diff --git a/CHANGELOG b/CHANGELOG
index 4b69788..baec454 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,6 @@
 0.5.3
 - apply patch for Issue 29 by Jonathan Ellis
+- fix Issue 52 by removing needless parameters from object.__new__ calls
 
 0.5.2
 - move sphinx and nose dependencies to extras_require and tests_require
diff --git a/migrate/versioning/util/keyedinstance.py b/migrate/versioning/util/keyedinstance.py
index 9329c4c..d3879f7 100644
--- a/migrate/versioning/util/keyedinstance.py
+++ b/migrate/versioning/util/keyedinstance.py
@@ -14,7 +14,7 @@ class KeyedInstance(object):
 
         key = cls._key(*p,**k)
         if key not in instances:
-            instances[key] = super(KeyedInstance,cls).__new__(cls,*p,**k)
+            instances[key] = super(KeyedInstance,cls).__new__(cls)
         self = instances[key]
         return self
 
diff --git a/migrate/versioning/version.py b/migrate/versioning/version.py
index 73e6416..711c978 100644
--- a/migrate/versioning/version.py
+++ b/migrate/versioning/version.py
@@ -9,7 +9,7 @@ class VerNum(object):
     def __new__(cls,value):
         val=str(value)
         if val not in cls._instances:
-            cls._instances[val] = super(VerNum,cls).__new__(cls,value)
+            cls._instances[val] = super(VerNum,cls).__new__(cls)
         ret = cls._instances[val]
         return ret
     def __init__(self,value):