diff --git a/pyproject.toml b/pyproject.toml
index 501096e4ac4..c3f01f1488a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = [ "setuptools>=62.0.0" ]
+requires = [ "setuptools>=77.0.0" ]
 build-backend = "setuptools.build_meta"
 
 [project]
@@ -14,7 +14,7 @@ maintainers = [
     { name="Guillaume VALADON" },
     { name="Nils WEISS" },
 ]
-license = { text="GPL-2.0-only" }
+license = "GPL-2.0-only"
 requires-python = ">=3.7, <4"
 description = "Scapy: interactive packet manipulation tool"
 keywords = [ "network" ]
@@ -26,7 +26,6 @@ classifiers = [
     "Intended Audience :: Science/Research",
     "Intended Audience :: System Administrators",
     "Intended Audience :: Telecommunications Industry",
-    "License :: OSI Approved :: GNU General Public License v2 (GPLv2)",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
     "Programming Language :: Python :: 3.7",
diff --git a/scapy/config.py b/scapy/config.py
index a6a406fa979..4fe4c6253b8 100755
--- a/scapy/config.py
+++ b/scapy/config.py
@@ -587,10 +587,10 @@ def __repr__(self):
 class ExtsManager(importlib.abc.MetaPathFinder):
     __slots__ = ["exts", "_loaded", "all_specs"]
 
-    SCAPY_PLUGIN_CLASSIFIER = 'Framework :: Scapy'
-    GPLV2_CLASSIFIERS = [
-        'License :: OSI Approved :: GNU General Public License v2 (GPLv2)',
-        'License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)',
+    SCAPY_PLUGIN_CLASSIFIER = "Framework :: Scapy Plugin"
+    ALLOWED_LICENCES = [
+        "GPL-2.0-only",
+        "GPL-2.0-or-later",
     ]
 
     def __init__(self):
@@ -639,8 +639,8 @@ def load(self):
                 if pkg in self._loaded:
                     continue
                 if not any(
-                    v in self.GPLV2_CLASSIFIERS
-                    for k, v in distr.metadata.items() if k == 'Classifier'
+                    v in self.ALLOWED_LICENCES
+                    for k, v in distr.metadata.items() if k == 'License-Expression'
                 ):
                     log_loading.warning(
                         "'%s' has no GPLv2 classifier therefore cannot be loaded." % pkg  # noqa: E501
diff --git a/scapy/layers/l2.py b/scapy/layers/l2.py
index 532cd9a5f21..a9d11d41b79 100644
--- a/scapy/layers/l2.py
+++ b/scapy/layers/l2.py
@@ -895,14 +895,14 @@ def arpcachepoison(
 
 @conf.commands.register
 def arp_mitm(
-    ip1,  # type: str
-    ip2,  # type: str
+    ip1: str,
+    ip2: str,
     mac1=None,  # type: Optional[Union[str, List[str]]]
     mac2=None,  # type: Optional[Union[str, List[str]]]
-    broadcast=False,  # type: bool
-    target_mac=None,  # type: Optional[str]
-    iface=None,  # type: Optional[_GlobInterfaceType]
-    inter=3,  # type: int
+    broadcast: bool = False,
+    target_mac: Optional[str] = None,
+    iface: Optional[_GlobInterfaceType] = None,
+    inter: int = 3,
 ):
     # type: (...) -> None
     r"""ARP MitM: poison 2 target's ARP cache
diff --git a/scapy/layers/smbclient.py b/scapy/layers/smbclient.py
index adf7b093fdb..fb5f059301d 100644
--- a/scapy/layers/smbclient.py
+++ b/scapy/layers/smbclient.py
@@ -1126,7 +1126,7 @@ def __init__(
         guest: bool = False,
         kerberos: bool = True,
         kerberos_required: bool = False,
-        HashNt: str = None,
+        HashNt: bytes = None,
         port: int = 445,
         timeout: int = 2,
         debug: int = 0,
diff --git a/scapy/utils.py b/scapy/utils.py
index c9d673c9244..d7251278116 100644
--- a/scapy/utils.py
+++ b/scapy/utils.py
@@ -3900,13 +3900,26 @@ def AutoArgparse(func: DecoratorCallable) -> None:
             continue
         parname = param.name
         paramkwargs = {}
-        if param.annotation is bool:
+        paramtype = param.annotation
+        # Process types we don't know
+        if paramtype not in [bool, str, int, float]:
+            try:
+                if paramtype.__origin__ is Union:
+                    # Handles Optional[] and Union[]
+                    paramtype = next(
+                        x for x in paramtype.__args__
+                        if x in [bool, str, int, float]
+                    )
+            except Exception:
+                pass
+        # Process the types we know
+        if paramtype is bool:
             if param.default is True:
                 parname = "no-" + parname
                 paramkwargs["action"] = "store_false"
             else:
                 paramkwargs["action"] = "store_true"
-        elif param.annotation in [str, int, float]:
+        elif paramtype in [str, int, float]:
             paramkwargs["type"] = param.annotation
         else:
             continue