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 7698ed7051..57efb1874d 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
@@ -59,6 +59,8 @@ sealed interface StickerType {
     object Mask : StickerType { override val type: String = "mask" }
     @Serializable
     object CustomEmoji : StickerType { override val type: String = "custom_emoji" }
+    @Serializable
+    data class Unknown(override val type: String = "custom_emoji") : StickerType
 
     object Serializer : KSerializer<StickerType> {
         override val descriptor: SerialDescriptor = String.serializer().descriptor
@@ -68,7 +70,7 @@ sealed interface StickerType {
                 Regular.type -> Regular
                 Mask.type -> Regular
                 CustomEmoji.type -> Regular
-                else -> error("Unknown type of emoji $type")
+                else -> Unknown(type)
             }
         }
 
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/files/Sticker.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/files/Sticker.kt
index bb380507eb..5df612670a 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/files/Sticker.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/files/Sticker.kt
@@ -4,10 +4,12 @@ import dev.inmo.tgbotapi.requests.abstracts.FileId
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.stickers.MaskPosition
 import dev.inmo.tgbotapi.utils.RiskFeature
+import dev.inmo.tgbotapi.utils.nonstrictJsonFormat
 import kotlinx.serialization.*
 import kotlinx.serialization.descriptors.SerialDescriptor
 import kotlinx.serialization.encoding.Decoder
 import kotlinx.serialization.encoding.Encoder
+import kotlinx.serialization.json.JsonElement
 
 @Serializable
 @RiskFeature("This class is used for serialization/deserialization of Sticker interface")
@@ -44,7 +46,8 @@ object StickerSerializer : KSerializer<Sticker> {
     override val descriptor: SerialDescriptor = StickerSurrogate.serializer().descriptor
 
     override fun deserialize(decoder: Decoder): Sticker {
-        val surrogate = StickerSurrogate.serializer().deserialize(decoder)
+        val json = JsonElement.serializer().deserialize(decoder)
+        val surrogate = nonstrictJsonFormat.decodeFromJsonElement(StickerSurrogate.serializer(), json)
 
         return when (surrogate.type) {
             StickerType.Regular -> when {
@@ -82,19 +85,41 @@ object StickerSerializer : KSerializer<Sticker> {
                     surrogate.file_size
                 )
             }
-            StickerType.Mask -> MaskSticker(
-                surrogate.file_id,
-                surrogate.file_unique_id,
-                surrogate.width,
-                surrogate.height,
-                surrogate.mask_position ?: error("For mask stickers field mask_position should be presented"),
-                surrogate.is_animated == true,
-                surrogate.is_video == true,
-                surrogate.thumb,
-                surrogate.emoji,
-                surrogate.set_name,
-                surrogate.file_size
-            )
+            StickerType.Mask -> when {
+                surrogate.is_animated == true -> MaskAnimatedSticker(
+                    surrogate.file_id,
+                    surrogate.file_unique_id,
+                    surrogate.width,
+                    surrogate.height,
+                    surrogate.mask_position ?: error("For mask stickers field mask_position should be presented"),
+                    surrogate.thumb,
+                    surrogate.emoji,
+                    surrogate.set_name,
+                    surrogate.file_size
+                )
+                surrogate.is_video == true -> MaskVideoSticker(
+                    surrogate.file_id,
+                    surrogate.file_unique_id,
+                    surrogate.width,
+                    surrogate.height,
+                    surrogate.mask_position ?: error("For mask stickers field mask_position should be presented"),
+                    surrogate.thumb,
+                    surrogate.emoji,
+                    surrogate.set_name,
+                    surrogate.file_size
+                )
+                else -> MaskSimpleSticker(
+                    surrogate.file_id,
+                    surrogate.file_unique_id,
+                    surrogate.width,
+                    surrogate.height,
+                    surrogate.mask_position ?: error("For mask stickers field mask_position should be presented"),
+                    surrogate.thumb,
+                    surrogate.emoji,
+                    surrogate.set_name,
+                    surrogate.file_size
+                )
+            }
             StickerType.CustomEmoji -> when {
                 surrogate.is_animated == true -> CustomEmojiAnimatedSticker(
                     surrogate.file_id,
@@ -130,6 +155,17 @@ object StickerSerializer : KSerializer<Sticker> {
                     surrogate.file_size
                 )
             }
+            is StickerType.Unknown -> UnknownSticker(
+                surrogate.file_id,
+                surrogate.file_unique_id,
+                surrogate.width,
+                surrogate.height,
+                surrogate.thumb,
+                surrogate.emoji,
+                surrogate.set_name,
+                surrogate.file_size,
+                json
+            )
         }
     }
 
