diff -rupN a/pymaging/formats.py b/pymaging/formats.py
--- a/pymaging/formats.py	2013-09-08 13:12:02.000000000 +0000
+++ b/pymaging/formats.py	2026-03-31 21:03:10.910000000 +0000
@@ -49,8 +49,8 @@ class FormatRegistry(object):
         if self.loaded:
             return
         with self.write_lock:
-            import pkg_resources
-            for entry_point in pkg_resources.iter_entry_points('pymaging.formats'):
+            from importlib.metadata import entry_points
+            for entry_point in entry_points(name='pymaging.formats'):
                 format = entry_point.load()
                 self.register(format)
             self.loaded = True