @@ public boolean keyPressed(int keyCode, int scanCode, int modifiers) {
             return (entry != null && entry.keyPressed(keyCode, scanCode, modifiers)) || super.keyPressed(keyCode, scanCode, modifiers);
         }
 
-        @Override
-        protected int getScrollbarPosition() {
-            return super.getScrollbarPosition() + 30;
-        }
+        //#if MC < 1.21.4
+        //$$ @Override
+        //$$ protected int getScrollbarPosition() {
+        //$$     return super.getScrollbarPosition() + 30;
+        //$$ }
+        //#endif
 
         @Override
         public int getRowWidth() {
diff --git a/src/main/java/io/github/gaming32/worldhost/gui/widget/UserListWidget.java b/src/main/java/io/github/gaming32/worldhost/gui/widget/UserListWidget.java
index 4ef0679..c573ce6 100644
--- a/src/main/java/io/github/gaming32/worldhost/gui/widget/UserListWidget.java
+++ b/src/main/java/io/github/gaming32/worldhost/gui/widget/UserListWidget.java
@@ -1,5 +1,6 @@
 package io.github.gaming32.worldhost.gui.widget;
 
+import com.google.common.collect.Lists;
 import com.mojang.blaze3d.systems.RenderSystem;
 import io.github.gaming32.worldhost.WorldHost;
 import io.github.gaming32.worldhost.gui.screen.WorldHostScreen;
@@ -23,6 +24,8 @@
 import java.util.List;
 import java.util.function.Function;
 
+import static io.github.gaming32.worldhost.gui.screen.WorldHostScreen.*;
+
 //#if MC >= 1.20.0
 import net.minecraft.client.gui.GuiGraphics;
 //#else
@@ -46,7 +49,8 @@ public final class UserListWidget
     //#endif
 {
     private final List<UserInfo> users = new ArrayList<>();
-    private final List<Button> actionButtons = new ArrayList<>();
+    private final List<ActionButtonWrapper> actionButtons = new ArrayList<>();
+    private final List<? extends GuiEventListener> children = Lists.transform(actionButtons, ActionButtonWrapper::button);
     private final Font font;
     private final Function<FriendListFriend, List<Action>> getApplicableActions;
 
@@ -91,6 +95,13 @@ public void renderWidget(
         //#endif
         int mouseX, int mouseY, float partialTick
     ) {
+        pose(context).pushPose();
+
+        //#if MC >= 1.21.4
+        context.enableScissor(getX(), getY(), getX() + width, getY() + height);
+        pose(context).translate(0, -scrollAmount(), 0);
+        //#endif
+
         final int textYOffset = 10 - font.lineHeight / 2;
         final int x = getX();
         int y = getY();
@@ -120,9 +131,22 @@ public void renderWidget(
             }
             y += 24;
         }
-        for (final Button button : actionButtons) {
-            button.render(context, mouseX, mouseY, partialTick);
+        pose(context).popPose();
+
+        for (final var button : actionButtons) {
+            //#if MC >= 1.21.4
+            button.button.setPosition(
+                button.baseX - (scrollbarVisible() ? 10 : 0),
+                button.baseY - (int)scrollAmount()
+            );
+            //#endif
+            button.button.render(context, mouseX, mouseY, partialTick);
         }
+
+        //#if MC >= 1.21.4
+        context.disableScissor();
+        renderScrollbar(context);
+        //#endif
     }
 
     //#if MC >= 1.19.4
@@ -169,13 +193,14 @@ private void addButtons(int fromI) {
             final UserInfo user = users.get(i);
             int x = getRight() - 24 * user.actions.size() + 4;
             for (final Action action : user.actions) {
-                actionButtons.add(
-                    WorldHostScreen.button(action.text, b -> action.apply.run())
+                actionButtons.add(new ActionButtonWrapper(
+                    button(action.text, b -> action.apply.run())
                         .tooltip(action.tooltip)
                         .pos(x, y)
                         .size(20, 20)
-                        .build()
-                );
+                        .build(),
+                    x, y
+                ));
                 x += 24;
             }
             y += 24;
@@ -183,13 +208,29 @@ private void addButtons(int fromI) {
     }
 
     public int getVisibleCount() {
-        return Math.min(users.size(), getHeight() / 24);
+        //#if MC >= 1.21.4
+        return users.size();
+        //#else
+        //$$ return Math.min(users.size(), getHeight() / 24);
+        //#endif
     }
 
