diff --git a/client/src/jsMain/kotlin/dev/inmo/postssystem/client/JSDI.kt b/client/src/jsMain/kotlin/dev/inmo/postssystem/client/JSDI.kt
index 8fd6dd5a..e08d7513 100644
--- a/client/src/jsMain/kotlin/dev/inmo/postssystem/client/JSDI.kt
+++ b/client/src/jsMain/kotlin/dev/inmo/postssystem/client/JSDI.kt
@@ -8,7 +8,6 @@ import dev.inmo.postssystem.features.auth.client.ui.*
 import dev.inmo.postssystem.features.common.common.baseKoin
 import dev.inmo.postssystem.features.common.common.getAllDistinct
 import dev.inmo.postssystem.features.common.common.ui.fsm.UIFSMHandler
-import dev.inmo.postssystem.features.common.common.ui.fsm.UIFSMStateSerializer
 import dev.inmo.postssystem.services.posts.client.ui.list.PostsListUIFSMState
 import dev.inmo.postssystem.services.posts.client.ui.list.PostsListUIState
 import kotlinx.browser.*
@@ -29,8 +28,7 @@ val defaultTypedSerializer = TypedSerializer<Any>(
     "Short" to Short.serializer(),
     "Byte" to Byte.serializer(),
     "Float" to Float.serializer(),
-    "Double" to Double.serializer(),
-    "UIFSMState" to UIFSMStateSerializer
+    "Double" to Double.serializer()
 )
 val defaultSerialFormat = Json {
     ignoreUnknownKeys = true
diff --git a/features/auth/client/src/commonMain/kotlin/dev/inmo/postssystem/features/auth/client/ui/AuthUIState.kt b/features/auth/client/src/commonMain/kotlin/dev/inmo/postssystem/features/auth/client/ui/AuthUIState.kt
index 10ad4677..5ea6e228 100644
--- a/features/auth/client/src/commonMain/kotlin/dev/inmo/postssystem/features/auth/client/ui/AuthUIState.kt
+++ b/features/auth/client/src/commonMain/kotlin/dev/inmo/postssystem/features/auth/client/ui/AuthUIState.kt
@@ -4,9 +4,9 @@ import kotlinx.serialization.Serializable
 
 @Serializable
 sealed interface AuthUIError {
-    @Serializable
+//    @Serializable
     object ServerUnavailable : AuthUIError
-    @Serializable
+//    @Serializable
     object AuthIncorrect : AuthUIError
 }
 
@@ -14,9 +14,9 @@ sealed interface AuthUIError {
 sealed interface AuthUIState {
     @Serializable
     data class Init(val showError: AuthUIError? = null) : AuthUIState
-    @Serializable
+//    @Serializable
     object Loading : AuthUIState
-    @Serializable
+//    @Serializable
     object Authorized : AuthUIState
 
     companion object {
diff --git a/features/posts/common/src/commonMain/kotlin/dev/inmo/postssystem/features/posts/common/Post.kt b/features/posts/common/src/commonMain/kotlin/dev/inmo/postssystem/features/posts/common/Post.kt
index aa2a6f84..00007290 100644
--- a/features/posts/common/src/commonMain/kotlin/dev/inmo/postssystem/features/posts/common/Post.kt
+++ b/features/posts/common/src/commonMain/kotlin/dev/inmo/postssystem/features/posts/common/Post.kt
@@ -25,8 +25,8 @@ typealias ContentIds = List<ContentId>
  * @see RegisteredPost
  */
 @Serializable
-sealed class Post {
-    abstract val content: ContentIds
+sealed interface Post {
+    val content: ContentIds
 }
 
 /**
@@ -35,7 +35,7 @@ sealed class Post {
 @Serializable
 data class NewPost(
     override val content: ContentIds
-) : Post()
+) : Post
 
 /**
  * Registered [Post]
@@ -46,12 +46,12 @@ data class RegisteredPost(
     override val content: ContentIds,
     @Serializable(DateTimeSerializer::class)
     val creationDate: DateTime
-) : Post()
+) : Post
 
 @Serializable
 data class PostWithContent(
     val post: Post,
-    val content: List<Content>
+    val content: List<@Polymorphic Content>
 )
 
 @Serializable
diff --git a/services/posts/client/src/commonMain/kotlin/dev/inmo/postssystem/services/posts/client/ui/create/PostCreateUIState.kt b/services/posts/client/src/commonMain/kotlin/dev/inmo/postssystem/services/posts/client/ui/create/PostCreateUIState.kt
index 46925eed..be84d18c 100644
--- a/services/posts/client/src/commonMain/kotlin/dev/inmo/postssystem/services/posts/client/ui/create/PostCreateUIState.kt
+++ b/services/posts/client/src/commonMain/kotlin/dev/inmo/postssystem/services/posts/client/ui/create/PostCreateUIState.kt
@@ -3,14 +3,14 @@ package dev.inmo.postssystem.services.posts.client.ui.create
 import kotlinx.serialization.Serializable
 
 @Serializable
-sealed class PostCreateUIState {
-    @Serializable
-    object Init : PostCreateUIState()
-    @Serializable
-    object Uploading : PostCreateUIState()
-    @Serializable
-    object Fail : PostCreateUIState()
-    @Serializable
-    object Completed : PostCreateUIState()
+sealed interface PostCreateUIState {
+//    @Serializable
+    object Init : PostCreateUIState
+//    @Serializable
+    object Uploading : PostCreateUIState
+//    @Serializable
+    object Fail : PostCreateUIState
+//    @Serializable
+    object Completed : PostCreateUIState
 
 }
diff --git a/services/posts/client/src/commonMain/kotlin/dev/inmo/postssystem/services/posts/client/ui/list/PostsListUIState.kt b/services/posts/client/src/commonMain/kotlin/dev/inmo/postssystem/services/posts/client/ui/list/PostsListUIState.kt
index 82e61f3d..53eeab72 100644
--- a/services/posts/client/src/commonMain/kotlin/dev/inmo/postssystem/services/posts/client/ui/list/PostsListUIState.kt
+++ b/services/posts/client/src/commonMain/kotlin/dev/inmo/postssystem/services/posts/client/ui/list/PostsListUIState.kt
@@ -4,13 +4,13 @@ import dev.inmo.postssystem.features.posts.common.RegisteredPostWithContent
 import kotlinx.serialization.Serializable
 
 @Serializable
-sealed class PostsListUIState {
-    @Serializable
-    object Loading : PostsListUIState()
+sealed interface PostsListUIState {
+//    @Serializable
+    object Loading : PostsListUIState
 
     @Serializable
     data class Show(
         val posts: List<RegisteredPostWithContent>
-    ) : PostsListUIState()
+    ) : PostsListUIState
 
 }