VERSION      |  2 +-
 doc/news.rst |  6 ++++++
 pyderasn.py  | 13 ++++++++-----

diff --git a/VERSION b/VERSION
index a573d969a3f2b128d2c203089e1393b6fd573bf11e044a16bf1bf61adf5914c3..e0cd78d1060c10e84c9e000baeff98fc8b080145c43ea640274c86e4f4ff267d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.3
+4.4
diff --git a/doc/news.rst b/doc/news.rst
index 858acfdd3601e602c11eeeaa9643c7403026a2e09324c6ad3bb02fc5471732d6..1c0dea1bd46d9c3b5a3333f0208a4f9961306bac997424ddea5779838c6e1107 100644
--- a/doc/news.rst
+++ b/doc/news.rst
@@ -1,6 +1,12 @@
 News
 ====
 
+.. _release4.4:
+
+4.4
+---
+* All errors are inherited from ASN1Error class
+
 .. _release4.3:
 
 4.3
diff --git a/pyderasn.py b/pyderasn.py
index c7433f11a2b3ca2210fd97730d72db35fd1f79c1b84b7f5b0ffbffd2162135bc..a13e1ac5c29842bfe994fe0a382651bb3169eaaa2d5dbccdfe967f77a1eff027 100755
--- a/pyderasn.py
+++ b/pyderasn.py
@@ -642,7 +642,10 @@ ########################################################################
 # Errors
 ########################################################################
 
-class DecodeError(Exception):
+class ASN1Error(ValueError):
+    pass
+
+class DecodeError(ASN1Error):
     def __init__(self, msg="", klass=None, decode_path=(), offset=0):
         """
         :param str msg: reason of decode failing
@@ -697,7 +700,7 @@ class InvalidOID(DecodeError):
     pass
 
 
-class ObjUnknown(ValueError):
+class ObjUnknown(ASN1Error):
     def __init__(self, name):
         super(ObjUnknown, self).__init__()
         self.name = name
@@ -709,7 +712,7 @@     def __repr__(self):
         return "%s(%s)" % (self.__class__.__name__, self)
 
 
-class ObjNotReady(ValueError):
+class ObjNotReady(ASN1Error):
     def __init__(self, name):
         super(ObjNotReady, self).__init__()
         self.name = name
@@ -721,7 +724,7 @@     def __repr__(self):
         return "%s(%s)" % (self.__class__.__name__, self)
 
 
-class InvalidValueType(ValueError):
+class InvalidValueType(ASN1Error):
     def __init__(self, expected_types):
         super(InvalidValueType, self).__init__()
         self.expected_types = expected_types
@@ -735,7 +738,7 @@     def __repr__(self):
         return "%s(%s)" % (self.__class__.__name__, self)
 
 
-class BoundsError(ValueError):
+class BoundsError(ASN1Error):
     def __init__(self, bound_min, value, bound_max):
         super(BoundsError, self).__init__()
         self.bound_min = bound_min