diff --git a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/ktorClient.kt b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/ktorClient.kt
index 44c0812..28a87bd 100644
--- a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/ktorClient.kt
+++ b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/ktorClient.kt
@@ -2,9 +2,12 @@ import io.ktor.client.*
 import io.ktor.client.engine.cio.*
 import io.ktor.client.plugins.contentnegotiation.*
 import io.ktor.serialization.kotlinx.json.*
+import kotlinx.serialization.json.Json
 
 val applicationHttpClient = HttpClient(CIO) {
     install(ContentNegotiation) {
-        json()
+        json(json = Json {
+            ignoreUnknownKeys = true
+        })
     }
 }
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