diff --git a/build.gradle b/build.gradle
index 1c25f79..3dc6079 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ sourceCompatibility = targetCompatibility = JavaVersion.VERSION_1_8
 compileJava.options.encoding 'UTF-8'
 
 group 'me.dkim19375'
-version '2.0.2'
+version '2.0.3'
 
 compileKotlin.kotlinOptions.jvmTarget = '1.8'
 
diff --git a/src/main/java/me/dkim19375/dkim19375jdautils/BotBase.kt b/src/main/java/me/dkim19375/dkim19375jdautils/BotBase.kt
index 2e8647e..5f3b2f2 100644
--- a/src/main/java/me/dkim19375/dkim19375jdautils/BotBase.kt
+++ b/src/main/java/me/dkim19375/dkim19375jdautils/BotBase.kt
@@ -13,9 +13,9 @@ import kotlin.system.exitProcess
 
 @API
 abstract class BotBase(
-    val name: String,
-    @API val token: String,
-    val customListener: CustomListener = object : CustomListener() {}
+    open val name: String,
+    open val token: String,
+    open val customListener: CustomListener = object : CustomListener() {}
 ) {
     @API
     lateinit var jda: JDA
@@ -71,5 +71,5 @@ abstract class BotBase(
         }
     }
 
-    fun sendEvent(event: (Command) -> Unit) = commands.forEach(event)
+    open fun sendEvent(event: (Command) -> Unit) = commands.forEach(event)
 }
\ No newline at end of file
diff --git a/src/main/java/me/dkim19375/dkim19375jdautils/event/CustomListener.kt b/src/main/java/me/dkim19375/dkim19375jdautils/event/CustomListener.kt
index 7a98957..d7a9a6d 100644
--- a/src/main/java/me/dkim19375/dkim19375jdautils/event/CustomListener.kt
+++ b/src/main/java/me/dkim19375/dkim19375jdautils/event/CustomListener.kt
@@ -11,16 +11,16 @@ import net.dv8tion.jda.api.events.message.priv.PrivateMessageReceivedEvent
 
 abstract class CustomListener {
     @API
-    val antiBot: Boolean = true
+    open val antiBot: Boolean = true
 
     @API
-    fun onMessageReceived(event: MessageReceivedEvent): Boolean = true
+    open fun onMessageReceived(event: MessageReceivedEvent): Boolean = true
     @API
-    fun onGuildMessageReceived(event: GuildMessageReceivedEvent): Boolean = true
+    open fun onGuildMessageReceived(event: GuildMessageReceivedEvent): Boolean = true
     @API
-    fun onPrivateMessageReceived(event: PrivateMessageReceivedEvent): Boolean = true
+    open fun onPrivateMessageReceived(event: PrivateMessageReceivedEvent): Boolean = true
     @API
-    fun isValid(
+    open fun isValid(
         command: Command,
         cmd: String,
         args: List<String>,
@@ -65,7 +65,7 @@ abstract class CustomListener {
         }
         return true
     }
-    fun isValid(
+    open fun isValid(
         command: Command,
         cmd: String,
         args: List<String>,
@@ -73,7 +73,7 @@ abstract class CustomListener {
     ): Boolean =
         isValid(command, cmd, args, event.member, event.author, event.guild, event.message, event.channel, event)
 
-    fun isValid(
+    open fun isValid(
         command: Command,
         cmd: String,
         args: List<String>,
@@ -86,7 +86,7 @@ abstract class CustomListener {
         }, event.message, event.channel, event
     )
 
-    fun isValid(
+    open fun isValid(
         command: Command,
         cmd: String,
         args: List<String>,