@@ -139,48 +175,22 @@ object StickerSerializer : KSerializer<Sticker> {
 
 }
 
-@Serializable(StickerSerializer::class)
+@Serializable
 sealed interface VideoSticker : Sticker {
     override val isVideo: Boolean
         get() = true
 }
-@Serializable(StickerSerializer::class)
+@Serializable
 sealed interface AnimatedSticker : Sticker {
     override val isAnimated: Boolean
         get() = true
 }
 
-@Serializable(StickerSerializer::class)
+@Serializable
 sealed interface RegularSticker : Sticker {
     val premiumAnimationFile: File?
 }
 
-@Serializable
-data class MaskSticker(
-    @SerialName(fileIdField)
-    override val fileId: FileId,
-    @SerialName(fileUniqueIdField)
-    override val fileUniqueId: FileUniqueId,
-    @SerialName(widthField)
-    override val width: Int,
-    @SerialName(heightField)
-    override val height: Int,
-    @SerialName(maskPositionField)
-    val maskPosition: MaskPosition,
-    @SerialName(isAnimatedField)
-    override val isAnimated: Boolean,
-    @SerialName(isVideoField)
-    override val isVideo: Boolean,
-    @SerialName(thumbField)
-    override val thumb: PhotoSize? = null,
-    @SerialName(emojiField)
-    override val emoji: String? = null,
-    @SerialName(stickerSetNameField)
-    override val stickerSetName: StickerSetName? = null,
-    @SerialName(fileSizeField)
-    override val fileSize: Long? = null,
-) : Sticker
-
 @Serializable
 data class RegularSimpleSticker(
     @SerialName(fileIdField)
@@ -247,7 +257,76 @@ data class RegularVideoSticker(
     override val fileSize: Long? = null,
 ) : RegularSticker, VideoSticker
 
-@Serializable(StickerSerializer::class)
+
+@Serializable
+sealed interface MaskSticker : Sticker {
+    val maskPosition: MaskPosition
+}
+@Serializable
+data class MaskSimpleSticker(
+    @SerialName(fileIdField)
+    override val fileId: FileId,
+    @SerialName(fileUniqueIdField)
+    override val fileUniqueId: FileUniqueId,
+    @SerialName(widthField)
+    override val width: Int,
+    @SerialName(heightField)
+    override val height: Int,
+    @SerialName(maskPositionField)
+    override val maskPosition: MaskPosition,
+    @SerialName(thumbField)
+    override val thumb: PhotoSize? = null,
+    @SerialName(emojiField)
+    override val emoji: String? = null,
+    @SerialName(stickerSetNameField)
+    override val stickerSetName: StickerSetName? = null,
+    @SerialName(fileSizeField)
+    override val fileSize: Long? = null,
+) : MaskSticker
+@Serializable
+data class MaskAnimatedSticker(
+    @SerialName(fileIdField)
+    override val fileId: FileId,
+    @SerialName(fileUniqueIdField)
+    override val fileUniqueId: FileUniqueId,
+    @SerialName(widthField)
+    override val width: Int,
+    @SerialName(heightField)
+    override val height: Int,
+    @SerialName(maskPositionField)
+    override val maskPosition: MaskPosition,
+    @SerialName(thumbField)
+    override val thumb: PhotoSize? = null,
+    @SerialName(emojiField)
+    override val emoji: String? = null,
+    @SerialName(stickerSetNameField)
+    override val stickerSetName: StickerSetName? = null,
+    @SerialName(fileSizeField)
+    override val fileSize: Long? = null,
+) : MaskSticker, AnimatedSticker
+@Serializable
+data class MaskVideoSticker(
+    @SerialName(fileIdField)
+    override val fileId: FileId,
+    @SerialName(fileUniqueIdField)
+    override val fileUniqueId: FileUniqueId,
+    @SerialName(widthField)
+    override val width: Int,
+    @SerialName(heightField)
+    override val height: Int,
+    @SerialName(maskPositionField)
+    override val maskPosition: MaskPosition,
+    @SerialName(thumbField)
+    override val thumb: PhotoSize? = null,
+    @SerialName(emojiField)
+    override val emoji: String? = null,
+    @SerialName(stickerSetNameField)
+    override val stickerSetName: StickerSetName? = null,
+    @SerialName(fileSizeField)
+    override val fileSize: Long? = null,
+) : MaskSticker, VideoSticker
+
+@Serializable
 sealed interface CustomEmojiSticker : Sticker {
     val customEmojiId: CustomEmojiId
 }
@@ -315,3 +394,24 @@ data class CustomEmojiVideoSticker(
     @SerialName(fileSizeField)
     override val fileSize: Long? = null,
 ) : CustomEmojiSticker, VideoSticker
+
+@Serializable
+data class UnknownSticker(
+    @SerialName(fileIdField)
+    override val fileId: FileId,
+    @SerialName(fileUniqueIdField)
+    override val fileUniqueId: FileUniqueId,
+    @SerialName(widthField)
+    override val width: Int,
+    @SerialName(heightField)
+    override val height: Int,
+    @SerialName(thumbField)
+    override val thumb: PhotoSize? = null,
+    @SerialName(emojiField)
+    override val emoji: String? = null,
+    @SerialName(stickerSetNameField)
+    override val stickerSetName: StickerSetName? = null,
+    @SerialName(fileSizeField)
+    override val fileSize: Long? = null,
+    val raw: JsonElement
+) : Sticker
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/stickers/StickerSet.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/stickers/StickerSet.kt
index 663a6e48bc..922c6c6b52 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/stickers/StickerSet.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/stickers/StickerSet.kt
@@ -2,86 +2,297 @@ package dev.inmo.tgbotapi.types.stickers
 