     @Override
     public @NotNull List<? extends GuiEventListener> children() {
-        return actionButtons;
+        return children;
+    }
+
+    //#if MC >= 1.21.4
+    @Override
+    protected int contentHeight() {
+        return 24 * users.size();
+    }
+
+    @Override
+    protected double scrollRate() {
+        return 12.0;
     }
+    //#endif
 
     //#if MC < 1.19.4
     //$$ private int getX() {
@@ -296,4 +337,7 @@ public Action(Component text, Runnable apply) {
             this(text, null, apply);
         }
     }
+
+    public record ActionButtonWrapper(Button button, int baseX, int baseY) {
+    }
 }
diff --git a/src/main/java/io/github/gaming32/worldhost/protocol/ProtocolClient.java b/src/main/java/io/github/gaming32/worldhost/protocol/ProtocolClient.java
index c1838bd..291b208 100644
--- a/src/main/java/io/github/gaming32/worldhost/protocol/ProtocolClient.java
+++ b/src/main/java/io/github/gaming32/worldhost/protocol/ProtocolClient.java
@@ -16,7 +16,6 @@
 import net.minecraft.util.Crypt;
 import net.minecraft.util.CryptException;
 import org.apache.commons.io.input.BoundedInputStream;
-import org.apache.commons.io.input.CountingInputStream;
 import org.jetbrains.annotations.Nullable;
 
 import javax.crypto.Cipher;
@@ -40,12 +39,16 @@
 import java.util.concurrent.Future;
 import java.util.concurrent.LinkedBlockingQueue;
 
+//#if MC >= 1.20.2
+import com.mojang.authlib.exceptions.ForcedUsernameChangeException;
+//#endif
+
 //#if MC < 1.20.4
 //$$ import com.mojang.authlib.GameProfile;
 //#endif
 
-//#if MC >= 1.20.2
-import com.mojang.authlib.exceptions.ForcedUsernameChangeException;
+//#if MC < 1.21.4
+//$$ import org.apache.commons.io.input.CountingInputStream;
 //#endif
 
 public final class ProtocolClient implements AutoCloseable, ProxyPassthrough {
@@ -164,23 +167,31 @@ public ProtocolClient(String host, boolean successToast, boolean failureToast) {
                             continue;
                         }
                         final int typeId = dis.readUnsignedByte();
-                        final BoundedInputStream bis = new BoundedInputStream(dis, length);
-                        bis.setPropagateClose(false);
-                        final var cis = new CountingInputStream(bis);
+                        //#if MC >= 1.21.4
+                        final var is = BoundedInputStream.builder()
+                            .setInputStream(dis)
+                            .setPropagateClose(false)
+                            .setMaxCount(length)
+                            .get();
+                        //#else
+                        //$$ final BoundedInputStream bis = new BoundedInputStream(dis, length);
+                        //$$ bis.setPropagateClose(false);
+                        //$$ final var is = new CountingInputStream(bis); // TODO: Remove when 1.20.2+ becomes the minimum
+                        //#endif
                         WorldHostS2CMessage message = null;
                         try {
-                            message = WorldHostS2CMessage.decode(typeId, new DataInputStream(cis));
+                            message = WorldHostS2CMessage.decode(typeId, new DataInputStream(is));
                         } catch (EOFException e) {
                             WorldHost.LOGGER.error("Message decoder for message {} read past end (length {})!", typeId, length);
                         } catch (Exception e) {
                             WorldHost.LOGGER.error("Error decoding WH message", e);
                         }
-                        if (cis.getCount() < length) {
+                        if (is.getCount() < length) {
                             WorldHost.LOGGER.warn(
                                 "Didn't read entire message (read: {}, total: {}, message: {})",
-                                cis.getCount(), length, message
+                                is.getCount(), length, message
                             );
-                            dis.skipNBytes(length - cis.getCount());
+                            dis.skipNBytes(length - is.getCount()); // TODO: getRemaining when 1.21.4+ becomes the minimum
                         }
                         if (message == null) continue; // An error occurred!
                         WorldHost.LOGGER.debug("Received {}", message);
diff --git a/src/main/resources/META-INF/neoforge.mods.toml b/src/main/resources/META-INF/neoforge.mods.toml
index b5c8008..5f16366 100644
--- a/src/main/resources/META-INF/neoforge.mods.toml
+++ b/src/main/resources/META-INF/neoforge.mods.toml
@@ -31,9 +31,9 @@ modId = "minecraft"
 ##elseif MC == 1.21.1
 #?? versionRange = "[1.21.0,1.21.2)"
 ##elseif MC == 1.21.3
-versionRange = "[1.21.2,1.21.4)"
+#?? versionRange = "[1.21.2,1.21.4)"
 ##else
-#?? versionRange = "[$mc_version]"
+versionRange = "[$mc_version]"
 ##endif
 type = "required"
 ordering = "NONE"
diff --git a/src/main/resources/fabric.mod.json b/src/main/resources/fabric.mod.json
index 5166f31..a3ad8ac 100644
--- a/src/main/resources/fabric.mod.json
+++ b/src/main/resources/fabric.mod.json
@@ -45,9 +45,9 @@
     //#elseif MC == 1.21.1
     //?? "minecraft": ">=1.21.0 <1.21.2",
     //#elseif MC == 1.21.3
-    "minecraft": ">=1.21.2 <1.21.4",
+    //?? "minecraft": ">=1.21.2 <1.21.4",
     //#else
-    //?? "minecraft": "$mc_version",
+    "minecraft": "$mc_version",
     //#endif
     "fabric-resource-loader-v0": "*"
   },
diff --git a/version.gradle.kts b/version.gradle.kts
index dc56385..359c27c 100644
--- a/version.gradle.kts
+++ b/version.gradle.kts
@@ -164,7 +164,7 @@ dependencies {
     })
 
