diff --git a/runtime/js/27_websocket.js b/runtime/js/27_websocket.js
index 60428c24d5..9f86bdbed0 100644
--- a/runtime/js/27_websocket.js
+++ b/runtime/js/27_websocket.js
@@ -167,6 +167,7 @@
         this.#bufferedAmount += ta.size;
         core.jsonOpAsync("op_ws_send", {
           rid: this.#rid,
+          kind: "binary",
         }, ta).then(() => {
           this.#bufferedAmount -= ta.size;
         });
@@ -193,6 +194,7 @@
         this.#bufferedAmount += d.size;
         core.jsonOpAsync("op_ws_send", {
           rid: this.#rid,
+          kind: "text",
           text: string,
         }).then(() => {
           this.#bufferedAmount -= d.size;
@@ -265,6 +267,13 @@
           event.target = this;
           this.dispatchEvent(event);
 
+          this.#eventLoop();
+        } else if (message.type === "ping") {
+          core.jsonOpAsync("op_ws_send", {
+            rid: this.#rid,
+            kind: "pong",
+          });
+
           this.#eventLoop();
         } else if (message.type === "close") {
           this.#readyState = CLOSED;
diff --git a/runtime/ops/websocket.rs b/runtime/ops/websocket.rs
index 812844f393..b220655ae6 100644
--- a/runtime/ops/websocket.rs
+++ b/runtime/ops/websocket.rs
@@ -216,6 +216,7 @@ pub async fn op_ws_create(
 #[serde(rename_all = "camelCase")]
 struct SendArgs {
   rid: u32,
+  kind: String,
   text: Option<String>,
 }
 
@@ -226,9 +227,11 @@ pub async fn op_ws_send(
 ) -> Result<Value, AnyError> {
   let args: SendArgs = serde_json::from_value(args)?;
 
-  let msg = match args.text {
-    Some(text) => Message::Text(text),
-    None => Message::Binary(bufs[0].to_vec()),
+  let msg = match args.kind.as_str() {
+    "text" => Message::Text(args.text.unwrap()),
+    "binary" => Message::Binary(bufs[0].to_vec()),
+    "pong" => Message::Pong(vec![]),
+    _ => unreachable!(),
   };
   let rid = args.rid;