diff --git a/Lib/dis.py b/Lib/dis.py
index 713d7aa6820..8f74add59f3 100644
--- a/Lib/dis.py
+++ b/Lib/dis.py
@@ -150,6 +150,7 @@ def_op('POP_TOP', 1)
 def_op('ROT_TWO', 2)
 def_op('ROT_THREE', 3)
 def_op('DUP_TOP', 4)
+def_op('ROT_FOUR', 5)
 
 def_op('UNARY_POSITIVE', 10)
 def_op('UNARY_NEGATIVE', 11)
@@ -228,7 +229,7 @@ name_op('STORE_ATTR', 95)	# Index in name list
 name_op('DELETE_ATTR', 96)	# ""
 name_op('STORE_GLOBAL', 97)	# ""
 name_op('DELETE_GLOBAL', 98)	# ""
-
+def_op('DUP_TOPX', 99)		# number of items to duplicate
 def_op('LOAD_CONST', 100)	# Index in const list 
 hasconst.append(100)
 name_op('LOAD_NAME', 101)	# Index in name list