diff --git a/mingw-w64-qtwebkit/0006-python-output-unix-line-endings.patch b/mingw-w64-qtwebkit/0006-python-output-unix-line-endings.patch
index 8fb47f0309..b3c733913a 100644
--- a/mingw-w64-qtwebkit/0006-python-output-unix-line-endings.patch
+++ b/mingw-w64-qtwebkit/0006-python-output-unix-line-endings.patch
@@ -1,33 +1,139 @@
---- qtwebkit-tp5/Source/WebCore/platform/network/create-http-header-name-table.orig	2017-02-07 23:28:00.520278300 +0300
-+++ qtwebkit-tp5/Source/WebCore/platform/network/create-http-header-name-table	2017-02-07 23:29:15.412561900 +0300
-@@ -54,7 +55,7 @@
+--- qtwebkit-5.212.0-alpha4/Source/WebCore/platform/network/create-http-header-name-table.orig	2020-03-04 09:16:37.000000000 -0800
++++ qtwebkit-5.212.0-alpha4/Source/WebCore/platform/network/create-http-header-name-table	2021-08-18 16:37:29.705107300 -0700
+@@ -54,8 +54,8 @@
  
  http_header_names.sort()
  
 -gperf_file = open('HTTPHeaderNames.gperf', 'w')
+-gperf_file.write('''
 +gperf_file = open('HTTPHeaderNames.gperf', 'wb')
- gperf_file.write('''
++gperf_file.write(b'''
  %{
  /*
---- qtwebkit-tp5/Source/WebCore/css/makeSelectorPseudoClassAndCompatibilityElementMap.py.orig	2017-02-08 00:23:27.256556700 +0300
-+++ qtwebkit-tp5/Source/WebCore/css/makeSelectorPseudoClassAndCompatibilityElementMap.py	2017-02-08 00:23:33.040887600 +0300
-@@ -57,7 +57,7 @@
+  * Copyright (C) 2014 Apple Inc. All rights reserved.
+@@ -105,11 +105,11 @@
+ ''')
+ 
+ for http_header_name in http_header_names:
+-    gperf_file.write('    { "%s", %u },\n' % (http_header_name, len(http_header_name)))
++    gperf_file.write(('    { "%s", %u },\n' % (http_header_name, len(http_header_name))).encode('ascii'))
+ 
+-gperf_file.write('};\n\n')
++gperf_file.write(b'};\n\n')
+ 
+-gperf_file.write('''
++gperf_file.write(b'''
+ %}
+ 
+ %language=C++
+@@ -131,9 +131,9 @@
+ ''')
+ 
+ for http_header_name in http_header_names:
+-    gperf_file.write('%s, HTTPHeaderName::%s\n' % (http_header_name, http_header_name_to_id[http_header_name]))
++    gperf_file.write(('%s, HTTPHeaderName::%s\n' % (http_header_name, http_header_name_to_id[http_header_name])).encode('ascii'))
+ 
+-gperf_file.write('''%%
++gperf_file.write(b'''%%
+ bool findHTTPHeaderName(StringView stringView, HTTPHeaderName& headerName)
+ {
+     unsigned length = stringView.length();
+--- qtwebkit-5.212.0-alpha4/Source/WebCore/css/makeSelectorPseudoClassAndCompatibilityElementMap.py.orig	2020-03-04 09:16:37.000000000 -0800
++++ qtwebkit-5.212.0-alpha4/Source/WebCore/css/makeSelectorPseudoClassAndCompatibilityElementMap.py	2021-08-18 16:40:37.434628000 -0700
+@@ -57,9 +57,9 @@
  def expand_ifdef_condition(condition):
      return condition.replace('(', '_').replace(')', '')
  
 -output_file = open('SelectorPseudoClassAndCompatibilityElementMap.gperf', 'w')
 +output_file = open('SelectorPseudoClassAndCompatibilityElementMap.gperf', 'wb')
  
