diff --git a/CHANGELOG.md b/CHANGELOG.md
index fdc4de935c..2a5b753e50 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## 3.2.6
 
+* `Core`:
+    * Fixes in `ChatMemberSerializer#serialize` method
+
 ## 3.2.5
 
 * `Common`:
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/member/ChatMember.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/member/ChatMember.kt
index 584606fe2f..112e078521 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/member/ChatMember.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/member/ChatMember.kt
@@ -34,12 +34,12 @@ object ChatMemberSerializer : KSerializer<ChatMember> {
 
     override fun serialize(encoder: Encoder, value: ChatMember) {
         when (value) {
-            is OwnerChatMember -> OwnerChatMember.serializer()
-            is AdministratorChatMemberImpl -> AdministratorChatMemberImpl.serializer()
-            is MemberChatMember -> MemberChatMemberImpl.serializer()
-            is RestrictedChatMember -> RestrictedChatMember.serializer()
-            is LeftChatMember -> LeftChatMemberImpl.serializer()
-            is KickedChatMember -> KickedChatMember.serializer()
+            is OwnerChatMember -> OwnerChatMember.serializer().serialize(encoder, value)
+            is AdministratorChatMemberImpl -> AdministratorChatMemberImpl.serializer().serialize(encoder, value)
+            is MemberChatMemberImpl -> MemberChatMemberImpl.serializer().serialize(encoder, value)
+            is RestrictedChatMember -> RestrictedChatMember.serializer().serialize(encoder, value)
+            is LeftChatMemberImpl -> LeftChatMemberImpl.serializer().serialize(encoder, value)
+            is KickedChatMember -> KickedChatMember.serializer().serialize(encoder, value)
         }
     }
 }