diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index d87b07b0..73a619f0 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -17,7 +17,7 @@ jobs:
     name: Benchmark
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: actions/setup-python@v6
@@ -40,7 +40,7 @@ jobs:
 
       - name: Restore previous results
         if: github.event_name != 'pull_request'
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: .asv
           key: asv-${{ runner.os }}
diff --git a/.github/workflows/pypi.yml b/.github/workflows/pypi.yml
index 3e41d8e5..c4ebcc3c 100644
--- a/.github/workflows/pypi.yml
+++ b/.github/workflows/pypi.yml
@@ -11,7 +11,7 @@ jobs:
     name: 🐍 sdist and universal wheel
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: hynek/build-and-inspect-python-package@v2
@@ -24,14 +24,14 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-13, macos-latest]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: astral-sh/setup-uv@v7
       - name: Build wheels via cibuildwheel
-        uses: pypa/cibuildwheel@v3.2
+        uses: pypa/cibuildwheel@v3.3
       - name: Upload wheels artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: cibw-wheels-${{ runner.os }}-${{ runner.arch }}
           path: ./wheelhouse/*.whl
@@ -47,12 +47,12 @@ jobs:
     steps:
 
       - name: Get sdist
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v7
         with:
           name: Packages
           path: dist
       - name: Get wheels
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v7
         with:
           pattern: cibw-wheels-*
           path: dist
@@ -61,7 +61,7 @@ jobs:
       - name: 🚢 Publish to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8c31b3ed..fcb194cb 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,7 +16,7 @@ jobs:
   check-manifest:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: pipx run check-manifest
 
   test:
@@ -55,7 +55,7 @@ jobs:
             compile: "1"
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: astral-sh/setup-uv@v7
         with:
           enable-cache: true
@@ -82,7 +82,7 @@ jobs:
         run: uv run coverage run -p -m pytest -v
 
       - name: Upload coverage
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: covreport-${{ matrix.os }}-py${{ matrix.python-version }}-mypyc${{ matrix.compile }}-${{ matrix.qt }}
           path: ./.coverage*
@@ -105,7 +105,7 @@ jobs:
   typing:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: astral-sh/setup-uv@v7
         with:
           enable-cache: true
@@ -116,7 +116,7 @@ jobs:
   benchmarks:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
         with:
           python-version: "3.13"
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 53792103..8acbced1 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -12,29 +12,29 @@ repos:
       - id: validate-pyproject
 
   - repo: https://github.com/rhysd/actionlint
-    rev: v1.7.8
+    rev: v1.7.9
     hooks:
       - id: actionlint
         files: "^\\.github/workflows/.*\\.ya?ml$"
 
   - repo: https://github.com/adhtruong/mirrors-typos
-    rev: v1.38.1
+    rev: v1.40.0
     hooks:
       - id: typos
         args: [--force-exclude] # omitting --write-changes
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.14.0
+    rev: v0.14.7
     hooks:
       - id: ruff-check
         args: [--fix, --unsafe-fixes]
       - id: ruff-format
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.18.2
+    rev: v1.19.0
     hooks:
       - id: mypy
-        exclude: tests|_throttler.pyi
+        exclude: tests|_throttler.pyi|_group.pyi
         additional_dependencies:
           - types-attrs
           - pydantic
diff --git a/src/psygnal/_group.py b/src/psygnal/_group.py
index 54da3cf1..f8fa7932 100644
--- a/src/psygnal/_group.py
+++ b/src/psygnal/_group.py
@@ -539,16 +539,6 @@ def __getitem__(self, item: str) -> SignalInstance:
         """Get a signal instance by name."""
         return self._psygnal_instances[item]
 
-    # this is just here for type checking, particularly on cases
-    # where the SignalGroup comes from the SignalGroupDescriptor
-    # (such as in evented dataclasses).  In those cases, it's hard to indicate
-    # to mypy that all remaining attributes are SignalInstances.
-    def __getattr__(self, __name: str) -> SignalInstance:
-        """Get a signal instance by name."""
-        raise AttributeError(  # pragma: no cover
-            f"{type(self).__name__!r} object has no attribute {__name!r}"
-        )
-
     def __iter__(self) -> Iterator[str]:
         """Yield the names of all signals in the group."""
         return iter(self._psygnal_instances)
diff --git a/src/psygnal/_group.pyi b/src/psygnal/_group.pyi
new file mode 100644
index 00000000..cefe578a
--- /dev/null
+++ b/src/psygnal/_group.pyi
@@ -0,0 +1,39 @@
+# This stub provides __getattr__ for type checking, which cannot be in the
+# main file because mypyc doesn't support __getattr__ in classes with
+# allow_interpreted_subclasses=True.
+from collections.abc import Iterator, Mapping
+from typing import Any, ClassVar
+
+from psygnal._signal import Signal, SignalInstance
+
+class SignalRelay(SignalInstance):
+    instance: Any
+    def __init__(
+        self, signals: Mapping[str, SignalInstance], instance: Any = None
+    ) -> None: ...
+
+class SignalGroup:
+    _psygnal_signals: ClassVar[Mapping[str, Signal]]
+    _psygnal_uniform: ClassVar[bool]
+    _psygnal_name_conflicts: ClassVar[set[str]]
+    _psygnal_aliases: ClassVar[dict[str, str | None]]
+    _psygnal_instances: dict[str, SignalInstance]
+
+    def __init__(self, instance: Any = None) -> None: ...
+    def __init_subclass__(
+        cls,
+        strict: bool = False,
+        signal_aliases: Mapping[str, str | None] = ...,
+    ) -> None: ...
+    @property
+    def instance(self) -> Any: ...
+    @property
+    def all(self) -> SignalRelay: ...
+    @property
+    def signals(self) -> Mapping[str, SignalInstance]: ...
+    def __len__(self) -> int: ...
+    def __getitem__(self, item: str) -> SignalInstance: ...
+    def __getattr__(self, name: str) -> SignalInstance: ...
+    def __iter__(self) -> Iterator[str]: ...
+    def __contains__(self, item: str) -> bool: ...
+    def __repr__(self) -> str: ...