- output_file.write("""
+-output_file.write("""
++output_file.write(b"""
  %{
---- qtwebkit-tp5/Source/WebCore/css/makeSelectorPseudoElementsMap.py.orig	2017-02-08 00:23:46.797674400 +0300
-+++ qtwebkit-tp5/Source/WebCore/css/makeSelectorPseudoElementsMap.py	2017-02-08 00:23:51.732956700 +0300
-@@ -57,7 +57,7 @@
+ /*
+  * Copyright (C) 2014 Apple Inc. All rights reserved.
+@@ -151,20 +151,20 @@
+     keyword_definition = line.split(',')
+     if len(keyword_definition) == 1:
+         keyword = keyword_definition[0].strip()
+-        output_file.write('"%s", {%s, CSSSelector::PseudoElementUnknown}\n' % (keyword, enumerablePseudoType(keyword)))
++        output_file.write(('"%s", {%s, CSSSelector::PseudoElementUnknown}\n' % (keyword, enumerablePseudoType(keyword))).encode('ascii'))
+     else:
+-        output_file.write('"%s", {CSSSelector::%s, CSSSelector::%s}\n' % (keyword_definition[0].strip(), keyword_definition[1].strip(), keyword_definition[2].strip()))
++        output_file.write(('"%s", {CSSSelector::%s, CSSSelector::%s}\n' % (keyword_definition[0].strip(), keyword_definition[1].strip(), keyword_definition[2].strip())).encode('ascii'))
+ 
+     longest_keyword = max(longest_keyword, len(keyword))
+ 
+-output_file.write("""%%
++output_file.write(b"""%%
+ 
+ static inline const SelectorPseudoClassOrCompatibilityPseudoElementEntry* parsePseudoClassAndCompatibilityElementString(const LChar* characters, unsigned length)
+ {
+     return SelectorPseudoClassAndCompatibilityElementMapHash::in_word_set(reinterpret_cast<const char*>(characters), length);
+ }""")
+ 
+-output_file.write("""
++output_file.write(("""
+ 
+ static inline const SelectorPseudoClassOrCompatibilityPseudoElementEntry* parsePseudoClassAndCompatibilityElementString(const UChar* characters, unsigned length)
+ {
+@@ -182,9 +182,9 @@
+     }
+     return parsePseudoClassAndCompatibilityElementString(buffer, length);
+ }
+-""" % longest_keyword)
++""" % longest_keyword).encode('ascii'))
+ 
+-output_file.write("""
++output_file.write(b"""
+ PseudoClassOrCompatibilityPseudoElement parsePseudoClassAndCompatibilityElementString(const CSSParserString& pseudoTypeString)
+ {
+     const SelectorPseudoClassOrCompatibilityPseudoElementEntry* entry;
+--- qtwebkit-5.212.0-alpha4/Source/WebCore/css/makeSelectorPseudoElementsMap.py.orig	2020-03-04 09:16:37.000000000 -0800
++++ qtwebkit-5.212.0-alpha4/Source/WebCore/css/makeSelectorPseudoElementsMap.py	2021-08-18 16:41:25.974582300 -0700
+@@ -57,9 +57,9 @@
  def expand_ifdef_condition(condition):
      return condition.replace('(', '_').replace(')', '')
  
 -output_file = open('SelectorPseudoElementTypeMap.gperf', 'w')
 +output_file = open('SelectorPseudoElementTypeMap.gperf', 'wb')
  
