diff --git a/src/trix/controllers/level_2_input_controller.js b/src/trix/controllers/level_2_input_controller.js
index 65b302157..5cf79c840 100644
--- a/src/trix/controllers/level_2_input_controller.js
+++ b/src/trix/controllers/level_2_input_controller.js
@@ -1,4 +1,4 @@
-import { getAllAttributeNames, squishBreakableWhitespace } from "trix/core/helpers"
+import { getAllAttributeNames, shouldRenderInmmediately, squishBreakableWhitespace } from "trix/core/helpers"
 import InputController from "trix/controllers/input_controller"
 import * as config from "trix/config"
 
@@ -80,7 +80,12 @@ export default class Level2InputController extends InputController {
 
       if (handler) {
         this.withEvent(event, handler)
-        this.scheduleRender()
+
+        if (shouldRenderInmmediately(event)) {
+          this.render()
+        } else {
+          this.scheduleRender()
+        }
       }
     },
 
diff --git a/src/trix/core/helpers/events.js b/src/trix/core/helpers/events.js
index 4248830d3..3c36f1cc5 100644
--- a/src/trix/core/helpers/events.js
+++ b/src/trix/core/helpers/events.js
@@ -43,3 +43,16 @@ export const keyEventIsKeyboardCommand = (function() {
     return (event) => event.ctrlKey
   }
 })()
+
+export function shouldRenderInmmediately(inputEvent) {
+  if (/iPhone|iPad/i.test(navigator.userAgent)) {
+    // Handle duplicated newlines when using dictation on iOS 18+. Upon dictation completion, iOS sends
+    // the list of insertText / insertParagraph events in a quick sequence. For newlines, if we don't render
+    // the editor synchronously, the internal range fails to update and results in duplicated newlines.
+    // This workaround is necessary because iOS doesn't send composing events as expected while dictating:
+    // https://bugs.webkit.org/show_bug.cgi?id=261764
+    return inputEvent.inputType === "insertParagraph"
+  } else {
+    return false
+  }
+}