diff --git a/glad/plugin.py b/glad/plugin.py
index b7d233ce..a8f4cc1e 100644
--- a/glad/plugin.py
+++ b/glad/plugin.py
@@ -1,11 +1,22 @@
 import logging
-import pkg_resources
+import inspect
+try:
+    from importlib.metadata import entry_points
+except ImportError:
+    try:
+        from importlib_metadata import entry_points
+    except ImportError:
+        import pkg_resources
+
+        def entry_points(group=None):
+            return pkg_resources.iter_entry_points(group=group, name=None)
 
 import glad.specification
 from glad.generator.c import CGenerator
 from glad.generator.rust import RustGenerator
 from glad.parse import Specification
 
+
 logger = logging.getLogger(__name__)
 
 
@@ -16,33 +27,28 @@
 DEFAULT_GENERATORS = dict(
     c=CGenerator,
     rust=RustGenerator
-    # TODO fix those
-    # d=DGenerator,
-    # volt=VoltGenerator
 )
-
 DEFAULT_SPECIFICATIONS = dict()
 
-import inspect
 for name, cls in inspect.getmembers(glad.specification, inspect.isclass):
     if issubclass(cls, Specification) and cls is not Specification:
         DEFAULT_SPECIFICATIONS[cls.NAME] = cls
 
 
-def find_generators(default=DEFAULT_GENERATORS, entry_point=GENERATOR_ENTRY_POINT):
-    generators = dict(default)
+def find_generators(default=None, entry_point=GENERATOR_ENTRY_POINT):
+    generators = dict(DEFAULT_GENERATORS if default is None else default)
 
-    for entry_point in pkg_resources.iter_entry_points(group=entry_point, name=None):
+    for entry_point in entry_points(group=entry_point):
         generators[entry_point.name] = entry_point.load()
         logger.debug('loaded language %s: %s', entry_point.name, generators[entry_point.name])
 
     return generators
 
 
-def find_specifications(default=DEFAULT_SPECIFICATIONS, entry_point=SPECIFICATION_ENTRY_POINT):
-    specifications = dict(default)
+def find_specifications(default=None, entry_point=SPECIFICATION_ENTRY_POINT):
+    specifications = dict(DEFAULT_SPECIFICATIONS if default is None else default)
 
-    for entry_point in pkg_resources.iter_entry_points(group=entry_point, name=None):
+    for entry_point in entry_points(group=entry_point):
         specifications[entry_point.name] = entry_point.load()
         logger.debug('loaded specification %s: %s', entry_point.name, specifications[entry_point.name])
 
diff --git a/setup.py b/setup.py
index a4405b67..c687805f 100644
--- a/setup.py
+++ b/setup.py
@@ -57,13 +57,11 @@
             'License :: OSI Approved :: MIT License',
             'Natural Language :: English',
             'Operating System :: OS Independent',
-            'Programming Language :: Python :: 2',
-            'Programming Language :: Python :: 2.7',
             'Programming Language :: Python :: 3',
-            'Programming Language :: Python :: 3.7',
             'Programming Language :: Python :: 3.8',
             'Programming Language :: Python :: 3.9',
             'Programming Language :: Python :: 3.10',
+            'Programming Language :: Python :: 3.11',
             'Topic :: Games/Entertainment',
             'Topic :: Multimedia :: Graphics',
             'Topic :: Multimedia :: Graphics :: 3D Rendering',