diff --git a/card/utils.py b/card/utils.py
index 028e918..f018cef 100644
--- a/card/utils.py
+++ b/card/utils.py
@@ -351,7 +351,7 @@ def write_dict(dict, fd):
         rec = dict[k]
         if isinstance(rec, list) and \
         len(rec) == [isinstance(i, int) for i in rec].count(True):
-            rec = ''.join(['[', ', '.join(map(hex, rec)), ']'])
+            rec = ''.join(['[', ', '.join(list(map(hex, rec))), ']'])
         fd.write('%s: %s\n' % (k, rec))
 
 def make_graph(FS, master_name='(0x3F, 0x00)\nMF'):
diff --git a/common.py b/common.py
index e2d15f8..330d9ed 100644
--- a/common.py
+++ b/common.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 """
diff --git a/simcard.py b/simcard.py
index 4d8b7fe..50cdef7 100644
--- a/simcard.py
+++ b/simcard.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 """
diff --git a/sysmo-isim-tool.sja2.py b/sysmo-isim-tool.sja2.py
index 280fed2..ff62000 100755
--- a/sysmo-isim-tool.sja2.py
+++ b/sysmo-isim-tool.sja2.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 """
diff --git a/sysmo-usim-tool.sjs1.py b/sysmo-usim-tool.sjs1.py
index 10c1e91..ebe0137 100755
--- a/sysmo-usim-tool.sjs1.py
+++ b/sysmo-usim-tool.sjs1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 """
diff --git a/sysmo_isim_sja2.py b/sysmo_isim_sja2.py
index 49ed2ad..037f34c 100644
--- a/sysmo_isim_sja2.py
+++ b/sysmo_isim_sja2.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 """
diff --git a/sysmo_usim.py b/sysmo_usim.py
index 287b7cf..414038d 100644
--- a/sysmo_usim.py
+++ b/sysmo_usim.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 """
diff --git a/sysmo_usim_sjs1.py b/sysmo_usim_sjs1.py
index efa30a6..01777e0 100644
--- a/sysmo_usim_sjs1.py
+++ b/sysmo_usim_sjs1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 """
diff --git a/utils.py b/utils.py
index 311b8d2..1185a0f 100644
--- a/utils.py
+++ b/utils.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 """
@@ -52,9 +52,9 @@ def ascii_to_list(string):
 # Convert an ascii hex string to numeric list
 def asciihex_to_list(string):
 
-	string = string.translate(None, ':')
+	string = string.translate(str.maketrans('','',':'))
 	try:
-		return map(ord, string.decode("hex"))
+		return list(map(ord,''.join(['%c' % b for b in bytearray.fromhex(string)])))
 	except:
 		print("Warning: Invalid hex string -- ignored!")
 		return []