diff --git a/CHANGELOG.md b/CHANGELOG.md
index 422c41c83b..201d25293a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## 5.1.0
 
+* `Core`:
+  * [Bot API 6.5](https://core.telegram.org/bots/api#february-3-2023) support
+    * Added the field `user_chat_id` to the class `ChatJoinRequest`.
+
 ## 5.0.2
 
 * `Versions`:
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/Common.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/Common.kt
index 8a3d8b8d85..b993b32d8b 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/Common.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/Common.kt
@@ -375,6 +375,7 @@ const val latitudeField = "latitude"
 const val longitudeField = "longitude"
 const val headingField = "heading"
 const val fromField = "from"
+const val userChatIdField = "user_chat_id"
 const val userField = "user"
 const val dateField = "date"
 const val chatField = "chat"
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/ChatJoinRequest.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/ChatJoinRequest.kt
index 738e95adc6..90a00b33f7 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/ChatJoinRequest.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/ChatJoinRequest.kt
@@ -15,6 +15,8 @@ data class ChatJoinRequest(
     val chat: PublicChat,
     @SerialName(fromField)
     override val from: User,
+    @SerialName(userChatIdField)
+    val userChatId: UserId,
     @SerialName(dateField)
     val date: TelegramDate,
     @SerialName(inviteLinkField)