diff --git a/pyproject.toml b/pyproject.toml
index 7c517943a41..e99df9d113b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,17 +25,6 @@ classifiers = [
 keywords = ["CPAN PyPI distutils eggs package management"]
 requires-python = ">=3.8"
 dependencies = [
-	"packaging>=24",
-	"ordered-set>=3.1.1",
-	"more_itertools>=8.8",
-	"jaraco.text>=3.7",
-	"importlib_resources>=5.10.2",
-	"importlib_metadata>=6",
-	"tomli>=2.0.1",
-	"wheel>=0.43.0",
-
-	# pkg_resources
-	"platformdirs >= 2.6.2",
 ]
 
 [project.urls]
@@ -107,6 +96,19 @@ doc = [
 ]
 ssl = []
 certs = []
+full = [
+	"packaging>=24",
+	"ordered-set>=3.1.1",
+	"more_itertools>=8.8",
+	"jaraco.text>=3.7",
+	"importlib_resources>=5.10.2",
+	"importlib_metadata>=6",
+	"tomli>=2.0.1",
+	"wheel>=0.43.0",
+
+	# pkg_resources
+	"platformdirs >= 2.6.2",
+]
 
 [project.entry-points."distutils.commands"]
 alias = "setuptools.command.alias:alias"
diff --git a/tools/vendored.py b/tools/vendored.py
index 5f8a6c09067..84cf5a8f183 100644
--- a/tools/vendored.py
+++ b/tools/vendored.py
@@ -1,4 +1,5 @@
 import functools
+import re
 import sys
 import subprocess
 
@@ -29,11 +30,18 @@ def metadata():
     return jaraco.packaging.metadata.load('.')
 
 
+def upgrade_full(dep):
+    """
+    Remove 'extra == "full"' from any dependency.
+    """
+    return re.sub('''(;| and) extra == ['"]full['"]''', '', dep)
+
+
 def load_deps():
     """
-    Read the dependencies from `.`.
+    Read the dependencies from `.[full]`.
     """
-    return metadata().get_all('Requires-Dist')
+    return list(map(upgrade_full, metadata().get_all('Requires-Dist')))
 
 
 def min_python():