diff --git a/src/_pytest/_code/code.py b/src/_pytest/_code/code.py
index bd2132a9a..7da5cb3d1 100644
--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -1,3 +1,4 @@
+import ast
 import inspect
 import re
 import sys
@@ -12,6 +13,7 @@ from types import FrameType
 from types import TracebackType
 from typing import Any
 from typing import Callable
+from typing import ClassVar
 from typing import Dict
 from typing import Generic
 from typing import Iterable
@@ -238,7 +240,9 @@ class TracebackEntry:
     def getfirstlinesource(self) -> int:
         return self.frame.code.firstlineno
 
-    def getsource(self, astcache=None) -> Optional["Source"]:
+    def getsource(
+        self, astcache: Optional[Dict[Union[str, Path], ast.AST]] = None
+    ) -> Optional["Source"]:
         """Return failing source code."""
         # we use the passed in astcache to not reparse asttrees
         # within exception info printing
@@ -258,7 +262,7 @@ class TracebackEntry:
         except SyntaxError:
             end = self.lineno + 1
         else:
-            if key is not None:
+            if key is not None and astcache is not None:
                 astcache[key] = astnode
         return source[start:end]
 
@@ -435,15 +439,15 @@ E = TypeVar("E", bound=BaseException, covariant=True)
 
 
 @final
-@attr.s(repr=False, init=False)
+@attr.s(repr=False, init=False, auto_attribs=True)
 class ExceptionInfo(Generic[E]):
     """Wraps sys.exc_info() objects and offers help for navigating the traceback."""
 
-    _assert_start_repr = "AssertionError('assert "
+    _assert_start_repr: ClassVar = "AssertionError('assert "
 
-    _excinfo = attr.ib(type=Optional[Tuple[Type["E"], "E", TracebackType]])
-    _striptext = attr.ib(type=str)
-    _traceback = attr.ib(type=Optional[Traceback])
+    _excinfo: Optional[Tuple[Type["E"], "E", TracebackType]]
+    _striptext: str
+    _traceback: Optional[Traceback]
 
     def __init__(
         self,
@@ -673,22 +677,24 @@ class ExceptionInfo(Generic[E]):
         return True
 
 
-@attr.s
+@attr.s(auto_attribs=True)
 class FormattedExcinfo:
     """Presenting information about failing Functions and Generators."""
 
     # for traceback entries
-    flow_marker = ">"
-    fail_marker = "E"
+    flow_marker: ClassVar = ">"
+    fail_marker: ClassVar = "E"
 
-    showlocals = attr.ib(type=bool, default=False)
-    style = attr.ib(type="_TracebackStyle", default="long")
-    abspath = attr.ib(type=bool, default=True)
-    tbfilter = attr.ib(type=bool, default=True)
-    funcargs = attr.ib(type=bool, default=False)
-    truncate_locals = attr.ib(type=bool, default=True)
-    chain = attr.ib(type=bool, default=True)
-    astcache = attr.ib(default=attr.Factory(dict), init=False, repr=False)
+    showlocals: bool = False
+    style: "_TracebackStyle" = "long"
+    abspath: bool = True
+    tbfilter: bool = True
+    funcargs: bool = False
+    truncate_locals: bool = True
+    chain: bool = True
+    astcache: Dict[Union[str, Path], ast.AST] = attr.ib(
+        factory=dict, init=False, repr=False
+    )
 
     def _getindent(self, source: "Source") -> int:
         # Figure out indent for the given source.
@@ -951,7 +957,7 @@ class FormattedExcinfo:
         return ExceptionChainRepr(repr_chain)
 
 
-@attr.s(eq=False)
+@attr.s(eq=False, auto_attribs=True)
 class TerminalRepr:
     def __str__(self) -> str:
         # FYI this is called from pytest-xdist's serialization of exception
@@ -987,13 +993,9 @@ class ExceptionRepr(TerminalRepr):
             tw.line(content)
 
 
-@attr.s(eq=False)
+@attr.s(eq=False, auto_attribs=True)
 class ExceptionChainRepr(ExceptionRepr):
-    chain = attr.ib(
-        type=Sequence[
-            Tuple["ReprTraceback", Optional["ReprFileLocation"], Optional[str]]
-        ]
-    )
+    chain: Sequence[Tuple["ReprTraceback", Optional["ReprFileLocation"], Optional[str]]]
 
     def __attrs_post_init__(self) -> None:
         super().__attrs_post_init__()
@@ -1011,23 +1013,23 @@ class ExceptionChainRepr(ExceptionRepr):
         super().toterminal(tw)
 
