diff --git a/CHANGELOG.md b/CHANGELOG.md
index fae726e1ec..176a8c50c7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 # TelegramBotAPI changelog
 
+
 ## 0.38.0
 
 * `Common`:
@@ -13,7 +14,14 @@
 
 ## 0.37.4
 
-## 0.37.3 Hotfix of 0.37.3
+* `Common`:
+    * `Version`:
+        * `MicroUtils`: `0.8.7` -> `0.8.9`
+* `Core`:
+    * New `SupergroupEvent` subtype: `MigratedToSupergroup`. This event is sent when a group is converted to a supergroup while bot is in the group.
+    * Helper extenstion functions on `ChatEvent` to cast it to `MigratedToSupergroup`.
+
+## 0.37.3 Hotfix of 0.37.2
 
 * `Core`:
     * Fixes in hierarchy (and creating) of messages from channels
@@ -22,6 +30,8 @@
 
 `0.37.2` changelog:
 
+_This update contains [Telegram Bot API 5.5](https://core.telegram.org/bots/api-changelog#december-7-2021) implementation_
+
 * `Common`:
     * `Version`:
         * `MicroUtils`: `0.8.2` -> `0.8.7`
diff --git a/gradle.properties b/gradle.properties
index bd9559450c..b1e761c4a1 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -12,6 +12,7 @@ klock_version=2.4.10
 uuid_version=0.3.1
 ktor_version=1.6.7
 
+
 micro_utils_version=0.9.0
 
 javax_activation_version=1.1.1
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/GroupChatCreated.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/GroupChatCreated.kt
index edecacfd6a..4ac21f5771 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/GroupChatCreated.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/GroupChatCreated.kt
@@ -1,8 +1,8 @@
 package dev.inmo.tgbotapi.types.message.ChatEvents
 
-import dev.inmo.tgbotapi.types.ChatIdentifier
+import dev.inmo.tgbotapi.types.ChatId
 import dev.inmo.tgbotapi.types.message.ChatEvents.abstracts.GroupEvent
 
 class GroupChatCreated(
-    val migratedTo: ChatIdentifier?
+    val migratedTo: ChatId?
 ): GroupEvent
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/MigratedToSupergroup.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/MigratedToSupergroup.kt
new file mode 100644
index 0000000000..276deeb0e1
--- /dev/null
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/MigratedToSupergroup.kt
@@ -0,0 +1,11 @@
+package dev.inmo.tgbotapi.types.message.ChatEvents
+
+import dev.inmo.tgbotapi.types.ChatId
+import dev.inmo.tgbotapi.types.message.ChatEvents.abstracts.SupergroupEvent
+
+/**
+ * This event is sent when a group is converted to a supergroup.
+ */
+data class MigratedToSupergroup(
+    val migratedFrom: ChatId
+): SupergroupEvent
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/SupergroupChatCreated.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/SupergroupChatCreated.kt
index 5ea4ef8247..31830380cb 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/SupergroupChatCreated.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/SupergroupChatCreated.kt
@@ -1,8 +1,8 @@
 package dev.inmo.tgbotapi.types.message.ChatEvents
 
-import dev.inmo.tgbotapi.types.ChatIdentifier
+import dev.inmo.tgbotapi.types.ChatId
 import dev.inmo.tgbotapi.types.message.ChatEvents.abstracts.SupergroupEvent
 
