diff --git a/browser_patches/webkit/BUILD_NUMBER b/browser_patches/webkit/BUILD_NUMBER
index 4d9cfa2903..049eb5eb39 100644
--- a/browser_patches/webkit/BUILD_NUMBER
+++ b/browser_patches/webkit/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1483
-Changed: yurys@chromium.org Mon 24 May 2021 12:26:08 PM PDT
+1484
+Changed: yurys@chromium.org Mon 24 May 2021 02:43:11 PM PDT
diff --git a/browser_patches/webkit/patches/bootstrap.diff b/browser_patches/webkit/patches/bootstrap.diff
index 30a8c8a3de..70b308d056 100644
--- a/browser_patches/webkit/patches/bootstrap.diff
+++ b/browser_patches/webkit/patches/bootstrap.diff
@@ -11965,10 +11965,10 @@ index 0000000000000000000000000000000000000000..4ec8b96bbbddf8a7b042f53a8068754a
 +cairo_status_t cairo_image_surface_write_to_jpeg_mem(cairo_surface_t *sfc, unsigned char **data, size_t *len, int quality);
 diff --git a/Source/WebKit/UIProcess/Inspector/Agents/InspectorScreencastAgent.cpp b/Source/WebKit/UIProcess/Inspector/Agents/InspectorScreencastAgent.cpp
 new file mode 100644
-index 0000000000000000000000000000000000000000..911f4f8f3eb0aa66fe6d11bb46a5f836febc5c60
+index 0000000000000000000000000000000000000000..b30668cc6dfc1d090600980d9ff1da5ed52902aa
 --- /dev/null
 +++ b/Source/WebKit/UIProcess/Inspector/Agents/InspectorScreencastAgent.cpp
-@@ -0,0 +1,272 @@
+@@ -0,0 +1,271 @@
 +/*
 + * Copyright (C) 2020 Microsoft Corporation.
 + *
@@ -12219,10 +12219,9 @@ index 0000000000000000000000000000000000000000..911f4f8f3eb0aa66fe6d11bb46a5f836
 +        }
 +        auto cfData = adoptCF(CFDataCreateMutable(kCFAllocatorDefault, 0));
 +        WebCore::encodeImage(imagePtr, CFSTR("public.jpeg"), m_screencastQuality * 0.1, cfData.get());
-+        Vector<char> base64Data;
-+        base64Encode(CFDataGetBytePtr(cfData.get()), CFDataGetLength(cfData.get()), base64Data);
++        String base64Data = base64EncodeToString(CFDataGetBytePtr(cfData.get()), CFDataGetLength(cfData.get()));
 +        ++m_screencastFramesInFlight;
-+        m_frontendDispatcher->screencastFrame(String(base64Data.data(), base64Data.size()), displaySize.width(), displaySize.height());
++        m_frontendDispatcher->screencastFrame(base64Data, displaySize.width(), displaySize.height());
 +    }
 +    if (m_encoder)
 +        m_encoder->encodeFrame(WTFMove(imageRef));
diff --git a/tests/chromium/js-coverage.spec.ts b/tests/chromium/js-coverage.spec.ts
index 5a9bebe0b6..a6f5cea61b 100644
--- a/tests/chromium/js-coverage.spec.ts
+++ b/tests/chromium/js-coverage.spec.ts
@@ -16,10 +16,11 @@
 
 import { contextTest as it, expect } from '../config/browserTest';
 
-it('should work', async function({page, server}) {
+it.only('should work', async function({page, server}) {
   await page.coverage.startJSCoverage();
-  await page.goto(server.PREFIX + '/jscoverage/simple.html', { waitUntil: 'load' });
+  await page.goto(server.PREFIX + '/jscoverag e/simple.html', { waitUntil: 'load' });
   const coverage = await page.coverage.stopJSCoverage();
+  console.log(JSON.stringify(coverage, null, 2));
   expect(coverage.length).toBe(1);
   expect(coverage[0].url).toContain('/jscoverage/simple.html');
   expect(coverage[0].functions.find(f => f.functionName === 'foo').ranges[0].count).toEqual(1);