 
-@attr.s(eq=False)
+@attr.s(eq=False, auto_attribs=True)
 class ReprExceptionInfo(ExceptionRepr):
-    reprtraceback = attr.ib(type="ReprTraceback")
-    reprcrash = attr.ib(type="ReprFileLocation")
+    reprtraceback: "ReprTraceback"
+    reprcrash: "ReprFileLocation"
 
     def toterminal(self, tw: TerminalWriter) -> None:
         self.reprtraceback.toterminal(tw)
         super().toterminal(tw)
 
 
-@attr.s(eq=False)
+@attr.s(eq=False, auto_attribs=True)
 class ReprTraceback(TerminalRepr):
-    reprentries = attr.ib(type=Sequence[Union["ReprEntry", "ReprEntryNative"]])
-    extraline = attr.ib(type=Optional[str])
-    style = attr.ib(type="_TracebackStyle")
+    reprentries: Sequence[Union["ReprEntry", "ReprEntryNative"]]
+    extraline: Optional[str]
+    style: "_TracebackStyle"
 
-    entrysep = "_ "
+    entrysep: ClassVar = "_ "
 
     def toterminal(self, tw: TerminalWriter) -> None:
         # The entries might have different styles.
@@ -1055,22 +1057,23 @@ class ReprTracebackNative(ReprTraceback):
         self.extraline = None
 
 
-@attr.s(eq=False)
+@attr.s(eq=False, auto_attribs=True)
 class ReprEntryNative(TerminalRepr):
-    lines = attr.ib(type=Sequence[str])
-    style: "_TracebackStyle" = "native"
+    lines: Sequence[str]
+
+    style: ClassVar["_TracebackStyle"] = "native"
 
     def toterminal(self, tw: TerminalWriter) -> None:
         tw.write("".join(self.lines))
 
 
-@attr.s(eq=False)
+@attr.s(eq=False, auto_attribs=True)
 class ReprEntry(TerminalRepr):
-    lines = attr.ib(type=Sequence[str])
-    reprfuncargs = attr.ib(type=Optional["ReprFuncArgs"])
-    reprlocals = attr.ib(type=Optional["ReprLocals"])
-    reprfileloc = attr.ib(type=Optional["ReprFileLocation"])
-    style = attr.ib(type="_TracebackStyle")
+    lines: Sequence[str]
+    reprfuncargs: Optional["ReprFuncArgs"]
+    reprlocals: Optional["ReprLocals"]
+    reprfileloc: Optional["ReprFileLocation"]
+    style: "_TracebackStyle"
 
     def _write_entry_lines(self, tw: TerminalWriter) -> None:
         """Write the source code portions of a list of traceback entries with syntax highlighting.
@@ -1144,11 +1147,11 @@ class ReprEntry(TerminalRepr):
         )
 
 
-@attr.s(eq=False)
+@attr.s(eq=False, auto_attribs=True)
 class ReprFileLocation(TerminalRepr):
-    path = attr.ib(type=str, converter=str)
-    lineno = attr.ib(type=int)
-    message = attr.ib(type=str)
+    path: str = attr.ib(converter=str)
+    lineno: int
+    message: str
 
     def toterminal(self, tw: TerminalWriter) -> None:
         # Filename and lineno output for each entry, using an output format
@@ -1161,18 +1164,18 @@ class ReprFileLocation(TerminalRepr):
         tw.line(f":{self.lineno}: {msg}")
 
 
-@attr.s(eq=False)
+@attr.s(eq=False, auto_attribs=True)
 class ReprLocals(TerminalRepr):
-    lines = attr.ib(type=Sequence[str])
+    lines: Sequence[str]
 
     def toterminal(self, tw: TerminalWriter, indent="") -> None:
         for line in self.lines:
             tw.line(indent + line)
 
 
-@attr.s(eq=False)
+@attr.s(eq=False, auto_attribs=True)
 class ReprFuncArgs(TerminalRepr):
-    args = attr.ib(type=Sequence[Tuple[str, object]])
+    args: Sequence[Tuple[str, object]]
 
     def toterminal(self, tw: TerminalWriter) -> None:
         if self.args:
diff --git a/src/_pytest/cacheprovider.py b/src/_pytest/cacheprovider.py
index f75dfde45..b3a10882d 100755
--- a/src/_pytest/cacheprovider.py
+++ b/src/_pytest/cacheprovider.py
@@ -55,10 +55,10 @@ Signature: 8a477f597d28d172789f06886806bc55
 
