diff --git a/browsers.json b/browsers.json
index 17ed046255..75813fddfd 100644
--- a/browsers.json
+++ b/browsers.json
@@ -23,7 +23,7 @@
     },
     {
       "name": "webkit",
-      "revision": "1535",
+      "revision": "1538",
       "installByDefault": true,
       "revisionOverrides": {
         "mac10.14": "1446"
diff --git a/src/server/webkit/protocol.d.ts b/src/server/webkit/protocol.d.ts
index 53e244de92..2a8e0bf3cf 100644
--- a/src/server/webkit/protocol.d.ts
+++ b/src/server/webkit/protocol.d.ts
@@ -536,7 +536,7 @@ export module Protocol {
     /**
      * Pseudo-style identifier (see <code>enum PseudoId</code> in <code>RenderStyleConstants.h</code>).
      */
-    export type PseudoId = "first-line"|"first-letter"|"highlight"|"marker"|"before"|"after"|"selection"|"scrollbar"|"scrollbar-thumb"|"scrollbar-button"|"scrollbar-track"|"scrollbar-track-piece"|"scrollbar-corner"|"resizer";
+    export type PseudoId = "first-line"|"first-letter"|"highlight"|"marker"|"before"|"after"|"selection"|"backdrop"|"scrollbar"|"scrollbar-thumb"|"scrollbar-button"|"scrollbar-track"|"scrollbar-track-piece"|"scrollbar-corner"|"resizer";
     /**
      * CSS rule collection for a single pseudo style.
      */
@@ -6902,6 +6902,13 @@ the top of the viewport and Y increases as it proceeds towards the bottom of the
     }
     export type setVisibleContentRectsReturnValue = {
     }
+    /**
+     * Ensures that the scroll regions are up to date.
+     */
+    export type updateScrollingStateParameters = {
+    }
+    export type updateScrollingStateReturnValue = {
+    }
   }
   
   export module Playwright {
@@ -9048,6 +9055,7 @@ the top of the viewport and Y increases as it proceeds towards the bottom of the
     "Page.crash": Page.crashParameters;
     "Page.setOrientationOverride": Page.setOrientationOverrideParameters;
     "Page.setVisibleContentRects": Page.setVisibleContentRectsParameters;
+    "Page.updateScrollingState": Page.updateScrollingStateParameters;
     "Playwright.enable": Playwright.enableParameters;
     "Playwright.disable": Playwright.disableParameters;
     "Playwright.close": Playwright.closeParameters;
@@ -9347,6 +9355,7 @@ the top of the viewport and Y increases as it proceeds towards the bottom of the
     "Page.crash": Page.crashReturnValue;
     "Page.setOrientationOverride": Page.setOrientationOverrideReturnValue;
     "Page.setVisibleContentRects": Page.setVisibleContentRectsReturnValue;
+    "Page.updateScrollingState": Page.updateScrollingStateReturnValue;
     "Playwright.enable": Playwright.enableReturnValue;
     "Playwright.disable": Playwright.disableReturnValue;
     "Playwright.close": Playwright.closeReturnValue;