diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2a831fab41..eb90f1c7d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -42,6 +42,21 @@
         * `HttpClient#loadFile`
         * `PathedFile#download`
 
+### 0.28.4
+
+* `Common`:
+    * Version updates:
+        * `Ktor`: `1.4.0` -> `1.4.1`
+* `TelegramBotAPI-core`
+    * Interface `GroupEventMessage` has been added ([#140](https://github.com/InsanusMokrassar/TelegramBotAPI/pull/140))
+        * Old `GroupEventMessage` was renamed to `CommonGroupEventMessage` ([#140](https://github.com/InsanusMokrassar/TelegramBotAPI/pull/140))
+    * Interface `SupergroupEventMessage` has been added ([#140](https://github.com/InsanusMokrassar/TelegramBotAPI/pull/140))
+        * Old `SupergroupEventMessage` was renamed to `CommonSupergroupEventMessage` ([#140](https://github.com/InsanusMokrassar/TelegramBotAPI/pull/140))
+    * Any `GroupEventMessage` now have `from` field ([#140](https://github.com/InsanusMokrassar/TelegramBotAPI/pull/140))
+* `TelegramBotAPI-extensions-utils`
+    * Extensions `Flow<ChatEventMessage>#onlyGroupEvents` and `Flow<ChatEventMessage>#onlySupergroupEvents` now returns
+    `CommonGroupEventMessage` and `CommonSupergroupEventMessage`
+
 ### 0.28.3
 
 * Common:
diff --git a/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/GroupEventMessage.kt b/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/CommonGroupEventMessage.kt
similarity index 65%
rename from TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/GroupEventMessage.kt
rename to TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/CommonGroupEventMessage.kt
index c3b4340c52..eef3be7f87 100644
--- a/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/GroupEventMessage.kt
+++ b/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/CommonGroupEventMessage.kt
@@ -1,14 +1,19 @@
 package com.github.insanusmokrassar.TelegramBotAPI.types.message
 
 import com.github.insanusmokrassar.TelegramBotAPI.types.MessageIdentifier
+import com.github.insanusmokrassar.TelegramBotAPI.types.User
 import com.github.insanusmokrassar.TelegramBotAPI.types.chat.abstracts.GroupChat
 import com.github.insanusmokrassar.TelegramBotAPI.types.message.ChatEvents.abstracts.GroupEvent
-import com.github.insanusmokrassar.TelegramBotAPI.types.message.abstracts.ChatEventMessage
+import com.github.insanusmokrassar.TelegramBotAPI.types.message.abstracts.GroupEventMessage
 import com.soywiz.klock.DateTime
 
-data class GroupEventMessage(
+@Deprecated("Renamed", ReplaceWith("CommonGroupEventMessage"))
+typealias GroupEventMessage = CommonGroupEventMessage
+
+data class CommonGroupEventMessage(
     override val messageId: MessageIdentifier,
+    override val user: User,
     override val chat: GroupChat,
     override val chatEvent: GroupEvent,
     override val date: DateTime
-) : ChatEventMessage
+) : GroupEventMessage
diff --git a/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/SupergroupEventMessage.kt b/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/CommonSupergroupEventMessage.kt
similarity index 64%
rename from TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/SupergroupEventMessage.kt
rename to TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/CommonSupergroupEventMessage.kt
index 89229f1a5d..4333d1e0ad 100644
--- a/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/SupergroupEventMessage.kt
+++ b/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/CommonSupergroupEventMessage.kt
@@ -1,14 +1,19 @@
 package com.github.insanusmokrassar.TelegramBotAPI.types.message
 
 import com.github.insanusmokrassar.TelegramBotAPI.types.MessageIdentifier
+import com.github.insanusmokrassar.TelegramBotAPI.types.User
 import com.github.insanusmokrassar.TelegramBotAPI.types.chat.abstracts.SupergroupChat
 import com.github.insanusmokrassar.TelegramBotAPI.types.message.ChatEvents.abstracts.SupergroupEvent
-import com.github.insanusmokrassar.TelegramBotAPI.types.message.abstracts.ChatEventMessage
+import com.github.insanusmokrassar.TelegramBotAPI.types.message.abstracts.SupergroupEventMessage
 import com.soywiz.klock.DateTime
 