 
 @final
-@attr.s(init=False)
+@attr.s(init=False, auto_attribs=True)
 class Cache:
-    _cachedir = attr.ib(type=Path, repr=False)
-    _config = attr.ib(type=Config, repr=False)
+    _cachedir: Path = attr.ib(repr=False)
+    _config: Config = attr.ib(repr=False)
 
     # Sub-directory under cache-dir for directories created by `mkdir()`.
     _CACHE_PREFIX_DIRS = "d"
diff --git a/src/_pytest/config/__init__.py b/src/_pytest/config/__init__.py
index de5b80e30..1f98484d5 100644
--- a/src/_pytest/config/__init__.py
+++ b/src/_pytest/config/__init__.py
@@ -858,7 +858,7 @@ class Config:
     """
 
     @final
-    @attr.s(frozen=True)
+    @attr.s(frozen=True, auto_attribs=True)
     class InvocationParams:
         """Holds parameters passed during :func:`pytest.main`.
 
@@ -874,21 +874,12 @@ class Config:
             Plugins accessing ``InvocationParams`` must be aware of that.
         """
 
-        args = attr.ib(type=Tuple[str, ...], converter=_args_converter)
-        """The command-line arguments as passed to :func:`pytest.main`.
-
-        :type: Tuple[str, ...]
-        """
-        plugins = attr.ib(type=Optional[Sequence[Union[str, _PluggyPlugin]]])
-        """Extra plugins, might be `None`.
-
-        :type: Optional[Sequence[Union[str, plugin]]]
-        """
-        dir = attr.ib(type=Path)
-        """The directory from which :func:`pytest.main` was invoked.
-
-        :type: pathlib.Path
-        """
+        args: Tuple[str, ...] = attr.ib(converter=_args_converter)
+        """The command-line arguments as passed to :func:`pytest.main`."""
+        plugins: Optional[Sequence[Union[str, _PluggyPlugin]]]
+        """Extra plugins, might be `None`."""
+        dir: Path
+        """The directory from which :func:`pytest.main` was invoked."""
 
     def __init__(
         self,
diff --git a/src/_pytest/fixtures.py b/src/_pytest/fixtures.py
index de27abdb7..bcb53552a 100644
--- a/src/_pytest/fixtures.py
+++ b/src/_pytest/fixtures.py
@@ -393,16 +393,16 @@ def get_direct_param_fixture_func(request):
     return request.param
 
 
-@attr.s(slots=True)
+@attr.s(slots=True, auto_attribs=True)
 class FuncFixtureInfo:
     # Original function argument names.
-    argnames = attr.ib(type=Tuple[str, ...])
+    argnames: Tuple[str, ...]
     # Argnames that function immediately requires. These include argnames +
     # fixture names specified via usefixtures and via autouse=True in fixture
     # definitions.
-    initialnames = attr.ib(type=Tuple[str, ...])
-    names_closure = attr.ib(type=List[str])
-    name2fixturedefs = attr.ib(type=Dict[str, Sequence["FixtureDef[Any]"]])
+    initialnames: Tuple[str, ...]
+    names_closure: List[str]
+    name2fixturedefs: Dict[str, Sequence["FixtureDef[Any]"]]
 
     def prune_dependency_tree(self) -> None:
         """Recompute names_closure from initialnames and name2fixturedefs.
@@ -1187,11 +1187,11 @@ def wrap_function_to_error_out_if_called_directly(
 
 
 @final
-@attr.s(frozen=True)
+@attr.s(frozen=True, auto_attribs=True)
 class FixtureFunctionMarker:
-    scope: "Union[_ScopeName, Callable[[str, Config], _ScopeName]]" = attr.ib()
+    scope: "Union[_ScopeName, Callable[[str, Config], _ScopeName]]"
     params: Optional[Tuple[object, ...]] = attr.ib(converter=_params_converter)
-    autouse: bool = attr.ib(default=False)
+    autouse: bool = False
     ids: Union[
         Tuple[Union[None, str, float, int, bool], ...],
         Callable[[Any], Optional[object]],
@@ -1199,7 +1199,7 @@ class FixtureFunctionMarker:
         default=None,
         converter=_ensure_immutable_ids,
     )
-    name: Optional[str] = attr.ib(default=None)
+    name: Optional[str] = None
 
     def __call__(self, function: FixtureFunction) -> FixtureFunction:
         if inspect.isclass(function):
diff --git a/src/_pytest/main.py b/src/_pytest/main.py
index 6bfd54c39..cfdc091e1 100644
--- a/src/_pytest/main.py
+++ b/src/_pytest/main.py
@@ -442,9 +442,9 @@ class Failed(Exception):
     """Signals a stop as failed test run."""
 
