diff --git a/.changeset/egress-passthrough.md b/.changeset/egress-passthrough.md
new file mode 100644
index 0000000..64060a1
--- /dev/null
+++ b/.changeset/egress-passthrough.md
@@ -0,0 +1,5 @@
+---
+"server-sdk-kotlin": minor
+---
+
+Update protocol: `startEgress` accepts the new `EncodingOptionsPreset.PASSTHROUGH` to skip transcoding for a single-track `MediaSource`. Removes the unused `UpdateEgressRequest` message.
diff --git a/protocol b/protocol
index 39fc751..2122e1d 160000
--- a/protocol
+++ b/protocol
@@ -1 +1 @@
-Subproject commit 39fc751df610243c1bfdf85d3be6b3928ecef014
+Subproject commit 2122e1d08bc97ef941c07ae530d5a45f6f05dd2c
diff --git a/src/test/kotlin/io/livekit/server/EgressServiceClientTest.kt b/src/test/kotlin/io/livekit/server/EgressServiceClientTest.kt
index 1bc2f5d..4bc93c3 100644
--- a/src/test/kotlin/io/livekit/server/EgressServiceClientTest.kt
+++ b/src/test/kotlin/io/livekit/server/EgressServiceClientTest.kt
@@ -225,6 +225,20 @@ class EgressServiceClientTest {
         )
     }
 
+    @Test
+    fun startEgressMediaPassthrough() {
+        client.startEgress(
+            roomName = "room",
+            media = LivekitEgress.MediaSource.getDefaultInstance(),
+            outputs = listOf(
+                LivekitEgress.Output.newBuilder()
+                    .setFile(LivekitEgress.FileOutput.getDefaultInstance())
+                    .build(),
+            ),
+            optionsPreset = LivekitEgress.EncodingOptionsPreset.PASSTHROUGH,
+        )
+    }
+
     @Test
     fun startEgressWithOptionsStorageAndWebhooks() {
         client.startEgress(