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 ba6b903..82c4a6a 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
@@ -50,7 +50,9 @@ public class KtorMeetacyEngine(
             json(json)
         }
         defaultRequest {
-            header(HttpHeaders.ContentType, ContentType.Application.Json)
+            if (!url.protocol.isWebsocket()) {
+                header(HttpHeaders.ContentType, ContentType.Application.Json)
+            }
         }
     }