 
-@attr.s
+@attr.s(slots=True, auto_attribs=True)
 class _bestrelpath_cache(Dict[Path, str]):
-    path = attr.ib(type=Path)
+    path: Path
 
     def __missing__(self, path: Path) -> str:
         r = bestrelpath(self.path, path)
diff --git a/src/_pytest/mark/__init__.py b/src/_pytest/mark/__init__.py
index a16654c78..34d7726e6 100644
--- a/src/_pytest/mark/__init__.py
+++ b/src/_pytest/mark/__init__.py
@@ -133,7 +133,7 @@ def pytest_cmdline_main(config: Config) -> Optional[Union[int, ExitCode]]:
     return None
 
 
-@attr.s(slots=True)
+@attr.s(slots=True, auto_attribs=True)
 class KeywordMatcher:
     """A matcher for keywords.
 
@@ -148,7 +148,7 @@ class KeywordMatcher:
     any item, as well as names directly assigned to test functions.
     """
 
-    _names = attr.ib(type=AbstractSet[str])
+    _names: AbstractSet[str]
 
     @classmethod
     def from_item(cls, item: "Item") -> "KeywordMatcher":
@@ -217,17 +217,17 @@ def deselect_by_keyword(items: "List[Item]", config: Config) -> None:
         items[:] = remaining
 
 
-@attr.s(slots=True)
+@attr.s(slots=True, auto_attribs=True)
 class MarkMatcher:
     """A matcher for markers which are present.
 
     Tries to match on any marker names, attached to the given colitem.
     """
 
-    own_mark_names = attr.ib()
+    own_mark_names: AbstractSet[str]
 
     @classmethod
-    def from_item(cls, item) -> "MarkMatcher":
+    def from_item(cls, item: "Item") -> "MarkMatcher":
         mark_names = {mark.name for mark in item.iter_markers()}
         return cls(mark_names)
 
diff --git a/src/_pytest/mark/expression.py b/src/_pytest/mark/expression.py
index 20b424e16..836e1ebd4 100644
--- a/src/_pytest/mark/expression.py
+++ b/src/_pytest/mark/expression.py
@@ -47,11 +47,11 @@ class TokenType(enum.Enum):
     EOF = "end of input"
 
 
-@attr.s(frozen=True, slots=True)
+@attr.s(frozen=True, slots=True, auto_attribs=True)
 class Token:
-    type = attr.ib(type=TokenType)
-    value = attr.ib(type=str)
-    pos = attr.ib(type=int)
+    type: TokenType
+    value: str
+    pos: int
 
 
 class ParseError(Exception):
diff --git a/src/_pytest/pytester.py b/src/_pytest/pytester.py
index c8258d4b6..d902226bf 100644
--- a/src/_pytest/pytester.py
+++ b/src/_pytest/pytester.py
@@ -33,7 +33,6 @@ from typing import TYPE_CHECKING
 from typing import Union
 from weakref import WeakKeyDictionary
 
-import attr
 from iniconfig import IniConfig
 from iniconfig import SectionWrapper
 
@@ -1518,7 +1517,6 @@ class LineComp:
 
 
 @final
-@attr.s(repr=False, str=False, init=False)
 class Testdir:
     """
     Similar to :class:`Pytester`, but this class works with legacy legacy_path objects instead.
diff --git a/src/_pytest/skipping.py b/src/_pytest/skipping.py
index f18716b14..ab585095b 100644
--- a/src/_pytest/skipping.py
+++ b/src/_pytest/skipping.py
@@ -157,11 +157,11 @@ def evaluate_condition(item: Item, mark: Mark, condition: object) -> Tuple[bool,
     return result, reason
 
 
-@attr.s(slots=True, frozen=True)
+@attr.s(slots=True, frozen=True, auto_attribs=True)
 class Skip:
     """The result of evaluate_skip_marks()."""
 
