diff --git a/packages/server-runtime/src/index.ts b/packages/server-runtime/src/index.ts
index cb8e13672..d6ca438e0 100644
--- a/packages/server-runtime/src/index.ts
+++ b/packages/server-runtime/src/index.ts
@@ -1,6 +1,5 @@
 import type { WebSocketEvent } from '@proj-airi/server-shared/types'
-import type { Peer } from 'crossws'
-import type { AuthenticatedPeer } from './types'
+import type { AuthenticatedPeer, Peer } from './types'
 
 import { env } from 'node:process'
 import { Format, LogLevel, setGlobalFormat, setGlobalLogLevel, useLogg } from '@guiiai/logg'
diff --git a/packages/server-runtime/src/types/conn.ts b/packages/server-runtime/src/types/conn.ts
index 654aa59ee..4a080922c 100644
--- a/packages/server-runtime/src/types/conn.ts
+++ b/packages/server-runtime/src/types/conn.ts
@@ -1,4 +1,12 @@
-import type { Peer } from 'crossws'
+export interface Peer {
+  /**
+   * Unique random [uuid v4](https://developer.mozilla.org/en-US/docs/Glossary/UUID) identifier for the peer.
+   */
+  get id(): string
+  send: (data: unknown, options?: {
+    compress?: boolean
+  }) => number | void | undefined
+}
 
 export interface NamedPeer {
   name: string