diff --git a/.idea/compiler.xml b/.idea/compiler.xml
index 61a9130..ac216bc 100644
--- a/.idea/compiler.xml
+++ b/.idea/compiler.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="CompilerConfiguration">
-    <bytecodeTargetLevel target="1.8" />
+    <bytecodeTargetLevel target="14" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 91886a8..83b37b5 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -8,8 +8,6 @@
         <option name="testRunner" value="GRADLE" />
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="gradleHome" value="/usr/share/java/gradle" />
-        <option name="gradleJvm" value="13" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />
diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
index 37dc367..a648411 100644
--- a/.idea/jarRepositories.xml
+++ b/.idea/jarRepositories.xml
@@ -26,5 +26,10 @@
       <option name="name" value="maven" />
       <option name="url" value="https://oss.sonatype.org/content/repositories/snapshots/" />
     </remote-repository>
+    <remote-repository>
+      <option name="id" value="maven2" />
+      <option name="name" value="maven2" />
+      <option name="url" value="https://jitpack.io" />
+    </remote-repository>
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 3520b9e..9fd3e9a 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -12,7 +12,7 @@
   <component name="JavaScriptSettings">
     <option name="languageLevel" value="ES6" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_13" default="false" project-jdk-name="14" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_14" default="true" project-jdk-name="14" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index 4a0d4e8..a20d673 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,16 +7,16 @@ plugins {
 group 'org.kraftwerk28'
 version '0.0.4-SNAPSHOT'
 
-def defaultOutDir = "$System.env.HOME/MinecraftServers/spigot_1.15.2/plugins/"
-rootProject.libsDirName = System.getenv("OUT_DIR") ?: defaultOutDir
-
-sourceCompatibility = 1.8
-targetCompatibility = 1.8
+//def defaultOutDir = "$System.env.HOME/MinecraftServers/spigot_1.15.2/plugins/"
+//rootProject.libsDirName = System.getenv("OUT_DIR") ?: defaultOutDir
 
 repositories {
     maven {
         url "https://hub.spigotmc.org/nexus/content/repositories/snapshots"
     }
+    maven {
+        url "https://jitpack.io"
+    }
     maven {
         url "https://oss.sonatype.org/content/repositories/snapshots/"
     }
@@ -25,11 +25,13 @@ repositories {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
-    testCompile group: 'junit', name: 'junit', version: '4.12'
+    testImplementation group: 'junit', name: 'junit', version: '4.12'
     compileOnly "org.spigotmc:spigot-api:1.15.2-R0.1-SNAPSHOT"
-    compile group: 'org.telegram', name: 'telegrambots', version: '4.6'
-    compile group: 'org.yaml', name: 'snakeyaml', version: '1.25'
-    compile 'com.vdurmont:emoji-java:5.1.1'
+    implementation group: 'org.telegram', name: 'telegrambots', version: '4.6'
+    implementation 'com.vdurmont:emoji-java:5.1.1'
+
+    def tgBotVer = '5.0.0'
+    implementation "io.github.kotlin-telegram-bot.kotlin-telegram-bot:telegram:$tgBotVer"
 }
 
 compileKotlin {
diff --git a/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Bot.kt b/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Bot.kt
index 6609d45..80d26b2 100644
--- a/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Bot.kt
+++ b/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Bot.kt
@@ -8,53 +8,54 @@ import org.telegram.telegrambots.meta.api.objects.Message
 import org.telegram.telegrambots.meta.api.objects.Update
 import org.telegram.telegrambots.meta.api.objects.User
 import org.telegram.telegrambots.meta.exceptions.TelegramApiException
+import org.kraftwerk28.spigot_tg_bridge.Constants as C
 
 class Bot(private var plugin: Plugin) : TelegramLongPollingBot() {
-
     private val allowedChats: List<Long>
     private val chatToMC: Boolean
     private val botToken: String
     private val botUsername: String
+    private val cmd = Commands(plugin)
+
     init {
         plugin.config.run {
-            allowedChats = getLongList("chats")
-            chatToMC = getBoolean("logFromTGtoMC", false)
-            botToken = getString("botToken") ?: throw Exception("Bot token must be defined.")
-            botUsername = getString("botUsername") ?: throw Exception("Bot username must be defined.")
+            allowedChats = getLongList(C.FIELDS.ALLOWED_CHATS)
+            chatToMC = getBoolean(C.FIELDS.LOG_FROM_TG_TO_MC, C.DEFS.logFromTGtoMC)
+            botToken = getString(C.FIELDS.BOT_TOKEN) ?: throw Exception(C.WARN.noToken)
+            botUsername = getString(C.FIELDS.BOT_USERNAME) ?: throw Exception(C.WARN.noUsername)
         }
     }
 
