@@ -15,14 +15,14 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         fetch-depth: 1000
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
 
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 #
 # GitDB documentation build configuration file, created by
 # sphinx-quickstart on Wed Jun 30 00:01:32 2010.
@@ -38,8 +37,8 @@
 master_doc = 'index'
 
 # General information about the project.
-project = u'GitDB'
-copyright = u'2011, Sebastian Thiel'
+project = 'GitDB'
+copyright = '2011, Sebastian Thiel'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -172,8 +171,8 @@
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title, author, documentclass [howto/manual]).
 latex_documents = [
-    ('index', 'GitDB.tex', u'GitDB Documentation',
-     u'Sebastian Thiel', 'manual'),
+    ('index', 'GitDB.tex', 'GitDB Documentation',
+     'Sebastian Thiel', 'manual'),
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
 
@@ -22,7 +22,7 @@
 __all__ = ('ObjectDBR', 'ObjectDBW', 'FileDBBase', 'CompoundDB', 'CachingDB')
 
 
-class ObjectDBR(object):
+class ObjectDBR:
 
     """Defines an interface for object database lookup.
     Objects are identified either by their 20 byte bin sha"""
@@ -63,7 +63,7 @@ def sha_iter(self):
     #} END query interface
 
 
-class ObjectDBW(object):
+class ObjectDBW:
 
     """Defines an interface to create objects in the database"""
 
@@ -105,7 +105,7 @@ def store(self, istream):
     #} END edit interface
 
 
-class FileDBBase(object):
+class FileDBBase:
 
     """Provides basic facilities to retrieve files of interest, including
     caching facilities to help mapping hexsha's to objects"""
@@ -117,7 +117,7 @@ def __init__(self, root_path):
         **Note:** The base will not perform any accessablity checking as the base
             might not yet be accessible, but become accessible before the first
             access."""
-        super(FileDBBase, self).__init__()
+        super().__init__()
         self._root_path = root_path
 
     #{ Interface
@@ -133,7 +133,7 @@ def db_path(self, rela_path):
     #} END interface
 
 
-class CachingDB(object):
+class CachingDB:
 
     """A database which uses caches to speed-up access"""
 
@@ -176,7 +176,7 @@ def _set_cache_(self, attr):
         elif attr == '_db_cache':
             self._db_cache = dict()
         else:
-            super(CompoundDB, self)._set_cache_(attr)
+            super()._set_cache_(attr)
 
     def _db_query(self, sha):
         """:return: database containing the given 20 byte sha
 
@@ -39,7 +39,7 @@ class GitDB(FileDBBase, ObjectDBW, CompoundDB):
 
     def __init__(self, root_path):
         """Initialize ourselves on a git objects directory"""
-        super(GitDB, self).__init__(root_path)
+        super().__init__(root_path)
 
     def _set_cache_(self, attr):
         if attr == '_dbs' or attr == '_loose_db':
@@ -68,7 +68,7 @@ def _set_cache_(self, attr):
             # finally set the value
             self._loose_db = loose_db
         else:
-            super(GitDB, self)._set_cache_(attr)
+            super()._set_cache_(attr)
         # END handle attrs
 
     #{ ObjectDBW interface
 
@@ -75,7 +75,7 @@ class LooseObjectDB(FileDBBase, ObjectDBR, ObjectDBW):
         new_objects_mode = int("644", 8)
 
     def __init__(self, root_path):
-        super(LooseObjectDB, self).__init__(root_path)
+        super().__init__(root_path)
         self._hexsha_to_file = dict()
         # Additional Flags - might be set to 0 after the first failure
         # Depending on the root, this might work for some mounts, for others not, which
@@ -151,7 +151,7 @@ def set_ostream(self, stream):
         """:raise TypeError: if the stream does not support the Sha1Writer interface"""
         if stream is not None and not isinstance(stream, Sha1Writer):
             raise TypeError("Output stream musst support the %s interface" % Sha1Writer.__name__)
-        return super(LooseObjectDB, self).set_ostream(stream)
+        return super().set_ostream(stream)
 
     def info(self, sha):
         m = self._map_loose_object(sha)
 
@@ -37,7 +37,7 @@ class MemoryDB(ObjectDBR, ObjectDBW):
     exists in the target storage before introducing actual IO"""
 
     def __init__(self):
-        super(MemoryDB, self).__init__()
+        super().__init__()
         self._db = LooseObjectDB("path/doesnt/matter")
 
         # maps 20 byte shas to their OStream objects
 
@@ -39,7 +39,7 @@ class PackedDB(FileDBBase, ObjectDBR, CachingDB, LazyMixin):
     _sort_interval = 500
 
     def __init__(self, root_path):
-        super(PackedDB, self).__init__(root_path)
+        super().__init__(root_path)
         # list of lists with three items:
         # * hits - number of times the pack was hit with a request
         # * entity - Pack entity instance
 
@@ -20,15 +20,15 @@ class ReferenceDB(CompoundDB):
     ObjectDBCls = None
 
     def __init__(self, ref_file):
-        super(ReferenceDB, self).__init__()
+        super().__init__()
         self._ref_file = ref_file
 
     def _set_cache_(self, attr):
         if attr == '_dbs':
             self._dbs = list()
             self._update_dbs_from_ref_file()
         else:
-            super(ReferenceDB, self)._set_cache_(attr)
+            super()._set_cache_(attr)
         # END handle attrs
 
     def _update_dbs_from_ref_file(self):
@@ -44,7 +44,7 @@ def _update_dbs_from_ref_file(self):
         try:
             with codecs.open(self._ref_file, 'r', encoding="utf-8") as f:
                 ref_paths = [l.strip() for l in f]
-        except (OSError, IOError):
+        except OSError:
             pass
         # END handle alternates
 
@@ -79,4 +79,4 @@ def _update_dbs_from_ref_file(self):
     def update_cache(self, force=False):
         # re-read alternates and update databases
         self._update_dbs_from_ref_file()
-        return super(ReferenceDB, self).update_cache(force)
+        return super().update_cache(force)
@@ -113,7 +113,7 @@ def delta_chunk_apply(dc, bbuf, write):
     # END handle chunk mode
 
 
-class DeltaChunk(object):
+class DeltaChunk:
 
     """Represents a piece of a delta, it can either add new data, or copy existing
     one from a source buffer"""