diff --git a/test-requirements.txt b/test-requirements.txt
index 2ea1640ff0..adab2e00bb 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -6,7 +6,7 @@
 #
 astor==0.8.1
     # via -r test-requirements.in
-astroid==2.14.1
+astroid==2.14.2
     # via pylint
 async-generator==1.10
     # via -r test-requirements.in
@@ -39,6 +39,10 @@ decorator==5.1.1
     # via ipython
 dill==0.3.6
     # via pylint
+exceptiongroup==1.1.0 ; python_version < "3.11"
+    # via
+    #   -r test-requirements.in
+    #   pytest
 flake8==4.0.1
     # via -r test-requirements.in
 idna==3.4
@@ -121,6 +125,14 @@ sniffio==1.3.0
     # via -r test-requirements.in
 sortedcontainers==2.4.0
     # via -r test-requirements.in
+tomli==2.0.1
+    # via
+    #   black
+    #   build
+    #   coverage
+    #   mypy
+    #   pylint
+    #   pytest
 tomlkit==0.11.6
     # via pylint
 traitlets==5.9.0
@@ -134,7 +146,10 @@ types-pyopenssl==23.0.0.2 ; implementation_name == "cpython"
 typing-extensions==4.4.0 ; implementation_name == "cpython"
     # via
     #   -r test-requirements.in
+    #   astroid
+    #   black
     #   mypy
+    #   pylint
 wcwidth==0.2.6
     # via prompt-toolkit
 wheel==0.38.4
diff --git a/trio/_core/_instrumentation.py b/trio/_core/_instrumentation.py
index e14c1ef1e0..b133d47406 100644
--- a/trio/_core/_instrumentation.py
+++ b/trio/_core/_instrumentation.py
@@ -11,6 +11,7 @@
 
 F = TypeVar("F", bound=Callable[..., Any])
 
+
 # Decorator to mark methods public. This does nothing by itself, but
 # trio/_tools/gen_exports.py looks for it.
 def _public(fn: F) -> F:
diff --git a/trio/_core/_run.py b/trio/_core/_run.py
index dc6ff21802..7811af172c 100644
--- a/trio/_core/_run.py
+++ b/trio/_core/_run.py
@@ -54,6 +54,7 @@
 
 FnT = TypeVar("FnT", bound="Callable[..., Any]")
 
+
 # Decorator to mark methods public. This does nothing by itself, but
 # trio/_tools/gen_exports.py looks for it.
 def _public(fn: FnT) -> FnT:
diff --git a/trio/_core/_traps.py b/trio/_core/_traps.py
index 39481c5903..aedf839a8d 100644
--- a/trio/_core/_traps.py
+++ b/trio/_core/_traps.py
@@ -10,6 +10,7 @@
 
 from typing import Callable, NoReturn, Any
 
+
 # Helper for the bottommost 'yield'. You can't use 'yield' inside an async
 # function, but you can inside a generator, and if you decorate your generator
 # with @types.coroutine, then it's even awaitable. However, it's still not a
@@ -67,6 +68,7 @@ class WaitTaskRescheduled:
 
 RaiseCancelT = Callable[[], NoReturn]  # TypeAlias
 
+
 # Should always return the type a Task "expects", unless you willfully reschedule it
 # with a bad value.
 async def wait_task_rescheduled(abort_func: Callable[[RaiseCancelT], Abort]) -> Any:
diff --git a/trio/_core/tests/test_guest_mode.py b/trio/_core/tests/test_guest_mode.py
index a5d6d78e18..9fed232214 100644
--- a/trio/_core/tests/test_guest_mode.py
+++ b/trio/_core/tests/test_guest_mode.py
@@ -17,6 +17,7 @@
 from .tutil import gc_collect_harder, buggy_pypy_asyncgens, restore_unraisablehook
 from ..._util import signal_raise
 
+
 # The simplest possible "host" loop.
 # Nice features:
 # - we can run code "outside" of trio using the schedule function passed to
@@ -227,6 +228,7 @@ async def sit_in_wait_all_tasks_blocked(watb_cscope):
         async def get_woken_by_host_deadline(watb_cscope):
             with trio.CancelScope() as cscope:
                 print("scheduling stuff to happen")
+
                 # Altering the deadline from the host, to something in the
                 # future, will cause the run loop to wake up, but then
                 # discover that there is nothing to do and go back to sleep.
diff --git a/trio/_socket.py b/trio/_socket.py
index 8bfa6d265a..b12126f7e1 100644
--- a/trio/_socket.py
+++ b/trio/_socket.py
@@ -353,6 +353,7 @@ async def wrapper(self, *args, **kwargs):
 # addresses everywhere. Split out into a standalone function so it can be reused by
 # FakeNet.
 
+
 # Take an address in Python's representation, and returns a new address in
 # the same representation, but with names resolved to numbers,
 # etc.