 class SupergroupChatCreated(
-    val migratedFrom: ChatIdentifier?
+    val migratedFrom: ChatId?
 ): SupergroupEvent
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/RawMessage.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/RawMessage.kt
index 343afb1f75..c0fcc5334b 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/RawMessage.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/RawMessage.kt
@@ -75,8 +75,8 @@ internal data class RawMessage(
     private val group_chat_created: Boolean = false,
     private val supergroup_chat_created: Boolean = false,
     private val channel_chat_created: Boolean = false,
-    private val migrate_to_chat_id: ChatIdentifier? = null,
-    private val migrate_from_chat_id: ChatIdentifier? = null,
+    private val migrate_to_chat_id: ChatId? = null,
+    private val migrate_from_chat_id: ChatId? = null,
     private val pinned_message: RawMessage? = null,
     private val invoice: Invoice? = null,
     private val dice: Dice? = null,
@@ -194,6 +194,9 @@ internal data class RawMessage(
             supergroup_chat_created -> SupergroupChatCreated(
                 migrate_from_chat_id
             )
+            migrate_from_chat_id != null -> MigratedToSupergroup(
+                migrate_from_chat_id
+            )
             channel_chat_created -> ChannelChatCreated()
             pinned_message != null -> PinnedMessage(pinned_message.asMessage)
             proximity_alert_triggered != null -> proximity_alert_triggered
diff --git a/tgbotapi.core/src/commonTest/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/MigratedToSupergroupTest.kt b/tgbotapi.core/src/commonTest/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/MigratedToSupergroupTest.kt
new file mode 100644
index 0000000000..4c243155a3
--- /dev/null
+++ b/tgbotapi.core/src/commonTest/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/MigratedToSupergroupTest.kt
@@ -0,0 +1,52 @@
+package dev.inmo.tgbotapi.types.message.ChatEvents
+
+import dev.inmo.tgbotapi.TestsJsonFormat
+import dev.inmo.tgbotapi.extensions.utils.asMessageUpdate
+import dev.inmo.tgbotapi.extensions.utils.asMigratedToSupergroup
+import dev.inmo.tgbotapi.extensions.utils.asSupergroupChatCreated
+import dev.inmo.tgbotapi.extensions.utils.asSupergroupEventMessage
+import dev.inmo.tgbotapi.types.ChatId
+import dev.inmo.tgbotapi.types.update.abstracts.UpdateDeserializationStrategy
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertIs
+import kotlin.test.fail
+
+
+class MigratedToSupergroupTest {
+    @Test
+    fun MigratedToSupergroupEventShouldBeParsed() {
+        val payload = """
+            {
+              "update_id": 42,
+              "message": {
+                "message_id": 1,
+                "from": {
+                  "id": 1087968824,
+                  "is_bot": true,
+                  "first_name": "Group",
+                  "username": "GroupAnonymousBot"
+                },
+                "sender_chat": {
+                  "id": 42,
+                  "title": "MigratedToSupergroupTest",
+                  "type": "supergroup"
+                },
+                "chat": {
+                  "id": 42,
+                  "title": "MigratedToSupergroupTest",
+                  "type": "supergroup"
+                },
+                "date": 1639955462,
+                "migrate_from_chat_id": 57005
+              }
+            }
+        """.trimIndent()
+        val update = TestsJsonFormat.decodeFromString(UpdateDeserializationStrategy, payload)
+        val message = update.asMessageUpdate() ?: fail("update should be of MessageUpdate subtype")
+        val data = message.data.asSupergroupEventMessage() ?: fail("message should be of SupergroupEventMessage subtype")
+        val event = data.chatEvent.asMigratedToSupergroup() ?: fail("event should be of SupergroupChatCreated subtype")
+
+        assertEquals(ChatId(57005), event.migratedFrom)
+    }
+}
diff --git a/tgbotapi.utils/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/utils/ClassCasts.kt b/tgbotapi.utils/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/utils/ClassCasts.kt
index 52af1c45fe..a0e7317dc1 100644
--- a/tgbotapi.utils/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/utils/ClassCasts.kt
+++ b/tgbotapi.utils/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/utils/ClassCasts.kt
@@ -3081,6 +3081,15 @@ inline fun ChatEvent.asSupergroupChatCreated(): SupergroupChatCreated? = this as
 @PreviewFeature
 inline fun ChatEvent.requireSupergroupChatCreated(): SupergroupChatCreated = this as SupergroupChatCreated
 
+@PreviewFeature
+inline fun <T> ChatEvent.whenMigratedToSupergroup(block: (MigratedToSupergroup) -> T) = asMigratedToSupergroup() ?.let(block)
+
+@PreviewFeature
+inline fun ChatEvent.asMigratedToSupergroup(): MigratedToSupergroup? = this as? MigratedToSupergroup
+
+@PreviewFeature
+inline fun ChatEvent.requireMigratedToSupergroup(): MigratedToSupergroup = this as MigratedToSupergroup
+
 @PreviewFeature
 inline fun <T> ChatEvent.whenChannelEvent(block: (ChannelEvent) -> T) = asChannelEvent() ?.let(block)