diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index e623da2..6ff1e62 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -36,6 +36,6 @@ repos:
     hooks:
     -   id: flake8
 -   repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.10.1
+    rev: v1.11.0
     hooks:
     -   id: mypy
diff --git a/add_trailing_comma/_ast_helpers.py b/add_trailing_comma/_ast_helpers.py
index 09759ee..942803e 100644
--- a/add_trailing_comma/_ast_helpers.py
+++ b/add_trailing_comma/_ast_helpers.py
@@ -2,6 +2,7 @@
 
 import ast
 import warnings
+from typing import Protocol
 
 from tokenize_rt import Offset
 
@@ -12,5 +13,12 @@ def ast_parse(contents_text: str) -> ast.Module:
         return ast.parse(contents_text.encode())
 
 
-def ast_to_offset(node: ast.AST) -> Offset:
+class _HasOffsetInfo(Protocol):
+    @property
+    def lineno(self) -> int: ...
+    @property
+    def col_offset(self) -> int: ...
+
+
+def ast_to_offset(node: _HasOffsetInfo) -> Offset:
     return Offset(node.lineno, node.col_offset)
diff --git a/add_trailing_comma/_data.py b/add_trailing_comma/_data.py
index 85cb82b..740fbd3 100644
--- a/add_trailing_comma/_data.py
+++ b/add_trailing_comma/_data.py
@@ -23,7 +23,8 @@ class State(NamedTuple):
 TokenFunc = Callable[[int, list[Token]], None]
 ASTFunc = Callable[[State, AST_T], Iterable[tuple[Offset, TokenFunc]]]
 
-FUNCS = collections.defaultdict(list)
+FUNCS: ASTCallbackMapping  # python/mypy#17566
+FUNCS = collections.defaultdict(list)  # type: ignore[assignment]
 
 
 def register(tp: type[AST_T]) -> Callable[[ASTFunc[AST_T]], ASTFunc[AST_T]]:
diff --git a/add_trailing_comma/_plugins/calls.py b/add_trailing_comma/_plugins/calls.py
index bd707dd..db6380c 100644
--- a/add_trailing_comma/_plugins/calls.py
+++ b/add_trailing_comma/_plugins/calls.py
@@ -34,7 +34,7 @@ def visit_Call(
         state: State,
         node: ast.Call,
 ) -> Iterable[tuple[Offset, TokenFunc]]:
-    argnodes = [*node.args, *node.keywords]
+    argnodes: list[ast.expr | ast.keyword] = [*node.args, *node.keywords]
     arg_offsets = set()
     for argnode in argnodes:
         offset = ast_to_offset(argnode)
diff --git a/add_trailing_comma/_plugins/classes.py b/add_trailing_comma/_plugins/classes.py
index 0d423e9..2e4af74 100644
--- a/add_trailing_comma/_plugins/classes.py
+++ b/add_trailing_comma/_plugins/classes.py
@@ -37,7 +37,7 @@ def visit_ClassDef(
     # starargs are allowed in py3 class definitions, py35+ allows trailing
     # commas.  py34 does not, but adding an option for this very obscure
     # case seems not worth it.
-    args = [*node.bases, *node.keywords]
+    args: list[ast.expr | ast.keyword] = [*node.bases, *node.keywords]
     arg_offsets = {ast_to_offset(arg) for arg in args}
 
     if arg_offsets: