diff --git a/CHANGELOG.md b/CHANGELOG.md
index 23c6e41153..aa0123b088 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # TelegramBotAPI changelog
 
+## 4.1.1
+
+* `Core`:
+  * Add opportunity to create `IdChatIdentifier` with optional `threadId`
+  * New serializer `FullChatIdentifierSerializer` with serialization of `ChatIdWithThreadId`
+
 ## 4.1.0
 
 * `Versions`:
diff --git a/gradle.properties b/gradle.properties
index 12f8e88ed4..8c6bfddbee 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -6,4 +6,4 @@ kotlin.incremental=true
 kotlin.incremental.js=true
 
 library_group=dev.inmo
-library_version=4.1.0
+library_version=4.1.1
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/ChatIdentifier.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/ChatIdentifier.kt
index 42805b6d75..0f81141a77 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/ChatIdentifier.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/ChatIdentifier.kt
@@ -30,6 +30,9 @@ sealed interface IdChatIdentifier : ChatIdentifier {
 
     companion object {
         operator fun invoke(chatId: Identifier) = ChatId(chatId)
+        operator fun invoke(chatId: Identifier, threadId: MessageThreadId?) = threadId ?.let {
+            ChatIdWithThreadId(chatId, threadId)
+        } ?: ChatId(chatId)
     }
 }
 
@@ -94,6 +97,7 @@ object ChatIdentifierSerializer : KSerializer<ChatIdentifier> {
     override val descriptor: SerialDescriptor = internalSerializer.descriptor
     override fun deserialize(decoder: Decoder): ChatIdentifier {
         val id = internalSerializer.deserialize(decoder)
+
         return id.longOrNull ?.let {
             ChatId(it)
         } ?: id.content.let {
@@ -112,3 +116,41 @@ object ChatIdentifierSerializer : KSerializer<ChatIdentifier> {
         }
     }
 }
+
+@RiskFeature
+object FullChatIdentifierSerializer : KSerializer<ChatIdentifier> {
+    private val internalSerializer = JsonPrimitive.serializer()
+    override val descriptor: SerialDescriptor = internalSerializer.descriptor
+    override fun deserialize(decoder: Decoder): ChatIdentifier {
+        val id = internalSerializer.deserialize(decoder)
+
+        return id.longOrNull ?.let {
+            ChatId(it)
+        } ?:let {
+            val splitted = id.content.split("/")
+            if (splitted.size == 2) {
+                val (chatId, threadId) = splitted
+                ChatIdWithThreadId(
+                    chatId.toLongOrNull() ?: return@let null,
+                    threadId.toLongOrNull() ?: return@let null
+                )
+            } else {
+                null
+            }
+        } ?: id.content.let {
+            if (!it.startsWith("@")) {
+                Username("@$it")
+            } else {
+                Username(it)
+            }
+        }
+    }
+
+    override fun serialize(encoder: Encoder, value: ChatIdentifier) {
+        when (value) {
+            is ChatId -> encoder.encodeLong(value.chatId)
+            is ChatIdWithThreadId -> encoder.encodeString("${value.chatId}/${value.threadId}")
+            is Username -> encoder.encodeString(value.username)
+        }
+    }
+}