- output_file.write("""
+-output_file.write("""
++output_file.write(b"""
  %{
+ /*
+  * Copyright (C) 2014 Apple Inc. All rights reserved.
+@@ -153,10 +153,10 @@
+         keyword = keyword_definition[0].strip()
+         pseudo_element_enum_value = "CSSSelector::" + keyword_definition[1].strip()
+ 
+-    output_file.write('"%s", %s\n' % (keyword, pseudo_element_enum_value))
++    output_file.write(('"%s", %s\n' % (keyword, pseudo_element_enum_value)).encode('ascii'))
+     longest_keyword = max(longest_keyword, len(keyword))
+ 
+-output_file.write("""%%
++output_file.write(b"""%%
+ 
+ static inline CSSSelector::PseudoElementType parsePseudoElementString(const LChar* characters, unsigned length)
+ {
+@@ -165,7 +165,7 @@
+     return CSSSelector::PseudoElementUnknown;
+ }""")
+ 
+-output_file.write("""
++output_file.write(("""
+ 
+ static inline CSSSelector::PseudoElementType parsePseudoElementString(const UChar* characters, unsigned length)
+ {
+@@ -183,9 +183,9 @@
+     }
+     return parsePseudoElementString(buffer, length);
+ }
+-""" % longest_keyword)
++""" % longest_keyword).encode('ascii'))
+ 
+-output_file.write("""
++output_file.write(b"""
+ CSSSelector::PseudoElementType parsePseudoElementString(const StringImpl& pseudoTypeString)
+ {
+     if (pseudoTypeString.is8Bit())
diff --git a/mingw-w64-qtwebkit/0503-python3.patch b/mingw-w64-qtwebkit/0503-python3.patch
new file mode 100644
index 0000000000..1c0a9699f6
--- /dev/null
+++ b/mingw-w64-qtwebkit/0503-python3.patch
@@ -0,0 +1,11 @@
+--- qtwebkit-5.212.0-alpha4/Source/JavaScriptCore/generate-bytecode-files.bak	2021-08-18 14:51:40.575486700 -0700
++++ qtwebkit-5.212.0-alpha4/Source/JavaScriptCore/generate-bytecode-files	2021-08-18 14:53:56.356751200 -0700
+@@ -163,7 +163,7 @@
+         initBytecodesFile = openOrExit(initASMFileName, "w")
+ 
+     try:
+-        bytecodeSections = json.load(bytecodeFile, encoding = "utf-8")
++        bytecodeSections = json.load(bytecodeFile)
+     except:
+         print("Unexpected error parsing {0}: {1}".format(bytecodeJSONFile, sys.exc_info()))
+ 
diff --git a/mingw-w64-qtwebkit/PKGBUILD b/mingw-w64-qtwebkit/PKGBUILD
index adc26ad994..e1fef7c00f 100644
--- a/mingw-w64-qtwebkit/PKGBUILD
+++ b/mingw-w64-qtwebkit/PKGBUILD
@@ -46,11 +46,12 @@ source=(https://github.com/annulen/webkit/releases/download/qtwebkit-${_pkgver}/
         0300-fix-generating-module-files.patch
         0501-build-gcc9.patch
         0502-clang-compat.patch
+        0503-python3.patch
         d92b11fea65364fefa700249bd3340e0cd4c5b31.patch)
 sha256sums=('9ca126da9273664dd23a3ccd0c9bebceb7bb534bddd743db31caf6a5a6d4a9e6'
             'ed80d9a31cb1f9565841e3e206d76810881b7fce30210022270bd19694a9c906'
             'b9e39597d140f3fc40d07ae0f0eea0cbabd7b16d8e430d26445ae3063b8ad055'
-            '16410ad976524b40e7b9d906e67e4f46b86b58db6d7bb61e929f500387d7937f'
+            '02d0eb76207c4c2d36a50291976f8cc141fcff030c4b77c399402cd10a789b99'
             '9ef33dc05e5652362e10d34d75fd2cf9e7952c1c99306eb2402367401f86770b'
             'a1ef305a81b4e1b70290d4c3f70bee545f06c17736fe77abde474dba0df8c5c7'
             'c39b65235a61217bf4197285d21765a47a91d2e8c267f4b777c982d56d32b408'
@@ -61,6 +62,7 @@ sha256sums=('9ca126da9273664dd23a3ccd0c9bebceb7bb534bddd743db31caf6a5a6d4a9e6'
             '5ab5de5ee65fcd2a00412c8a2a1b2bbc4281d4ad99bac743757e6e8199a75ebe'
             'f6e85179e3581456cdfa9a00af537b4fb3caf0d66b14becc6592a15deba11175'
             '17bfe3bf5dde380b16198d9f63c7f74032c1fa7e8530047625f0f413d365a722'
+            'e0f0f5bb122f0473e650855c5d0dd26ea1a9da8ccbd74184a328c75a7f9e6081'
             'cc5a2b762426e9cda5a3ae056bba266b5f775ee75c0590913839c255d5f10db0')
 
 # Helper macros to help make tasks easier #
@@ -93,7 +95,8 @@ prepare() {
   apply_patch_with_msg \
     0300-fix-generating-module-files.patch \
     0501-build-gcc9.patch \
-    0502-clang-compat.patch
+    0502-clang-compat.patch \
+    0503-python3.patch
 
   # Fix build with bison 3.7+
   apply_patch_with_msg \