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.files.*
+import dev.inmo.tgbotapi.utils.nonstrictJsonFormat
 import kotlinx.serialization.*
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonElement
 
 @Serializable
+data class SurrogateStickerSet(
+    val name: String,
+    val title: String,
+    val sticker_type: StickerType,
+    val is_animated: Boolean? = false,
+    val is_video: Boolean? = false,
+    val stickers: List<@Serializable(StickerSerializer::class) Sticker> = emptyList(),
+    val thumb: PhotoSize? = null
+)
+
+@Serializable(StickerSet.Serializer::class)
 sealed interface StickerSet {
-    @SerialName(nameField)
     val name: String
-    @SerialName(titleField)
     val title: String
-    @SerialName(stickerTypeField)
     val stickerType: StickerType
-    @SerialName(stickersField)
     val stickers: List<Sticker>
-    @SerialName(isAnimatedField)
     val isAnimated: Boolean
-    @SerialName(isVideoField)
+        get() = false
     val isVideo: Boolean
-    @SerialName(containsMasksField)
+        get() = false
+    val thumb: PhotoSize?
     @Deprecated("Will be removed soon due to its redundancy")
     val containsMasks: Boolean
         get() = this is MaskStickerSet
-    @SerialName(thumbField)
-    val thumb: PhotoSize?
+
+    object Serializer : KSerializer<StickerSet> {
+        override val descriptor: SerialDescriptor = JsonElement.serializer().descriptor
+
+        override fun deserialize(decoder: Decoder): StickerSet {
+            val json = JsonElement.serializer().deserialize(decoder)
+            val surrogate = nonstrictJsonFormat.decodeFromJsonElement(SurrogateStickerSet.serializer(), json)
+
+            return when (surrogate.sticker_type) {
+                StickerType.CustomEmoji -> when {
+                    surrogate.is_animated == true -> CustomEmojiAnimatedStickerSet(
+                        surrogate.name,
+                        surrogate.title,
+                        surrogate.stickers.filterIsInstance<CustomEmojiAnimatedSticker>(),
+                        surrogate.thumb
+                    )
+                    surrogate.is_video == true -> CustomEmojiVideoStickerSet(
+                        surrogate.name,
+                        surrogate.title,
+                        surrogate.stickers.filterIsInstance<CustomEmojiVideoSticker>(),
+                        surrogate.thumb
+                    )
+                    else -> CustomEmojiSimpleStickerSet(
+                        surrogate.name,
+                        surrogate.title,
+                        surrogate.stickers.filterIsInstance<CustomEmojiSimpleSticker>(),
+                        surrogate.thumb
+                    )
+                }
+                StickerType.Mask -> when {
+                    surrogate.is_animated == true -> MaskAnimatedStickerSet(
+                        surrogate.name,
+                        surrogate.title,
+                        surrogate.stickers.filterIsInstance<MaskAnimatedSticker>(),
+                        surrogate.thumb
+                    )
+                    surrogate.is_video == true -> MaskVideoStickerSet(
+                        surrogate.name,
+                        surrogate.title,
+                        surrogate.stickers.filterIsInstance<MaskVideoSticker>(),
+                        surrogate.thumb
+                    )
+                    else -> MaskSimpleStickerSet(
+                        surrogate.name,
+                        surrogate.title,
+                        surrogate.stickers.filterIsInstance<MaskSimpleSticker>(),
+                        surrogate.thumb
+                    )
+                }
+                StickerType.Regular -> when {
+                    surrogate.is_animated == true -> RegularAnimatedStickerSet(
+                        surrogate.name,
+                        surrogate.title,
+                        surrogate.stickers.filterIsInstance<RegularAnimatedSticker>(),
+                        surrogate.thumb
+                    )
+                    surrogate.is_video == true -> RegularVideoStickerSet(
+                        surrogate.name,
+                        surrogate.title,
+                        surrogate.stickers.filterIsInstance<RegularVideoSticker>(),
+                        surrogate.thumb
+                    )
+                    else -> RegularSimpleStickerSet(
+                        surrogate.name,
+                        surrogate.title,
+                        surrogate.stickers.filterIsInstance<RegularSimpleSticker>(),
+                        surrogate.thumb
+                    )
+                }
+                is StickerType.Unknown -> UnknownStickerSet(
+                    surrogate.name,
+                    surrogate.title,
+                    surrogate.stickers.filterIsInstance<RegularSimpleSticker>(),
+                    surrogate.sticker_type,
+                    surrogate.thumb,
+                    json
+                )
+            }
+        }
+
+        override fun serialize(encoder: Encoder, value: StickerSet) {
+            TODO("Not yet implemented")
+        }
+    }
 }
 