     override fun getBotToken() = botToken
-
     override fun getBotUsername() = botUsername
 
     override fun onUpdateReceived(update: Update?) {
         val msg = update?.message
-        plugin.logger.info("chat id: ${msg?.chatId}, message id: ${msg?.messageId}")
+        plugin.logger.info("Chat id: ${msg?.chatId}, Message id: ${msg?.messageId}.")
         if (msg == null || msg.text == null) return
         if (!allowedChats.contains(msg.chatId)) return
 
         // cmd shows online players
-        if (msg.text.startsWith("/online")) {
+        if (msg.text.startsWith(cmd.online)) {
             val playerList = plugin.server.onlinePlayers
             val playerStr = plugin.server
                 .onlinePlayers
                 .mapIndexed { i, s -> "${i + 1}. ${s.displayName}" }
                 .joinToString("\n")
             val onlineStr = plugin.config.getString(
-                "strings.online",
-                "Online"
+                C.FIELDS.STRINGS.ONLINE,
+                C.DEFS.playersOnline
             )!!
             val offlineStr = plugin.config.getString(
-                "strings.nobodyOnline",
-                "Nobody online"
+                C.FIELDS.STRINGS.OFFLINE,
+                C.DEFS.nobodyOnline
             )!!
             val text =
                 if (playerList.isNotEmpty()) "$onlineStr:\n$playerStr"
                 else offlineStr
             reply(msg, text) { it.replyToMessageId = msg.messageId }
         }
-        if (msg.text.startsWith("/time")) {
+        if (msg.text.startsWith(cmd.time)) {
             val t = plugin.server.worlds[0].time
             var text = when {
                 t <= 12000 -> "\uD83C\uDFDE Day"
@@ -66,6 +67,7 @@ class Bot(private var plugin: Plugin) : TelegramLongPollingBot() {
             text += " ($t)"
             reply(msg, text) { it.replyToMessageId = msg.messageId }
         }
+
         // stop, if no command matched:
         if (msg.text!!.startsWith("/")) return
 
@@ -110,14 +112,10 @@ class Bot(private var plugin: Plugin) : TelegramLongPollingBot() {
     }
 
     private fun mcMessageStr(username: String, text: String): String =
-        "<i>$username</i>: $text"
+        "<b>$username</b>: $text"
 
