diff --git a/pyproject.toml b/pyproject.toml
index bae68252e4..38eeacaf42 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,7 @@ test = [
 
 	# local
 	"virtualenv>=13.0.0",
-	"wheel>=0.44.0",  # Consistent requirement normalisation in METADATA (see #4547)
+	"wheel>=0.44.0", # Consistent requirement normalisation in METADATA (see #4547)
 	"pip>=19.1", # For proper file:// URLs support.
 	"packaging>=23.2",
 	"jaraco.envs>=2.2",
@@ -54,27 +54,12 @@ test = [
 	# for tools/finalize.py
 	'jaraco.develop >= 7.21; python_version >= "3.9" and sys_platform != "cygwin"',
 	"pytest-home >= 0.5",
-	# pin mypy version so a new version doesn't suddenly cause the CI to fail,
-	# until types-setuptools is removed from typeshed.
-	# For help with static-typing issues, or mypy update, ping @Avasam 
-	"mypy==1.11.*",
-	# No Python 3.11 dependencies require tomli, but needed for type-checking since we import it directly
-	"tomli",
-	# No Python 3.12 dependencies require importlib_metadata, but needed for type-checking since we import it directly
-	"importlib_metadata",
 	"pytest-subprocess",
 
-	# require newer pytest-ruff than upstream for pypa/setuptools#4368
-	# also exclude cygwin for pypa/setuptools#3921
-	'pytest-ruff >= 0.3.2; sys_platform != "cygwin"',
-
 	# workaround for pypa/setuptools#4333
 	"pyproject-hooks!=1.1",
 
 	"jaraco.test",
-
-	# workaround for businho/pytest-ruff#28
-	'pytest-ruff < 0.4; platform_system == "Windows"',
 ]
 
 doc = [
@@ -118,8 +103,17 @@ core = [
 ]
 
 check = [
+	# upstream
 	"pytest-checkdocs >= 2.4",
 	"pytest-ruff >= 0.2.1; sys_platform != 'cygwin'",
+
+	# local
+
+	# require newer pytest-ruff than upstream for pypa/setuptools#4368
+	# also exclude cygwin for pypa/setuptools#3921
+	'pytest-ruff >= 0.3.2; sys_platform != "cygwin"',
+	# workaround for businho/pytest-ruff#28
+	'pytest-ruff < 0.4; platform_system == "Windows"',
 ]
 
 cover = [
@@ -135,6 +129,17 @@ type = [
 	"pytest-mypy",
 
 	# local
+
+	# pin mypy version so a new version doesn't suddenly cause the CI to fail,
+	# until types-setuptools is removed from typeshed.
+	# For help with static-typing issues, or mypy update, ping @Avasam 
+	"mypy==1.11.*",
+	# Conditionally imported vendored dependencies.
+	# They're not needed at runtime for Python version outside the [core] extra,
+	# but they're still needed for type-checking since we import them directly
+	"tomli",
+	"importlib_resources",
+	"importlib_metadata",
 ]