 @Serializable
-data class RegularStickerSet(
+sealed interface AnimatedStickerSet : StickerSet {
+    override val isAnimated: Boolean
+        get() = true
+}
+@Serializable
+sealed interface VideoStickerSet : StickerSet {
+    override val isVideo: Boolean
+        get() = true
+}
+@Serializable
+sealed interface RegularStickerSet : StickerSet
+@Serializable
+sealed interface MaskStickerSet : StickerSet
+@Serializable
+sealed interface CustomEmojiStickerSet : StickerSet
+
+@Serializable
+data class RegularSimpleStickerSet(
     @SerialName(nameField)
     override val name: String,
     @SerialName(titleField)
     override val title: String,
     @SerialName(stickersField)
-    override val stickers: List<RegularSticker>,
-    @SerialName(isAnimatedField)
-    override val isAnimated: Boolean = false,
-    @SerialName(isVideoField)
-    override val isVideo: Boolean = false,
+    override val stickers: List<RegularSimpleSticker>,
     @SerialName(thumbField)
     override val thumb: PhotoSize? = null
-) : StickerSet {
+) : RegularStickerSet {
     @SerialName(stickerTypeField)
     @EncodeDefault
     override val stickerType: StickerType = StickerType.Regular
 }
 
 @Serializable
-data class MaskStickerSet(
+data class RegularAnimatedStickerSet(
     @SerialName(nameField)
     override val name: String,
     @SerialName(titleField)
     override val title: String,
     @SerialName(stickersField)
-    override val stickers: List<MaskSticker>,
-    @SerialName(isAnimatedField)
-    override val isAnimated: Boolean = false,
-    @SerialName(isVideoField)
-    override val isVideo: Boolean = false,
+    override val stickers: List<RegularAnimatedSticker>,
     @SerialName(thumbField)
     override val thumb: PhotoSize? = null
-) : StickerSet {
+) : RegularStickerSet, AnimatedStickerSet {
+    @SerialName(stickerTypeField)
+    @EncodeDefault
+    override val stickerType: StickerType = StickerType.Regular
+}
+
+@Serializable
+data class RegularVideoStickerSet(
+    @SerialName(nameField)
+    override val name: String,
+    @SerialName(titleField)
+    override val title: String,
+    @SerialName(stickersField)
+    override val stickers: List<RegularVideoSticker>,
+    @SerialName(thumbField)
+    override val thumb: PhotoSize? = null
+) : RegularStickerSet, VideoStickerSet {
+    @SerialName(stickerTypeField)
+    @EncodeDefault
+    override val stickerType: StickerType = StickerType.Regular
+}
+
+@Serializable
+data class MaskSimpleStickerSet(
+    @SerialName(nameField)
+    override val name: String,
+    @SerialName(titleField)
+    override val title: String,
+    @SerialName(stickersField)
+    override val stickers: List<MaskSimpleSticker>,
+    @SerialName(thumbField)
+    override val thumb: PhotoSize? = null
+) : MaskStickerSet {
     @SerialName(stickerTypeField)
     @EncodeDefault
     override val stickerType: StickerType = StickerType.Mask
 }
 
