diff --git a/tools/dev/update_user_agent_strings.py b/tools/dev/update_user_agent_strings.py
deleted file mode 100644
index 92da521239db..000000000000
--- a/tools/dev/update_user_agent_strings.py
+++ /dev/null
@@ -1,56 +0,0 @@
-#!/usr/bin/python3
-import requests
-import re
-
-def replace_agent_string(lines, replace_marker, url, regex):
-  VALID_CHARS = 'a-zA-Z0-9\\(\\);:\\.,/_ '
-  regex = regex.replace('{VALID_CHARS}', VALID_CHARS)
-  print(f'Updating {replace_marker}')
-  for x in range(0, len(lines)):
-    if replace_marker in lines[x]:
-      break
-  else:
-    raise RuntimeError(f"Couldn't find marker {replace_marker}")
-
-  response = requests.get(url)
-  if response.status_code != 200:
-    raise RuntimeError(f"Can't retrieve {url}")
-
-  match = re.search(regex, response.text)
-  if match is None:
-    raise RuntimeError(f"Couldn't match regex {regex}")
-
-  new_string = match.groups()[0]
-  print(f'New value is: {new_string}')
-  old_line = lines[x]
-  if f"'{new_string}'" in old_line:
-    print('(This is unchanged from the previous value)')
-  else:
-    new_line = re.sub("'(.*)'", f"'{new_string}'", old_line)
-    if old_line == new_line:
-      raise RuntimeError(f"Line didn't change: {old_line}")
-
-    lines[x] = new_line
-
-
-chrome_url = "https://www.whatismybrowser.com/guides/the-latest-user-agent/chrome"
-edge_url = "https://www.whatismybrowser.com/guides/the-latest-user-agent/edge"
-safari_url = "https://www.whatismybrowser.com/guides/the-latest-user-agent/safari"
-firefox_url = "https://www.whatismybrowser.com/guides/the-latest-user-agent/firefox"
-
-user_agent_filename = 'lib/rex/user_agent.rb'
-with open(user_agent_filename,'r') as f:
-  lines = f.read().splitlines()
-
-replace_agent_string(lines, 'Chrome Windows', chrome_url, '<td>Chrome \\(Standard\\)</td>\\s*<td>\\s*<ul>\\s*<li><span class="code">([{VALID_CHARS}]*Windows NT[{VALID_CHARS}]*)</span>')
-replace_agent_string(lines, 'Chrome MacOS', chrome_url, '<td>Chrome \\(Standard\\)</td>\\s*<td>\\s*<ul>\\s*<li><span class="code">([{VALID_CHARS}]*Macintosh[{VALID_CHARS}]*)</span>')
-replace_agent_string(lines, 'Edge Windows', edge_url, '<td>Edge \\(Standard\\)</td>\\s*<td>\\s*<ul>\\s*<li><span class="code">([{VALID_CHARS}]*Windows NT[{VALID_CHARS}]*)</span>')
-replace_agent_string(lines, 'Safari iPad', safari_url, '<td>\\s*Safari on <b>Ipad</b>\\s*</td>\\s*<td>\\s*<ul>\\s*<li><span class="code">([{VALID_CHARS}]*iPad[{VALID_CHARS}]*)</span>')
-replace_agent_string(lines, 'Safari MacOS', safari_url, '<td>Safari \\(Standard\\)</td>\\s*<td>\\s*<ul>\\s*<li><span class="code">([{VALID_CHARS}]*Macintosh[{VALID_CHARS}]*)</span>')
-replace_agent_string(lines, 'Firefox Windows', firefox_url, '<td>\\s*Firefox on <b>Windows</b>\\s*</td>\\s*<td>\\s*<ul>\\s*<li><span class="code">([{VALID_CHARS}]*Windows NT[{VALID_CHARS}]*)</span>')
-replace_agent_string(lines, 'Firefox MacOS', firefox_url, '<td>\\s*Firefox on <b>Macos</b>\\s*</td>\\s*<td>\\s*<ul>\\s*<li><span class="code">([{VALID_CHARS}]*Macintosh[{VALID_CHARS}]*)</span>')
-
-with open(user_agent_filename, 'w') as f:
-  f.write('\n'.join(lines) + '\n')
-
-print('Done')