     private fun rawUserMention(user: User): String =
         (if (user.firstName.length < 2) null else user.firstName)
             ?: user.userName
             ?: user.lastName
-
-    private fun telegramUserMention(user: User): String =
-        if (user.userName != null) "@${user.userName}"
-        else "<a href=\"tg://user?id=${user.id}\">${user.firstName ?: user.lastName}</a>"
 }
diff --git a/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/BotCommands.kt b/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/BotCommands.kt
new file mode 100644
index 0000000..1ff346e
--- /dev/null
+++ b/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/BotCommands.kt
@@ -0,0 +1,20 @@
+package org.kraftwerk28.spigot_tg_bridge
+
+import org.kraftwerk28.spigot_tg_bridge.Constants as C
+
+class Commands(plugin: Plugin) {
+    val time: String
+    val online: String
+    init {
+        plugin.config.run {
+            time = getString(
+                C.FIELDS.COMMANDS.TIME,
+                C.DEFS.COMMANDS.TIME
+            )!!
+            online = getString(
+                C.FIELDS.COMMANDS.ONLINE,
+                C.DEFS.COMMANDS.ONLINE
+            )!!
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Constants.kt b/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Constants.kt
new file mode 100644
index 0000000..a3cf583
--- /dev/null
+++ b/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Constants.kt
@@ -0,0 +1,44 @@
+package org.kraftwerk28.spigot_tg_bridge
+
+object Constants {
+    val configFilename = "config.yml"
+    // Config field names
+    object FIELDS {
+        val BOT_TOKEN = "botToken"
+        val BOT_USERNAME = "botUsername"
+        val ALLOWED_CHATS = "chats"
+        val LOG_FROM_MC_TO_TG = "logFromMCtoTG"
+        val LOG_FROM_TG_TO_MC = "logFromTGtoMC"
+        val SERVER_START_MSG = "serverStartMessage"
+        val SERVER_STOP_MSG = "serverStopMessage"
+        val LOG_JOIN_LEAVE = "logJoinLeave"
+        object STRINGS {
+            val ONLINE = "strings.online"
+            val OFFLINE = "strings.offline"
+            val JOINED = "strings.joined"
+            val LEFT = "strings.left"
+        }
+        object COMMANDS {
+            val TIME = "commands.time"
+            val ONLINE = "commands.online"
+        }
+    }
+    object DEFS {
+        val logFromMCtoTG = false
+        val logFromTGtoMC = false
+        val logJoinLeave = false
+        object COMMANDS {
+            val TIME = "/time"
+            val ONLINE = "/online"
+        }
+        val playersOnline = "Online"
+        val nobodyOnline = "Nobody online"
+        val playerJoined = "joined"
+        val playerLeft = "left"
+    }
+    object WARN {
+        val noConfigWarning = "No config file found! Writing default config to config.yml."
+        val noToken = "Bot token must be defined."
+        val noUsername = "Bot username must be defined."
+    }
+}
diff --git a/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/EventHandler.kt b/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/EventHandler.kt
index 0cd0184..fc234d7 100644
--- a/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/EventHandler.kt
+++ b/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/EventHandler.kt
@@ -5,6 +5,7 @@ import org.bukkit.event.Listener
 import org.bukkit.event.player.AsyncPlayerChatEvent
 import org.bukkit.event.player.PlayerJoinEvent
 import org.bukkit.event.player.PlayerQuitEvent
+import org.kraftwerk28.spigot_tg_bridge.Constants as C
 
 class EventHandler(private val plugin: Plugin) : Listener {
 
@@ -14,9 +15,9 @@ class EventHandler(private val plugin: Plugin) : Listener {
 
     init {
         plugin.config.run {
-            joinStr = getString("strings.joined", "joined")!!
-            leftStr = getString("strings.left", "left")!!
-            logJoinLeave = getBoolean("logJoinLeave", false)
+            joinStr = getString(C.FIELDS.STRINGS.JOINED, C.DEFS.playerJoined)!!
+            leftStr = getString(C.FIELDS.STRINGS.LEFT, C.DEFS.playerLeft)!!
+            logJoinLeave = getBoolean(C.FIELDS.LOG_JOIN_LEAVE, C.DEFS.logJoinLeave)
         }
     }
 
@@ -24,7 +25,7 @@ class EventHandler(private val plugin: Plugin) : Listener {
     fun onPlayerChat(event: AsyncPlayerChatEvent) {
         if (plugin.chatToTG) {
             plugin.tgBot?.sendMessageToTGFrom(
-                event.player.displayName, event.message
+                escapeHTML(event.player.displayName), event.message
             )
         }
     }
@@ -32,16 +33,14 @@ class EventHandler(private val plugin: Plugin) : Listener {
     @EventHandler
     fun onPlayerJoin(event: PlayerJoinEvent) {
         if (!logJoinLeave) return
-        plugin.tgBot?.broadcastToTG(
-            "<b>${event.player.displayName}</b> $joinStr."
-        )
+        val text = "<b>${escapeHTML(event.player.displayName)}</b> $joinStr."
+        plugin.tgBot?.broadcastToTG(text)
     }
 
     @EventHandler
     fun onPlayerLeave(event: PlayerQuitEvent) {
         if (!logJoinLeave) return
-        plugin.tgBot?.broadcastToTG(
-            "<b>${event.player.displayName}</b> b $leftStr."
-        )
+        val text = "<b>${escapeHTML(event.player.displayName)}</b> $leftStr."
+        plugin.tgBot?.broadcastToTG(text)
     }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Plugin.kt b/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Plugin.kt
index 199489d..dc04359 100644
--- a/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Plugin.kt
+++ b/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Plugin.kt
@@ -1,11 +1,11 @@
 package org.kraftwerk28.spigot_tg_bridge
 
