diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 7c55224..74fedc5 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -9,7 +9,7 @@ ci:
 
 repos:
     - repo: https://github.com/astral-sh/ruff-pre-commit
-      rev: v0.11.4
+      rev: v0.11.5
       hooks:
           - id: ruff
             args: [--fix]
@@ -45,7 +45,7 @@ repos:
             exclude: tests/(eval|autofix)_files/.*_py(310|311).py
 
     - repo: https://github.com/RobertCraigie/pyright-python
-      rev: v1.1.398
+      rev: v1.1.399
       hooks:
           - id: pyright
             # ignore warnings about new version being available, no other warnings
diff --git a/flake8_async/runner.py b/flake8_async/runner.py
index 3d9a136..4562892 100644
--- a/flake8_async/runner.py
+++ b/flake8_async/runner.py
@@ -12,6 +12,7 @@
 
 import libcst as cst
 
+from .base import Error, Options
 from .visitors import (
     ERROR_CLASSES,
     ERROR_CLASSES_CST,
@@ -25,18 +26,17 @@
 
     from libcst import Module
 
-    from .base import Error, Options
     from .visitors.flake8asyncvisitor import Flake8AsyncVisitor, Flake8AsyncVisitor_cst
 
 
 @dataclass
 class SharedState:
     options: Options
-    problems: list[Error] = field(default_factory=list)
-    noqas: dict[int, set[str]] = field(default_factory=dict)
+    problems: list[Error] = field(default_factory=list[Error])
+    noqas: dict[int, set[str]] = field(default_factory=dict[int, set[str]])
     library: tuple[str, ...] = ()
-    typed_calls: dict[str, str] = field(default_factory=dict)
-    variables: dict[str, str] = field(default_factory=dict)
+    typed_calls: dict[str, str] = field(default_factory=dict[str, str])
+    variables: dict[str, str] = field(default_factory=dict[str, str])
 
 
 class __CommonRunner:
diff --git a/flake8_async/visitors/visitor91x.py b/flake8_async/visitors/visitor91x.py
index 853e644..43cba5b 100644
--- a/flake8_async/visitors/visitor91x.py
+++ b/flake8_async/visitors/visitor91x.py
@@ -162,13 +162,21 @@ class LoopState:
     body_guaranteed_once: bool = False
     has_break: bool = False
 
-    uncheckpointed_before_continue: set[Statement] = field(default_factory=set)
-    uncheckpointed_before_break: set[Statement] = field(default_factory=set)
-
-    artificial_errors: set[cst.Return | cst.Yield] = field(default_factory=set)
-    nodes_needing_checkpoints: list[cst.Return | cst.Yield | ArtificialStatement] = (
-        field(default_factory=list)
+    uncheckpointed_before_continue: set[Statement] = field(
+        default_factory=set[Statement]
     )
+    uncheckpointed_before_break: set[Statement] = field(default_factory=set[Statement])
+    # pyright emits reportUnknownVariableType, requiring the generic to default_factory
+    # to be specified.
+    # But for these we require a union, and `|` doesn't work on py39, and uses of
+    # `Union` gets autofixed by ruff.
+    # So.... let's just ignore the error for now
+    artificial_errors: set[  # pyright: ignore[reportUnknownVariableType]
+        cst.Return | cst.Yield
+    ] = field(default_factory=set)
+    nodes_needing_checkpoints: list[  # pyright: ignore[reportUnknownVariableType]
+        cst.Return | cst.Yield | ArtificialStatement
+    ] = field(default_factory=list)
 
     def copy(self):
         return LoopState(
@@ -184,10 +192,14 @@ def copy(self):
 
 @dataclass
 class TryState:
-    body_uncheckpointed_statements: set[Statement] = field(default_factory=set)
-    try_checkpoint: set[Statement] = field(default_factory=set)
-    except_uncheckpointed_statements: set[Statement] = field(default_factory=set)
-    added: set[Statement] = field(default_factory=set)
+    body_uncheckpointed_statements: set[Statement] = field(
+        default_factory=set[Statement]
+    )
+    try_checkpoint: set[Statement] = field(default_factory=set[Statement])
+    except_uncheckpointed_statements: set[Statement] = field(
+        default_factory=set[Statement]
+    )
+    added: set[Statement] = field(default_factory=set[Statement])
 
     def copy(self):
         return TryState(
@@ -202,8 +214,12 @@ def copy(self):
 class MatchState:
     # TryState, LoopState, and MatchState all do fairly similar things. It would be nice
     # to harmonize them and share logic.
-    base_uncheckpointed_statements: set[Statement] = field(default_factory=set)
-    case_uncheckpointed_statements: set[Statement] = field(default_factory=set)
+    base_uncheckpointed_statements: set[Statement] = field(
+        default_factory=set[Statement]
+    )
+    case_uncheckpointed_statements: set[Statement] = field(
+        default_factory=set[Statement]
+    )
     has_fallback: bool = False
 
     def copy(self):