diff --git a/CHANGELOG.md b/CHANGELOG.md
index abcea7f75e..2f18ad2b52 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,9 @@
     * All deprecations was removed
     * `RequestException` now extends `io.ktor.utils.io.errors.IOException` instead of `kotlinx.io.IOException`
     * `Any#toJson` now is NOT `inline`
+    * `FlowsUpdatesFilter` now as marked my annotation `FlowPreview`
+    * `PathedFile#fullUrl` now is not `inline` function
+    * `SimpleRequest#json` now is not `inline` and `internal` function
 
 ## 0.24.0
 
diff --git a/TelegramBotAPI/build.gradle b/TelegramBotAPI/build.gradle
index c475e31eed..d42e420763 100644
--- a/TelegramBotAPI/build.gradle
+++ b/TelegramBotAPI/build.gradle
@@ -81,4 +81,13 @@ kotlin {
             }
         }
     }
+
+
+    targets.all {
+        compilations.all {
+            kotlinOptions {
+                freeCompilerArgs += ["-Xuse-experimental=kotlinx.coroutines.ExperimentalCoroutinesApi", "-Xopt-in=kotlin.RequiresOptIn"]
+            }
+        }
+    }
 }
diff --git a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/abstracts/SimpleRequest.kt b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/abstracts/SimpleRequest.kt
index 523b1c069d..89ba8af5b5 100644
--- a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/abstracts/SimpleRequest.kt
+++ b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/abstracts/SimpleRequest.kt
@@ -9,4 +9,4 @@ interface SimpleRequest<T: Any> : Request<T> {
 }
 
 @Suppress("UNCHECKED_CAST")
-inline fun <T: Any, K: SimpleRequest<T>> K.json(): JsonObject = toJsonWithoutNulls(requestSerializer as SerializationStrategy<K>)
+internal fun <T: Any, K: SimpleRequest<T>> K.json(): JsonObject = toJsonWithoutNulls(requestSerializer as SerializationStrategy<K>)
diff --git a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/files/PathedFile.kt b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/files/PathedFile.kt
index c2a01cab85..24331c325a 100644
--- a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/files/PathedFile.kt
+++ b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/files/PathedFile.kt
@@ -21,4 +21,4 @@ data class PathedFile(
 ): TelegramMediaFile
 
 fun TelegramAPIUrlsKeeper.resolveFileURL(file: PathedFile): String = "$fileBaseUrl/${file.filePath}"
-inline fun PathedFile.fullUrl(keeper: TelegramAPIUrlsKeeper): String = keeper.resolveFileURL(this)
+fun PathedFile.fullUrl(keeper: TelegramAPIUrlsKeeper): String = keeper.resolveFileURL(this)
diff --git a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/files/PhotoSize.kt b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/files/PhotoSize.kt
index 360070e62c..a79862a075 100644
--- a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/files/PhotoSize.kt
+++ b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/files/PhotoSize.kt
@@ -28,7 +28,6 @@ data class PhotoSize(
     override val width: Int,
     override val height: Int
 ) : SizedMediaFile {
-    @Transient
     val resolution: Long by lazy {
         width.toLong() * height
     }
diff --git a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/RawMessage.kt b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/RawMessage.kt
index b1a0cad11f..8e4ff44663 100644
--- a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/RawMessage.kt
+++ b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/RawMessage.kt
@@ -134,7 +134,6 @@ internal data class RawMessage(
         }
     }
 
-    @Transient
     private val forwarded: ForwardInfo? by lazy {
         forward_date ?: return@lazy null // According to the documentation, now any forwarded message contains this field
         when {
diff --git a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/abstracts/Message.kt b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/abstracts/Message.kt
index 756fdef996..cd9d2d4408 100644
--- a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/abstracts/Message.kt
+++ b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/abstracts/Message.kt
@@ -23,6 +23,8 @@ internal class TelegramBotAPIMessageDeserializationStrategyClass<T> : Deserializ
     override val descriptor: SerialDescriptor = SerialDescriptor("TelegramBotAPIMessageSerializer", PolymorphicKind.OPEN)
 
     override fun patch(decoder: Decoder, old: T): T = throw UpdateNotSupportedException("TelegramBotAPIMessageSerializer")
+
+    @Suppress("UNCHECKED_CAST")
     override fun deserialize(decoder: Decoder): T {
         return RawMessage.serializer().deserialize(decoder).asMessage as T
     }
diff --git a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/updateshandlers/FlowsUpdatesFilter.kt b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/updateshandlers/FlowsUpdatesFilter.kt
index e57697e4fa..c0cafb4710 100644
--- a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/updateshandlers/FlowsUpdatesFilter.kt
+++ b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/updateshandlers/FlowsUpdatesFilter.kt
@@ -3,6 +3,7 @@ package com.github.insanusmokrassar.TelegramBotAPI.updateshandlers
 import com.github.insanusmokrassar.TelegramBotAPI.types.update.*
 import com.github.insanusmokrassar.TelegramBotAPI.types.update.MediaGroupUpdates.*
 import com.github.insanusmokrassar.TelegramBotAPI.types.update.abstracts.Update
+import kotlinx.coroutines.FlowPreview
 import kotlinx.coroutines.channels.BroadcastChannel
 import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.flow.Flow
@@ -10,6 +11,7 @@ import kotlinx.coroutines.flow.asFlow
 
 private fun <T> BroadcastChannel<T>.createUpdateReceiver(): UpdateReceiver<T> = ::send
 
+@FlowPreview
 class FlowsUpdatesFilter(
     broadcastChannelsSize: Int = Channel.CONFLATED
 ): UpdatesFilter {