diff --git a/app/src/main/kotlin/com/hippo/ehviewer/client/parser/ByteBufferSource.kt b/app/src/main/kotlin/com/hippo/ehviewer/client/parser/ByteBufferSource.kt
index ac81befa3..0f38d0237 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/client/parser/ByteBufferSource.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/client/parser/ByteBufferSource.kt
@@ -1,34 +1,13 @@
 package com.hippo.ehviewer.client.parser
 
-import com.hippo.ehviewer.client.parseAs
+import io.ktor.util.moveToByteArray
 import java.nio.ByteBuffer
-import okio.Buffer
-import okio.Source
-import okio.Timeout
-import okio.buffer
-
-fun ByteBuffer.asSource() = object : Source {
-    private val buffer = this@asSource.slice()
-    private val len = buffer.capacity()
-
-    override fun close() = Unit
-
-    override fun read(sink: Buffer, byteCount: Long): Long {
-        if (buffer.position() == len) return -1
-        val pos = buffer.position()
-        val newLimit = (pos + byteCount).toInt().coerceAtMost(len)
-        buffer.limit(newLimit)
-        return sink.write(buffer).toLong()
-    }
-
-    override fun timeout() = Timeout.NONE
-}
+import kotlinx.serialization.cbor.Cbor
+import kotlinx.serialization.decodeFromByteArray
 
 inline fun <reified T> unmarshalParsingAs(body: ByteBuffer, parser: (ByteBuffer, Int) -> Int): T {
-    // We want to use cbor as it have smaller output size
-    // But we would rather reuse allocated ByteArrays (i.e. decode with okio Buffer)
-    val jsonBytes = parser(body, body.limit())
-    body.clear()
-    body.limit(jsonBytes)
-    return body.asSource().buffer().use { it.parseAs<T>() }
+    val cborBytes = parser(body, body.limit())
+    body.limit(cborBytes)
+    val array = body.moveToByteArray()
+    return Cbor.decodeFromByteArray<T>(array)
 }
diff --git a/app/src/main/rust/Cargo.toml b/app/src/main/rust/Cargo.toml
index 84f92087f..20ceaab47 100644
--- a/app/src/main/rust/Cargo.toml
+++ b/app/src/main/rust/Cargo.toml
@@ -15,7 +15,7 @@ tl = "0.7"
 log = "0.4"
 android_logger = { default-features = false, version = "0.13" }
 once_cell = { default-features = false, version = "1.19" }
-serde_json = "1.0"
+serde_cbor = "0.11"
 serde = { version = "1.0", features = ["derive"] }
 
 [profile.release]
diff --git a/app/src/main/rust/src/lib.rs b/app/src/main/rust/src/lib.rs
index b1bccc29c..28b7e65cd 100644
--- a/app/src/main/rust/src/lib.rs
+++ b/app/src/main/rust/src/lib.rs
@@ -91,7 +91,7 @@ where
                     let slice = slice_from_raw_parts_mut(ptr, 0x80000);
                     Cursor::new(&mut *slice)
                 };
-                serde_json::to_writer(&mut cursor, &value).unwrap();
+                serde_cbor::to_writer(&mut cursor, &value).unwrap();
                 cursor.position() as i32
             }
         }