diff --git a/src/pygitversionhelper/gitversionhelper.py b/src/pygitversionhelper/gitversionhelper.py
index e8735ca..75ced2d 100644
--- a/src/pygitversionhelper/gitversionhelper.py
+++ b/src/pygitversionhelper/gitversionhelper.py
@@ -283,7 +283,7 @@ class gitversionhelper: # pylint: disable=too-few-public-methods
                         raise gitversionhelper.wrongArguments(f"invalid {cls.__OptDict['bump_type']} requested")
                 return BumpType
 
-            def bump(self,amount:int=1,**kwargs) -> cls | str : # pylint: disable=R0912
+            def bump(self,amount:int=1,**kwargs) -> gitversionhelper.version.MetaVersion | str : # pylint: disable=R0912
                 """
                 bump the version to the next one
                 Keyword Arguments:
@@ -451,7 +451,7 @@ class gitversionhelper: # pylint: disable=too-few-public-methods
 
             if not bFound :
                 raise gitversionhelper.version.noValidVersion("no valid version found in tags")  
-            
+    
             if pre_count > 0 and post_count > 0:
                 raise cls.PreAndPostVersionUnsupported("can not parse a version with both pre" \
                                                        " and post release number.")
@@ -479,18 +479,18 @@ class gitversionhelper: # pylint: disable=too-few-public-methods
             _v=None
             try:
                 _v=cls._parseTag(lastTag,**kwargs)
-            except gitversionhelper.version.noValidVersion as _ex:   
+            except gitversionhelper.version.noValidVersion as _ex:
                 if ((cls.__OptDict["ignore_unknown_tags"] in kwargs) and (kwargs[cls.__OptDict["ignore_unknown_tags"]] is True)):
                     tags = gitversionhelper.tag.getTags(sort= "taggerdate",**kwargs)
-                    _v=None
+                    _v = None
                     for _tag in tags:
                         try:
                             _v=cls._parseTag(_tag,**kwargs)
-                            break;
+                            break
                         except gitversionhelper.version.noValidVersion:
                             continue
                 if _v is None:
-                    raise gitversionhelper.version.noValidVersion() from _ex  
+                    raise gitversionhelper.version.noValidVersion() from _ex
 
             if ((cls.__OptDict["formated_output"] in kwargs) and (kwargs[cls.__OptDict["formated_output"]] is True)):
                 return _v.doFormatVersion(**kwargs)