     when {
-        isFabric -> modImplementation("net.fabricmc:fabric-loader:0.16.7")
+        isFabric -> modImplementation("net.fabricmc:fabric-loader:0.16.9")
         isForge ->
             when (mcVersion) {
                 1_20_01 -> "47.1.3"
@@ -174,6 +174,7 @@ dependencies {
             }.let { "forge"("net.minecraftforge:forge:$mcVersionString-$it") }
         isNeoForge ->
             when (mcVersion) {
+                1_21_04 -> "21.4.1-beta"
                 1_21_03 -> "21.3.56"
                 1_21_01 -> "21.1.1"
                 1_20_06 -> "20.6.115"
@@ -189,6 +190,7 @@ dependencies {
 
     if (isFabric) {
         when (mcVersion) {
+            1_21_04 -> "12.0.0-beta.1" // TODO: Use actual version
             1_21_03 -> "12.0.0-beta.1"
             1_21_01 -> "11.0.1"
             1_20_06 -> "10.0.0"
@@ -211,6 +213,7 @@ dependencies {
 
     if (isFabric) {
         when (mcVersion) {
+            1_21_04 -> "0.110.5+1.21.4"
             1_21_03 -> "0.106.1+1.21.3"
             1_21_01 -> "0.102.0+1.21.1"
             1_20_06 -> "0.100.0+1.20.6"
@@ -247,6 +250,7 @@ dependencies {
 
     compileOnly("de.maxhenkel.voicechat:voicechat-api:2.5.0")
     when (mcVersion) {
+        1_21_04 -> "2.5.26"
         1_21_03 -> "2.5.24"
         1_21_01 -> "2.5.20"
         1_20_06 -> "2.5.20"
@@ -330,6 +334,7 @@ tasks.processResources {
     // TODO: Remove pack.mcmeta in 1.20.4
     filesMatching("pack.mcmeta") {
         expand("pack_format" to when {
+            mcVersion >= 1_21_04 -> 61
             mcVersion >= 1_21_02 -> 42
             mcVersion >= 1_21_00 -> 34
             mcVersion >= 1_20_05 -> 32
diff --git a/versions/mainProject b/versions/mainProject
index 71a33c8..940b501 100644
--- a/versions/mainProject
+++ b/versions/mainProject
@@ -1 +1 @@
-1.21.3-fabric
\ No newline at end of file
+1.21.4-fabric
\ No newline at end of file