--- fickling/fickle.py.orig	2020-02-01 19:00:00
+++ fickling/fickle.py	2026-01-18 21:23:12
@@ -19,8 +19,6 @@
     overload,
 )
 
-from stdlib_list import in_stdlib
-
 from fickling.exception import WrongMethodError
 
 T = TypeVar("T")
@@ -35,7 +33,7 @@
 GenericSequence = Sequence[T]
 make_constant = ast.Constant
 
-BUILTIN_MODULE_NAMES: frozenset[str] = frozenset(sys.builtin_module_names)
+BUILTIN_STDLIB_MODULE_NAMES: frozenset[str] = sys.stdlib_module_names
 
 OPCODES_BY_NAME: dict[str, type[Opcode]] = {}
 OPCODE_INFO_BY_NAME: dict[str, OpcodeInfo] = {opcode.name: opcode for opcode in opcodes}
@@ -66,7 +64,7 @@
 
 
 def is_std_module(module_name: str) -> bool:
-    return in_stdlib(module_name) or module_name in BUILTIN_MODULE_NAMES
+    return module_name in BUILTIN_STDLIB_MODULE_NAMES
 
 
 def extract_identifier_from_ast_node(
--- pyproject.toml.orig	2026-01-18 21:25:08
+++ pyproject.toml	2026-01-18 21:25:21
@@ -25,7 +25,6 @@
   "Topic :: Software Development :: Testing",
   "Topic :: Utilities",
 ]
-dependencies = ["stdlib_list ~= 0.11.1"]
 requires-python = ">=3.9"
 
 [project.optional-dependencies]