diff --git a/python/MANIFEST.in b/python/MANIFEST.in
index e6e751a..e14e43a 100644
--- a/python/MANIFEST.in
+++ b/python/MANIFEST.in
@@ -1 +1 @@
-include **/data/ERC20.json **/data/GiftableToken.json **/data/GiftableToken.bin *requirements.txt CHANGELOG LICENSE WAIVER WAIVER.asc
+include **/data/ERC20.json **/data/GiftableToken.json **/data/GiftableToken.bin *requirements.txt CHANGELOG LICENSE WAIVER WAIVER.asc **/data/.chainlib 
diff --git a/python/giftable_erc20_token/_clf.py b/python/giftable_erc20_token/_clf.py
new file mode 100644
index 0000000..9b17eee
--- /dev/null
+++ b/python/giftable_erc20_token/_clf.py
@@ -0,0 +1,21 @@
+# local imports
+from .factory import GiftableToken
+
+
+def code(v):
+    version = None
+    if v != None:
+        version = v[0]
+    return GiftableToken.bytecode(version=version)
+
+
+def init(v):
+    if v == None or len(v) < 3:
+        raise ValueError('minimum 3 arguments required')
+    version = None
+    if len(v) == 4:
+        version = v[4]
+    return GiftableToken.cargs(v[0], v[1], v[2], version=version)
+
+
+default = code
diff --git a/python/giftable_erc20_token/factory.py b/python/giftable_erc20_token/factory.py
index 4ec94bf..d1e95bf 100644
--- a/python/giftable_erc20_token/factory.py
+++ b/python/giftable_erc20_token/factory.py
@@ -24,16 +24,22 @@ class GiftableToken(TxFactory):
     __abi = None
     __bytecode = None
 
-    def constructor(self, sender_address, name, symbol, decimals, tx_format=TxFormat.JSONRPC):
-        code = GiftableToken.bytecode()
+    def constructor(self, sender_address, name, symbol, decimals, tx_format=TxFormat.JSONRPC, version=None):
+        code = constructor_arg(name, symbol, decimals)
+        tx = self.template(sender_address, None, use_nonce=True)
+        tx = self.set_code(tx, code)
+        return self.finalize(tx, tx_format)
+
+
+    @staticmethod
+    def cargs(name, symbol, decimals, version=None):
+        code = GiftableToken.bytecode(version=version)
         enc = ABIContractEncoder()
         enc.string(name)
         enc.string(symbol)
         enc.uint256(decimals)
         code += enc.get()
-        tx = self.template(sender_address, None, use_nonce=True)
-        tx = self.set_code(tx, code)
-        return self.finalize(tx, tx_format)
+        return code
 
 
     @staticmethod
@@ -51,7 +57,7 @@ class GiftableToken(TxFactory):
 
 
     @staticmethod
-    def bytecode():
+    def bytecode(version=None):
         if GiftableToken.__bytecode == None:
             f = open(os.path.join(data_dir, 'GiftableToken.bin'))
             GiftableToken.__bytecode = f.read()
diff --git a/python/requirements.txt b/python/requirements.txt
index d8eec4c..90f3e07 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -1,3 +1,4 @@
 confini~=0.6.1
 chainlib-eth~=0.4.15
+chainlib~=0.4.8
 potaahto~=0.1.1
diff --git a/python/setup.cfg b/python/setup.cfg
index f65d4ca..e3b1e12 100644
--- a/python/setup.cfg
+++ b/python/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = eth-erc20
-version = 0.5.4
+version = 0.5.5
 description = ERC20 interface and simple contract with deployment script that lets any address mint and gift itself tokens.
 author = Louis Holbrook
 author_email = dev@holbrook.no