 @Serializable
-data class CustomEmojiStickerSet(
+data class MaskAnimatedStickerSet(
     @SerialName(nameField)
     override val name: String,
     @SerialName(titleField)
     override val title: String,
     @SerialName(stickersField)
-    override val stickers: List<CustomEmojiSticker>,
-    @SerialName(isAnimatedField)
-    override val isAnimated: Boolean = false,
-    @SerialName(isVideoField)
-    override val isVideo: Boolean = false,
+    override val stickers: List<MaskAnimatedSticker>,
     @SerialName(thumbField)
     override val thumb: PhotoSize? = null
-) : StickerSet {
+) : MaskStickerSet, AnimatedStickerSet {
+    @SerialName(stickerTypeField)
+    @EncodeDefault
+    override val stickerType: StickerType = StickerType.Mask
+}
+
+@Serializable
+data class MaskVideoStickerSet(
+    @SerialName(nameField)
+    override val name: String,
+    @SerialName(titleField)
+    override val title: String,
+    @SerialName(stickersField)
+    override val stickers: List<MaskVideoSticker>,
+    @SerialName(thumbField)
+    override val thumb: PhotoSize? = null
+) : MaskStickerSet, VideoStickerSet {
+    @SerialName(stickerTypeField)
+    @EncodeDefault
+    override val stickerType: StickerType = StickerType.Mask
+}
+
+@Serializable
+data class CustomEmojiSimpleStickerSet(
+    @SerialName(nameField)
+    override val name: String,
+    @SerialName(titleField)
+    override val title: String,
+    @SerialName(stickersField)
+    override val stickers: List<CustomEmojiSimpleSticker>,
+    @SerialName(thumbField)
+    override val thumb: PhotoSize? = null
+) : CustomEmojiStickerSet {
     @SerialName(stickerTypeField)
     @EncodeDefault
     override val stickerType: StickerType = StickerType.CustomEmoji
 }
+
+@Serializable
+data class CustomEmojiAnimatedStickerSet(
+    @SerialName(nameField)
+    override val name: String,
+    @SerialName(titleField)
+    override val title: String,
+    @SerialName(stickersField)
+    override val stickers: List<CustomEmojiAnimatedSticker>,
+    @SerialName(thumbField)
+    override val thumb: PhotoSize? = null
+) : CustomEmojiStickerSet, AnimatedStickerSet {
+    @SerialName(stickerTypeField)
+    @EncodeDefault
+    override val stickerType: StickerType = StickerType.CustomEmoji
+}
+
+@Serializable
+data class CustomEmojiVideoStickerSet(
+    @SerialName(nameField)
+    override val name: String,
+    @SerialName(titleField)
+    override val title: String,
+    @SerialName(stickersField)
+    override val stickers: List<CustomEmojiVideoSticker>,
+    @SerialName(thumbField)
+    override val thumb: PhotoSize? = null
+) : CustomEmojiStickerSet, VideoStickerSet {
+    @SerialName(stickerTypeField)
+    @EncodeDefault
+    override val stickerType: StickerType = StickerType.CustomEmoji
+}
+
+@Serializable
+data class UnknownStickerSet(
+    @SerialName(nameField)
+    override val name: String,
+    @SerialName(titleField)
+    override val title: String,
+    @SerialName(stickersField)
+    override val stickers: List<Sticker>,
+    @SerialName(stickerTypeField)
+    override val stickerType: StickerType,
+    @SerialName(thumbField)
+    override val thumb: PhotoSize? = null,
+    val raw: JsonElement
+) : CustomEmojiStickerSet, VideoStickerSet