diff --git a/api/api-ktor/build.gradle.kts b/api/api-ktor/build.gradle.kts
index e4a35a2..1b2fef2 100644
--- a/api/api-ktor/build.gradle.kts
+++ b/api/api-ktor/build.gradle.kts
@@ -12,6 +12,7 @@ dependencies {
     commonMainImplementation(libs.ktorClientWebSockets)
     commonMainImplementation(libs.rsocketKtorClient)
     commonMainImplementation(libs.ktorClientContentNegotiation)
+    commonMainImplementation(libs.ktorSerializationJson)
 
     commonMainApi(projects.api)
     commonMainImplementation(projects.types.serializable)
diff --git a/api/api-ktor/src/commonMain/kotlin/app/meetacy/sdk/engine/ktor/KtorMeetacyEngine.kt b/api/api-ktor/src/commonMain/kotlin/app/meetacy/sdk/engine/ktor/KtorMeetacyEngine.kt
index 4c03597..6f942b8 100644
--- a/api/api-ktor/src/commonMain/kotlin/app/meetacy/sdk/engine/ktor/KtorMeetacyEngine.kt
+++ b/api/api-ktor/src/commonMain/kotlin/app/meetacy/sdk/engine/ktor/KtorMeetacyEngine.kt
@@ -26,6 +26,7 @@ import io.ktor.client.plugins.contentnegotiation.*
 import io.ktor.client.plugins.websocket.*
 import io.ktor.client.request.*
 import io.ktor.http.*
+import io.ktor.serialization.kotlinx.json.*
 import io.ktor.utils.io.errors.*
 import io.rsocket.kotlin.ktor.client.RSocketSupport
 import kotlinx.coroutines.CancellationException
@@ -42,17 +43,14 @@ public class KtorMeetacyEngine(
     }
 
     private val httpClient = httpClient.config {
-
         expectSuccess = true
         install(WebSockets)
         install(RSocketSupport)
         install(ContentNegotiation) {
-            Json(json) {
-                ignoreUnknownKeys = true
-            }
+            json(json)
         }
         defaultRequest {
-            header(HttpHeaders.ContentType, ContentType.Application.Json.toString())
+            header(HttpHeaders.ContentType, ContentType.Application.Json)
         }
     }