diff --git a/lib/tokenize_rt.py b/lib/tokenize_rt.py
index b225a9f0..f0922c16 100644
--- a/lib/tokenize_rt.py
+++ b/lib/tokenize_rt.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import argparse
 import io
 import keyword
@@ -6,20 +8,17 @@ import sys
 import tokenize
 from typing import Generator
 from typing import Iterable
-from typing import List
 from typing import NamedTuple
-from typing import Optional
 from typing import Pattern
 from typing import Sequence
-from typing import Tuple
 
 # this is a performance hack.  see https://bugs.python.org/issue43014
-if (
+if (  # pragma: no branch
         sys.version_info < (3, 10) and
         callable(getattr(tokenize, '_compile', None))
-):  # pragma: no cover (<py310)
+):  # pragma: <3.10 cover
     from functools import lru_cache
-    tokenize._compile = lru_cache()(tokenize._compile)  # type: ignore
+    tokenize._compile = lru_cache()(tokenize._compile)
 
 ESCAPED_NL = 'ESCAPED_NL'
 UNIMPORTANT_WS = 'UNIMPORTANT_WS'
@@ -27,15 +26,15 @@ NON_CODING_TOKENS = frozenset(('COMMENT', ESCAPED_NL, 'NL', UNIMPORTANT_WS))
 
 
 class Offset(NamedTuple):
-    line: Optional[int] = None
-    utf8_byte_offset: Optional[int] = None
+    line: int | None = None
+    utf8_byte_offset: int | None = None
 
 
 class Token(NamedTuple):
     name: str
     src: str
-    line: Optional[int] = None
-    utf8_byte_offset: Optional[int] = None
+    line: int | None = None
+    utf8_byte_offset: int | None = None
 
     @property
     def offset(self) -> Offset:
@@ -43,11 +42,10 @@ class Token(NamedTuple):
 
 
 _string_re = re.compile('^([^\'"]*)(.*)$', re.DOTALL)
-_string_prefixes = frozenset('bfru')
 _escaped_nl_re = re.compile(r'\\(\n|\r\n|\r)')
 
 
-def _re_partition(regex: Pattern[str], s: str) -> Tuple[str, str, str]:
+def _re_partition(regex: Pattern[str], s: str) -> tuple[str, str, str]:
     match = regex.search(s)
     if match:
         return s[:match.start()], s[slice(*match.span())], s[match.end():]
@@ -55,7 +53,7 @@ def _re_partition(regex: Pattern[str], s: str) -> Tuple[str, str, str]:
         return (s, '', '')
 
 
-def src_to_tokens(src: str) -> List[Token]:
+def src_to_tokens(src: str) -> list[Token]:
     tokenize_target = io.StringIO(src)
     lines = ('',) + tuple(tokenize_target)
 
@@ -98,33 +96,7 @@ def src_to_tokens(src: str) -> List[Token]:
             end_offset += len(newtok.encode())
 
         tok_name = tokenize.tok_name[tok_type]
-        # when a string prefix is not recognized, the tokenizer produces a
-        # NAME token followed by a STRING token
-        if (
-                tok_name == 'STRING' and
-                tokens and
-                tokens[-1].name == 'NAME' and
-                frozenset(tokens[-1].src.lower()) <= _string_prefixes
-        ):
-            newsrc = tokens[-1].src + tok_text
-            tokens[-1] = tokens[-1]._replace(src=newsrc, name=tok_name)
-        # produce octal literals as a single token in python 3 as well
-        elif (
-                tok_name == 'NUMBER' and
-                tokens and
-                tokens[-1].name == 'NUMBER'
-        ):
-            tokens[-1] = tokens[-1]._replace(src=tokens[-1].src + tok_text)
-        # produce long literals as a single token in python 3 as well
-        elif (
-                tok_name == 'NAME' and
-                tok_text.lower() == 'l' and
-                tokens and
-                tokens[-1].name == 'NUMBER'
-        ):
-            tokens[-1] = tokens[-1]._replace(src=tokens[-1].src + tok_text)
-        else:
-            tokens.append(Token(tok_name, tok_text, sline, end_offset))
+        tokens.append(Token(tok_name, tok_text, sline, end_offset))
         last_line, last_col = eline, ecol
         if sline != eline:
             end_offset = len(lines[last_line][:last_col].encode())
@@ -140,19 +112,19 @@ def tokens_to_src(tokens: Iterable[Token]) -> str:
 
 def reversed_enumerate(
         tokens: Sequence[Token],
-) -> Generator[Tuple[int, Token], None, None]:
+) -> Generator[tuple[int, Token], None, None]:
     for i in reversed(range(len(tokens))):
         yield i, tokens[i]
 
 
-def parse_string_literal(src: str) -> Tuple[str, str]:
+def parse_string_literal(src: str) -> tuple[str, str]:
     """parse a string literal's source into (prefix, string)"""
     match = _string_re.match(src)
     assert match is not None
     return match.group(1), match.group(2)
 
 
-def rfind_string_parts(tokens: Sequence[Token], i: int) -> Tuple[int, ...]:
+def rfind_string_parts(tokens: Sequence[Token], i: int) -> tuple[int, ...]:
     """find the indicies of the string parts of a (joined) string literal
 
     - `i` should start at the end of the string literal
@@ -195,7 +167,7 @@ def rfind_string_parts(tokens: Sequence[Token], i: int) -> Tuple[int, ...]:
     return tuple(reversed(ret))
 
 
-def main(argv: Optional[Sequence[str]] = None) -> int:
+def main(argv: Sequence[str] | None = None) -> int:
     parser = argparse.ArgumentParser()
     parser.add_argument('filename')
     args = parser.parse_args(argv)
@@ -210,4 +182,4 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
 
 
 if __name__ == '__main__':
-    exit(main())
+    raise SystemExit(main())
diff --git a/requirements.txt b/requirements.txt
index 17d503fd..cff0f4b1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -42,7 +42,7 @@ simplejson==3.17.6
 six==1.16.0
 soupsieve==2.3.2.post1
 tempora==5.0.2
-tokenize-rt==4.2.1
+tokenize-rt==5.0.0
 tzdata==2022.6
 tzlocal==4.2
 urllib3==1.26.12