diff --git a/MemberUpdatedWatcherBot/src/main/kotlin/MemberUpdatedWatcher.kt b/MemberUpdatedWatcherBot/src/main/kotlin/MemberUpdatedWatcher.kt
index 0480d2d..37a28e4 100644
--- a/MemberUpdatedWatcherBot/src/main/kotlin/MemberUpdatedWatcher.kt
+++ b/MemberUpdatedWatcherBot/src/main/kotlin/MemberUpdatedWatcher.kt
@@ -1,3 +1,4 @@
+import dev.inmo.kslog.common.*
 import dev.inmo.tgbotapi.extensions.api.*
 import dev.inmo.tgbotapi.extensions.api.bot.*
 import dev.inmo.tgbotapi.extensions.api.send.*
@@ -13,56 +14,72 @@ import dev.inmo.tgbotapi.utils.*
 suspend fun main(args: Array<String>) {
     val token = args.first()
 
+    val isDebug = args.any { it == "debug" }
+
+    if (isDebug) {
+        setDefaultKSLog(
+            KSLog { level: LogLevel, tag: String?, message: Any, throwable: Throwable? ->
+                println(defaultMessageFormatter(level, tag, message, throwable))
+            }
+        )
+    }
+
+    val internalLogger = KSLog { level: LogLevel, tag: String?, message: Any, throwable: Throwable? ->
+        println(defaultMessageFormatter(level, tag ?: "ChatMemberUpdates", message, throwable))
+    }
+
     val bot = telegramBot(token)
 
     bot.buildBehaviourWithLongPolling {
         val me = getMe()
         val filterSelfUpdates = SimpleFilter<ChatMemberUpdated> {
-            it.newChatMemberState.user.id == me.id
+            it.member.id == me.id
         }
 
+        // This bot updates
         onChatMemberJoined(initialFilter = filterSelfUpdates) {
-            println("Bot was added to chat")
+            internalLogger.i("Bot was added to chat")
             sendMessage(it.chat.id, "I was added to chat. Please grant me admin permissions to make me able to watch other users' events")
         }
 
         onChatMemberGotPromoted(initialFilter = filterSelfUpdates) {
-            println("Bot was granted admin permissions")
+            internalLogger.i("Bot was granted admin permissions")
             sendMessage(it.chat.id, "I was promoted to admin. I now can watch other users' events")
         }
 
         onChatMemberGotDemoted(initialFilter = filterSelfUpdates) {
-            println("Admin permissions were revoked")
+            internalLogger.i("Admin permissions were revoked")
             sendMessage(it.chat.id, "I'm no longer an admin. Admin permissions are required to watch other users' events")
         }
 
+        // All users updates
         onChatMemberJoined {
-            val member = it.newChatMemberState.user
-            println("${member.firstName} joined the chat: ${it.oldChatMemberState::class.simpleName} => ${it.newChatMemberState::class.simpleName}")
+            val member = it.member
+            internalLogger.i("${member.firstName} joined the chat: ${it.oldChatMemberState::class.simpleName} => ${it.newChatMemberState::class.simpleName}")
             sendMessage(it.chat.id, "Welcome ${member.firstName}")
         }
 
         onChatMemberLeft {
-            val member = it.newChatMemberState.user
-            println("${member.firstName} left the chat: ${it.oldChatMemberState::class.simpleName} => ${it.newChatMemberState::class.simpleName}")
+            val member = it.member
+            internalLogger.i("${member.firstName} left the chat: ${it.oldChatMemberState::class.simpleName} => ${it.newChatMemberState::class.simpleName}")
             sendMessage(it.chat.id, "Goodbye ${member.firstName}")
         }
 
         onChatMemberGotPromoted {
-            val newState = it.newChatMemberState.requireAdministratorChatMember()
-            println("${newState.user.firstName} got promoted to ${newState.customTitle ?: "Admin"}: ${it.oldChatMemberState::class.simpleName} => ${it.newChatMemberState::class.simpleName}")
+            val newState = it.newChatMemberState.administratorChatMemberOrThrow()
+            internalLogger.i("${newState.user.firstName} got promoted to ${newState.customTitle ?: "Admin"}: ${it.oldChatMemberState::class.simpleName} => ${it.newChatMemberState::class.simpleName}")
             sendMessage(it.chat.id, "${newState.user.firstName} is now an ${newState.customTitle ?: "Admin"}")
         }
 
         onChatMemberGotDemoted {
-            val member = it.newChatMemberState.user
-            println("${member.firstName} got demoted: ${it.oldChatMemberState::class.simpleName} => ${it.newChatMemberState::class.simpleName}")
+            val member = it.member
+            internalLogger.i("${member.firstName} got demoted: ${it.oldChatMemberState::class.simpleName} => ${it.newChatMemberState::class.simpleName}")
             sendMessage(it.chat.id, "${member.firstName} is now got demoted back to member")
         }
 
         onChatMemberGotPromotionChanged {
-            val member = it.newChatMemberState.requireAdministratorChatMember()
-            println("${member.user.firstName} has the permissions changed: ${it.oldChatMemberState::class.simpleName} => ${it.newChatMemberState::class.simpleName}")
+            val member = it.newChatMemberState.administratorChatMemberOrThrow()
+            internalLogger.i("${member.user.firstName} has the permissions changed: ${it.oldChatMemberState::class.simpleName} => ${it.newChatMemberState::class.simpleName}")
         }
     }.join()
 }
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