diff --git a/.changeset/tame-humans-sleep.md b/.changeset/tame-humans-sleep.md
new file mode 100644
index 00000000..38927327
--- /dev/null
+++ b/.changeset/tame-humans-sleep.md
@@ -0,0 +1,5 @@
+---
+'nxjs-runtime': patch
+---
+
+Use Promise introspection APIs from updated QuickJS fork
diff --git a/source/main.c b/source/main.c
index 85d0ae02..60ea400d 100644
--- a/source/main.c
+++ b/source/main.c
@@ -337,12 +337,12 @@ static JSValue js_env_to_object(JSContext *ctx, JSValueConst this_val, int argc,
 // Returns the internal state of a Promise instance.
 static JSValue js_get_internal_promise_state(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv)
 {
-    JSPromiseData *promise_data = JS_GetOpaque(argv[0], JS_CLASS_PROMISE);
+    JSPromiseStateEnum state = JS_GetPromiseState(ctx, argv[0]);
     JSValue arr = JS_NewArray(ctx);
-    JS_SetPropertyUint32(ctx, arr, 0, JS_NewInt32(ctx, promise_data->promise_state));
-    if (promise_data->promise_state > 0)
+    JS_SetPropertyUint32(ctx, arr, 0, JS_NewUint32(ctx, state));
+    if (state > JS_PROMISE_PENDING)
     {
-        JS_SetPropertyUint32(ctx, arr, 1, promise_data->promise_result);
+        JS_SetPropertyUint32(ctx, arr, 1, JS_GetPromiseResult(ctx, argv[0]));
     }
     else
     {
diff --git a/source/types.h b/source/types.h
index 5eda9a4d..db9da256 100644
--- a/source/types.h
+++ b/source/types.h
@@ -54,30 +54,3 @@ inline nx_context_t *nx_get_context(JSContext *ctx)
 {
     return JS_GetContextOpaque(ctx);
 }
-
-// DANGER: Internal Promise state from `quickjs.c`.
-// Verify that this is still accurate if/when QuickJS
-// ever gets updated.
-#define JS_CLASS_PROMISE 49
-
-struct list_head
-{
-    struct list_head *prev;
-    struct list_head *next;
-};
-
-typedef enum JSPromiseStateEnum
-{
-    JS_PROMISE_PENDING,
-    JS_PROMISE_FULFILLED,
-    JS_PROMISE_REJECTED,
-} JSPromiseStateEnum;
-
-typedef struct JSPromiseData
-{
-    JSPromiseStateEnum promise_state;
-    /* 0=fulfill, 1=reject, list of JSPromiseReactionData.link */
-    struct list_head promise_reactions[2];
-    BOOL is_handled; /* Note: only useful to debug */
-    JSValue promise_result;
-} JSPromiseData;