 import com.vdurmont.emoji.EmojiParser
-import org.bukkit.event.Listener
 import org.bukkit.plugin.java.JavaPlugin
 import org.telegram.telegrambots.ApiContextInitializer
 import org.telegram.telegrambots.meta.TelegramBotsApi
 import java.io.File
+import org.kraftwerk28.spigot_tg_bridge.Constants as C
 
 class Plugin : JavaPlugin() {
 
@@ -14,17 +14,20 @@ class Plugin : JavaPlugin() {
 
     init {
         config.run {
-            chatToTG = getBoolean("logFromMCtoTG", false)
+            chatToTG = getBoolean(
+                C.FIELDS.LOG_FROM_MC_TO_TG,
+                C.DEFS.logFromMCtoTG
+            )
         }
     }
 
     override fun onEnable() {
         val configFile = File(
             server.pluginManager.getPlugin(name)!!.dataFolder,
-            "config.yml"
+            C.configFilename
         )
         if (!configFile.exists()) {
-            logger.warning("No config file found! Saving default one.")
+            logger.warning(C.WARN.noConfigWarning)
             saveDefaultConfig()
             return
         }
@@ -38,15 +41,19 @@ class Plugin : JavaPlugin() {
         server.pluginManager.registerEvents(EventHandler(this), this)
 
         // Notify everything about server start
-        val startMsg = config.getString("serverStartMessage", null)
-        if (startMsg != null) tgBot?.broadcastToTG(startMsg)
-        logger.info("Plugin started")
+        config.getString(C.FIELDS.SERVER_START_MSG, null)?.let {
+            logger.info("Server start message: $it")
+            tgBot?.broadcastToTG(it)
+        }
+        logger.info("Plugin started.")
     }
 
     override fun onDisable() {
-        val stopMsg = config.getString("serverStopMessage", null)
-        if (stopMsg != null) tgBot?.broadcastToTG(stopMsg)
-        logger.info("Plugin stopped")
+        config.getString(C.FIELDS.SERVER_STOP_MSG, null)?.let {
+            logger.info("Server stop message: $it")
+            tgBot?.broadcastToTG(it)
+        }
+        logger.info("Plugin stopped.")
     }
 
     fun sendMessageToMC(text: String) {
@@ -55,7 +62,10 @@ class Plugin : JavaPlugin() {
     }
 
     fun sendMessageToMCFrom(username: String, text: String) {
-        val prep = EmojiParser.parseToAliases("<$username> $text")
-        server.broadcastMessage(prep)
+        val text = run {
+            val text = "<${escapeHTML(username)}> $text"
+            EmojiParser.parseToAliases(text)
+        }
+        server.broadcastMessage(text)
     }
 }
diff --git a/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Utils.kt b/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Utils.kt
new file mode 100644
index 0000000..af40d27
--- /dev/null
+++ b/src/main/kotlin/org/kraftwerk28/spigot_tg_bridge/Utils.kt
@@ -0,0 +1,10 @@
+package org.kraftwerk28.spigot_tg_bridge
+
+import org.telegram.telegrambots.meta.api.objects.User
+
+fun escapeHTML(s: String): String =
+    s.replace("&", "&amp;").replace(">", "&gt;").replace("<", "&lt;")
+
+fun telegramUserMention(user: User): String =
+    if (user.userName != null) "@${user.userName}"
+    else "<a href=\"tg://user?id=${user.id}\">${user.firstName ?: user.lastName}</a>"
diff --git a/src/main/resources/config.yml b/src/main/resources/config.yml
index de39637..30d22b9 100644
--- a/src/main/resources/config.yml
+++ b/src/main/resources/config.yml
@@ -12,3 +12,4 @@ strings:
   nobodyOnline: '<b>Nobody online...</b>'
   joined: 'joined'
   left: 'left'
+
diff --git a/src/main/resources/plugin.yml b/src/main/resources/plugin.yml
index 5329f7f..cd42a1d 100644
--- a/src/main/resources/plugin.yml
+++ b/src/main/resources/plugin.yml
@@ -1,5 +1,5 @@
 name: SpigotTGBridge
-version: 0.0.5
+version: 0.0.6
 api-version: '1.15'
 main: org.kraftwerk28.spigot_tg_bridge.Plugin
 description: Telegram <-> Minecraft communication plugin for Spigot.