-data class SupergroupEventMessage(
+@Deprecated("Renamed", ReplaceWith("CommonSupergroupEventMessage"))
+typealias SupergroupEventMessage = CommonSupergroupEventMessage
+
+data class CommonSupergroupEventMessage(
     override val messageId: MessageIdentifier,
+    override val user: User,
     override val chat: SupergroupChat,
     override val chatEvent: SupergroupEvent,
     override val date: DateTime
-) : ChatEventMessage
+) : SupergroupEventMessage
diff --git a/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/RawMessage.kt b/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/RawMessage.kt
index 5786d90b4b..e1837adb0b 100644
--- a/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/RawMessage.kt
+++ b/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/RawMessage.kt
@@ -192,14 +192,16 @@ internal data class RawMessage(
         try {
             chatEvent?.let { chatEvent ->
                 when (chat) {
-                    is SupergroupChat -> SupergroupEventMessage(
+                    is SupergroupChat -> CommonSupergroupEventMessage(
                         messageId,
+                        from ?: error("Supergroup events are expected to contain 'from' field"),
                         chat,
                         chatEvent as? SupergroupEvent ?: throwWrongChatEvent(SupergroupEvent::class, chatEvent),
                         date.asDate
                     )
-                    is GroupChat -> GroupEventMessage(
+                    is GroupChat -> CommonGroupEventMessage(
                         messageId,
+                        from ?: error("Supergroup events are expected to contain 'from' field"),
                         chat,
                         chatEvent as? GroupEvent ?: throwWrongChatEvent(GroupChat::class, chatEvent),
                         date.asDate
diff --git a/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/abstracts/GroupEventMessage.kt b/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/abstracts/GroupEventMessage.kt
new file mode 100644
index 0000000000..9ab76cbb50
--- /dev/null
+++ b/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/abstracts/GroupEventMessage.kt
@@ -0,0 +1,3 @@
+package com.github.insanusmokrassar.TelegramBotAPI.types.message.abstracts
+
+interface GroupEventMessage : ChatEventMessage, FromUserMessage
diff --git a/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/abstracts/SupergroupEventMessage.kt b/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/abstracts/SupergroupEventMessage.kt
new file mode 100644
index 0000000000..c88bcabbbe
--- /dev/null
+++ b/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/abstracts/SupergroupEventMessage.kt
@@ -0,0 +1,3 @@
+package com.github.insanusmokrassar.TelegramBotAPI.types.message.abstracts
+
+interface SupergroupEventMessage : GroupEventMessage
diff --git a/TelegramBotAPI-extensions-utils/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/extensions/utils/chat_events/ChatEventsSourcesConversations.kt b/TelegramBotAPI-extensions-utils/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/extensions/utils/chat_events/ChatEventsSourcesConversations.kt
index cc1d263aab..8243a0670b 100644
--- a/TelegramBotAPI-extensions-utils/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/extensions/utils/chat_events/ChatEventsSourcesConversations.kt
+++ b/TelegramBotAPI-extensions-utils/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/extensions/utils/chat_events/ChatEventsSourcesConversations.kt
@@ -17,5 +17,5 @@ fun <T : ChatEventMessage> Flow<ChatEventMessage>.divideBySource(contentType: KC
 }
 
 fun Flow<ChatEventMessage>.onlyChannelEvents() = divideBySource(ChannelEventMessage::class)
-fun Flow<ChatEventMessage>.onlyGroupEvents() = divideBySource(GroupEventMessage::class)
-fun Flow<ChatEventMessage>.onlySupergroupEvents() = divideBySource(SupergroupEventMessage::class)
+fun Flow<ChatEventMessage>.onlyGroupEvents() = divideBySource(CommonGroupEventMessage::class)
+fun Flow<ChatEventMessage>.onlySupergroupEvents() = divideBySource(CommonSupergroupEventMessage::class)
diff --git a/gradle.properties b/gradle.properties
index b6819c45aa..75d3e0f86f 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -10,12 +10,12 @@ kotlin_coroutines_version=1.3.9
 kotlin_serialisation_runtime_version=1.0.0-RC2
 klock_version=1.12.1
 uuid_version=0.2.2
-ktor_version=1.4.0
+ktor_version=1.4.1
 
 javax_activation_version=1.1.1
 
 library_group=com.github.insanusmokrassar
-library_version=0.28.3
+library_version=0.28.4
 
 gradle_bintray_plugin_version=1.8.5
 github_release_plugin_version=2.2.12