diff --git a/.gitignore b/.gitignore
index 8a67d8e..64158ce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@ classes/
 # eclipse
 
 *.launch
+.factorypath
 
 # idea
 
@@ -42,3 +43,7 @@ replay_*.log
 # node
 
 node_modules/
+
+# scripts
+
+build.sh
diff --git a/dependencies.gradle b/dependencies.gradle
index 2e6c2fa..423a680 100644
--- a/dependencies.gradle
+++ b/dependencies.gradle
@@ -2,9 +2,9 @@
 ext {
     // Fabric Properties
     // check these on https://fabricmc.net/develop
-    minecraft_version = '1.21.8'
-    yarn_mappings = '1.21.8+build.1'
-    loader_version = '0.16.14'
+    minecraft_version = '1.21.9'
+    yarn_mappings = '1.21.9+build.1'
+    loader_version = '0.17.2'
 
     // Mod Properties
     mod_version = '1.4.0'
@@ -12,9 +12,9 @@ ext {
     archives_base_name = 'web-chat'
 
     // Dependencies
-    fabric_version = '0.129.0+1.21.8'
-    yacl_version = '3.7.1+1.21.6-fabric'
-    mod_menu_version = '11.0.3'
+    fabric_version = '0.134.0+1.21.9'
+    yacl_version = '3.8.0+1.21.9-fabric'
+    mod_menu_version = '16.0.0-rc.1'
 
     // Generic java dependencies
     javalin_version = '6.7.0'
diff --git a/src/client/java/dev/creesch/WebchatClient.java b/src/client/java/dev/creesch/WebchatClient.java
index 1262966..4872da9 100644
--- a/src/client/java/dev/creesch/WebchatClient.java
+++ b/src/client/java/dev/creesch/WebchatClient.java
@@ -6,6 +6,7 @@
 import dev.creesch.storage.ChatMessageRepository;
 import dev.creesch.util.NamedLogger;
 import java.net.URI;
+import java.util.concurrent.atomic.AtomicBoolean;
 import net.fabricmc.api.ClientModInitializer;
 import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents;
 import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents;
@@ -25,6 +26,7 @@ public class WebchatClient implements ClientModInitializer {
     private int tickCounter = 0;
     private static WebchatClient INSTANCE;
     private static String MOD_VERSION = "unknown";
+    private static AtomicBoolean hasJoined = new AtomicBoolean(false);
 
     @Override
     public void onInitializeClient() {
@@ -57,7 +59,7 @@ public void onInitializeClient() {
 
                 boolean fromSelf = sender == null
                     ? false
-                    : sender.getName().equals(selfName);
+                    : sender.name().equals(selfName);
                 try {
                     WebsocketJsonMessage chatMessage =
                         WebsocketMessageBuilder.createLiveChatMessage(
@@ -120,12 +122,21 @@ public void onInitializeClient() {
                     WebsocketMessageBuilder.createPlayerList(client)
                 );
 
+                boolean wasJoined = hasJoined.getAndSet(true);
+                if (wasJoined) {
+                    // JOIN event can occur multiple times per server connection.
+                    // Ensure the web address is only shown once per connection.
+                    return;
+                }
+
                 showWebAddress(client);
             });
         });
 
         // Send state to client
         ClientPlayConnectionEvents.DISCONNECT.register((handler, client) -> {
+            hasJoined.set(false);
+
             webInterface.broadcastMessage(
                 WebsocketMessageBuilder.createConnectionStateMessage(
                     WebsocketJsonMessage.ServerConnectionStates.DISCONNECT
diff --git a/src/client/java/dev/creesch/model/WebsocketMessageBuilder.java b/src/client/java/dev/creesch/model/WebsocketMessageBuilder.java
index 1f52cc7..0b07c7f 100644
--- a/src/client/java/dev/creesch/model/WebsocketMessageBuilder.java
+++ b/src/client/java/dev/creesch/model/WebsocketMessageBuilder.java
@@ -288,7 +288,7 @@ public static WebsocketJsonMessage createHistoryMetaDataMessage(
         Pattern.compile("^https?://textures\\.minecraft\\.net/texture/.+");
 
     private static String getPlayerTextureUrl(GameProfile profile) {
-        Collection<Property> textures = profile.getProperties().get("textures");
+        Collection<Property> textures = profile.properties().get("textures");
         if (textures.isEmpty()) {
             return "unknown";
         }
@@ -332,7 +332,7 @@ private static String getPlayerTextureUrl(GameProfile profile) {
             } catch (Exception e) {
                 LOGGER.error(
                     "Error decoding skin texture for player {}",
-                    profile.getName(),
+                    profile.name(),
                     e
                 );
             }
@@ -360,8 +360,8 @@ public static WebsocketJsonMessage createPlayerList(
             .getPlayerList()
             .forEach(player -> {
                 GameProfile profile = player.getProfile(); // Contains UUID and name
-                String playerId = profile.getId().toString();
-                String playerName = profile.getName();
+                String playerId = profile.id().toString();
+                String playerName = profile.name();
 
                 Text playerDisplayName = player.getDisplayName() != null
                     ? player.getDisplayName()
diff --git a/src/main/resources/fabric.mod.json b/src/main/resources/fabric.mod.json
index 08a5868..26349ce 100644
--- a/src/main/resources/fabric.mod.json
+++ b/src/main/resources/fabric.mod.json
@@ -20,13 +20,13 @@
         "modmenu": ["dev.creesch.config.ModMenuIntegration"]
     },
     "depends": {
-        "fabricloader": ">=0.16.14",
-        "minecraft": "~1.21.8",
+        "fabricloader": ">=0.17.2",
+        "minecraft": "~1.21.9",
         "java": ">=21",
         "fabric-api": "*",
-        "yet_another_config_lib_v3": ">=3.7.1+1.21.6-fabric"
+        "yet_another_config_lib_v3": ">=3.8.0+1.21.9-fabric"
     },
     "recommends": {
-        "modmenu": ">=11.0.3"
+        "modmenu": ">=16.0.0-rc.1"
     }
 }