-    reason = attr.ib(type=str, default="unconditional skip")
+    reason: str = "unconditional skip"
 
 
 def evaluate_skip_marks(item: Item) -> Optional[Skip]:
@@ -192,14 +192,14 @@ def evaluate_skip_marks(item: Item) -> Optional[Skip]:
     return None
 
 
-@attr.s(slots=True, frozen=True)
+@attr.s(slots=True, frozen=True, auto_attribs=True)
 class Xfail:
     """The result of evaluate_xfail_marks()."""
 
-    reason = attr.ib(type=str)
-    run = attr.ib(type=bool)
-    strict = attr.ib(type=bool)
-    raises = attr.ib(type=Optional[Tuple[Type[BaseException], ...]])
+    reason: str
+    run: bool
+    strict: bool
+    raises: Optional[Tuple[Type[BaseException], ...]]
 
 
 def evaluate_xfail_marks(item: Item) -> Optional[Xfail]:
diff --git a/src/_pytest/terminal.py b/src/_pytest/terminal.py
index 0375c4d4e..b34e2e2a8 100644
--- a/src/_pytest/terminal.py
+++ b/src/_pytest/terminal.py
@@ -14,6 +14,7 @@ from pathlib import Path
 from typing import Any
 from typing import Callable
 from typing import cast
+from typing import ClassVar
 from typing import Dict
 from typing import Generator
 from typing import List
@@ -279,7 +280,7 @@ def pytest_report_teststatus(report: BaseReport) -> Tuple[str, str, str]:
     return outcome, letter, outcome.upper()
 
 
-@attr.s
+@attr.s(auto_attribs=True)
 class WarningReport:
     """Simple structure to hold warnings information captured by ``pytest_warning_recorded``.
 
@@ -291,10 +292,11 @@ class WarningReport:
         File system location of the source of the warning (see ``get_location``).
     """
 
-    message = attr.ib(type=str)
-    nodeid = attr.ib(type=Optional[str], default=None)
-    fslocation = attr.ib(type=Optional[Tuple[str, int]], default=None)
-    count_towards_summary = True
+    message: str
+    nodeid: Optional[str] = None
+    fslocation: Optional[Tuple[str, int]] = None
+
+    count_towards_summary: ClassVar = True
 
     def get_location(self, config: Config) -> Optional[str]:
         """Return the more user-friendly information about the location of a warning, or None."""
diff --git a/src/_pytest/tmpdir.py b/src/_pytest/tmpdir.py
index 8c513ca46..ce9fa59c9 100644
--- a/src/_pytest/tmpdir.py
+++ b/src/_pytest/tmpdir.py
@@ -158,12 +158,12 @@ class TempPathFactory:
 
 
 @final
-@attr.s(init=False)
+@attr.s(init=False, auto_attribs=True)
 class TempdirFactory:
     """Backward compatibility wrapper that implements :class:``_pytest.compat.LEGACY_PATH``
     for :class:``TempPathFactory``."""
 
-    _tmppath_factory = attr.ib(type=TempPathFactory)
+    _tmppath_factory: TempPathFactory
 
     def __init__(
         self, tmppath_factory: TempPathFactory, *, _ispytest: bool = False
diff --git a/src/_pytest/warning_types.py b/src/_pytest/warning_types.py
index 2eadd9fe4..4139225d7 100644
--- a/src/_pytest/warning_types.py
+++ b/src/_pytest/warning_types.py
@@ -116,7 +116,7 @@ _W = TypeVar("_W", bound=PytestWarning)
 
 
 @final
-@attr.s
+@attr.s(auto_attribs=True)
 class UnformattedWarning(Generic[_W]):
     """A warning meant to be formatted during runtime.
 
@@ -124,8 +124,8 @@ class UnformattedWarning(Generic[_W]):
     as opposed to a direct message.
     """
 
-    category = attr.ib(type=Type["_W"])
-    template = attr.ib(type=str)
+    category: Type["_W"]
+    template: str
 
     def format(self, **kwargs: Any) -> _W:
         """Return an instance of the warning category, formatted with given kwargs."""
diff --git a/testing/code/test_excinfo.py b/testing/code/test_excinfo.py
index 9cd862ae4..61aa4406a 100644
--- a/testing/code/test_excinfo.py
+++ b/testing/code/test_excinfo.py
@@ -455,7 +455,7 @@ class TestFormattedExcinfo:
                 pass
             """
         ).strip()
-        pr.flow_marker = "|"
+        pr.flow_marker = "|"  # type: ignore[misc]
         lines = pr.get_source(source, 0)
         assert len(lines) == 2
         assert lines[0] == "|   def f(x):"