diff --git a/CHANGELOG.md b/CHANGELOG.md
index 83399a485f..2b841162b0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,8 +7,6 @@
   * `Serialization`: `1.6.0` -> `1.6.1`
   * `Ktor`: `2.3.5` -> `2.3.6`
   * `MicroUtils`: `0.20.12` -> `0.20.15`
-* `Core`:
-  * New abstraction `ExtendedOtherPartiesChat` with `pinnedMessage`
 
 ## 9.3.0
 
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/Extended.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/Extended.kt
index 65256cb987..91d502f931 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/Extended.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/Extended.kt
@@ -81,10 +81,7 @@ data class ExtendedPrivateChatImpl(
     @SerialName(emojiStatusCustomEmojiIdField)
     override val statusEmojiId: CustomEmojiId? = null,
     @SerialName(emojiStatusExpirationDateField)
-    override val statusEmojiExpiration: TelegramDate? = null,
-    @SerialName(pinnedMessageField)
-    @Serializable(TelegramBotAPIMessageDeserializeOnlySerializer::class)
-    override val pinnedMessage: Message? = null,
+    override val statusEmojiExpiration: TelegramDate? = null
 ) : ExtendedPrivateChat
 
 typealias ExtendedUser = ExtendedPrivateChatImpl
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/ExtendedAbstracts.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/ExtendedAbstracts.kt
index bf9e7cc122..09ac9d6f4f 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/ExtendedAbstracts.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/ExtendedAbstracts.kt
@@ -17,7 +17,7 @@ sealed interface ExtendedGroupChat : GroupChat, ExtendedPublicChat {
 }
 
 @Serializable(ExtendedChatSerializer.Companion::class)
-sealed interface ExtendedPrivateChat : PrivateChat, ExtendedChatWithUsername, ExtendedOtherPartiesChat {
+sealed interface ExtendedPrivateChat : PrivateChat, ExtendedChatWithUsername {
     val bio: String
     val hasPrivateForwards: Boolean
     val hasRestrictedVoiceAndVideoMessages: Boolean
@@ -28,9 +28,11 @@ sealed interface ExtendedPrivateChat : PrivateChat, ExtendedChatWithUsername, Ex
         get() = hasPrivateForwards
 }
 
-sealed interface ExtendedPublicChat : ExtendedOtherPartiesChat, PublicChat {
+sealed interface ExtendedPublicChat : ExtendedChat, PublicChat {
     val description: String
     val inviteLink: String?
+    @Serializable(TelegramBotAPIMessageDeserializeOnlySerializer::class)
+    val pinnedMessage: Message?
     val membersHidden: Boolean
 }
 
@@ -66,13 +68,6 @@ sealed interface ExtendedChat : Chat {
     val chatPhoto: ChatPhoto?
 }
 
-
-@Serializable(ExtendedChatSerializer.Companion::class)
-sealed interface ExtendedOtherPartiesChat : ExtendedChat {
-    @Serializable(TelegramBotAPIMessageDeserializeOnlySerializer::class)
-    val pinnedMessage: Message?
-}
-
 @Serializable(ExtendedChatSerializer.Companion::class)
 sealed interface ExtendedChatWithUsername : UsernameChat, ExtendedChat {
     val activeUsernames: List<Username>
diff --git a/tgbotapi.utils/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/utils/ClassCastsNew.kt b/tgbotapi.utils/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/utils/ClassCastsNew.kt
index 234934b60c..5dadba2ded 100644
--- a/tgbotapi.utils/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/utils/ClassCastsNew.kt
+++ b/tgbotapi.utils/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/utils/ClassCastsNew.kt
@@ -120,7 +120,6 @@ import dev.inmo.tgbotapi.types.chat.ExtendedChat
 import dev.inmo.tgbotapi.types.chat.ExtendedChatWithUsername
 import dev.inmo.tgbotapi.types.chat.ExtendedForumChat
 import dev.inmo.tgbotapi.types.chat.ExtendedGroupChat
-import dev.inmo.tgbotapi.types.chat.ExtendedOtherPartiesChat
 import dev.inmo.tgbotapi.types.chat.ExtendedPrivateChat
 import dev.inmo.tgbotapi.types.chat.ExtendedPublicChat
 import dev.inmo.tgbotapi.types.chat.ExtendedSupergroupChat
@@ -1966,15 +1965,6 @@ public inline fun Chat.extendedChatOrThrow(): ExtendedChat = this as
 public inline fun <T> Chat.ifExtendedChat(block: (ExtendedChat) -> T): T? = extendedChatOrNull()
     ?.let(block)
 
-public inline fun Chat.extendedOtherPartiesChatOrNull(): ExtendedOtherPartiesChat? = this as?
-    dev.inmo.tgbotapi.types.chat.ExtendedOtherPartiesChat
-
-public inline fun Chat.extendedOtherPartiesChatOrThrow(): ExtendedOtherPartiesChat = this as
-    dev.inmo.tgbotapi.types.chat.ExtendedOtherPartiesChat
-
-public inline fun <T> Chat.ifExtendedOtherPartiesChat(block: (ExtendedOtherPartiesChat) -> T): T? =
-    extendedOtherPartiesChatOrNull() ?.let(block)
-
 public inline fun Chat.extendedChatWithUsernameOrNull(): ExtendedChatWithUsername? = this as?
     dev.inmo.tgbotapi.types.chat.ExtendedChatWithUsername