diff --git a/weboob/applications/boobtracker/boobtracker.py b/weboob/applications/boobtracker/boobtracker.py
index 8b82ac88659b008829d8654fc1d9828fc41b770d..d167feeae26d244bef6fef9343554f95f2126527 100644
--- a/weboob/applications/boobtracker/boobtracker.py
+++ b/weboob/applications/boobtracker/boobtracker.py
@@ -21,7 +21,7 @@
 
 from datetime import timedelta
 from email import message_from_string, message_from_file
-from email.Header import decode_header
+from email.header import decode_header
 from email.mime.text import MIMEText
 from smtplib import SMTP
 import os
diff --git a/weboob/applications/boomoney/boomoney.py b/weboob/applications/boomoney/boomoney.py
index ee51b1ab27e58d22a2a69c4e2e35198e7baaeacd..18f9afeaacb660cad83281cfd83ff34f6dca87a8 100644
--- a/weboob/applications/boomoney/boomoney.py
+++ b/weboob/applications/boomoney/boomoney.py
@@ -27,7 +27,7 @@
 from threading import Thread, Lock
 import copy
 import sys
-import StringIO
+from io import StringIO
 import os
 import re
 import subprocess
@@ -163,7 +163,7 @@ def run(self):
                 self.boomoney.importIndex = self.boomoney.importIndex + 1
             return
 
-        boobank.stderr = StringIO.StringIO()
+        boobank.stderr = StringIO()
         boobank.stdout = boobank.stderr
         id, backend = self.account.split("@")
         module_name, foo = boobank.weboob.backends_config.get_backend(backend)
@@ -176,7 +176,7 @@ def run(self):
         content = ''
         boobank.error = False
         while count <= MAX_RETRIES and not (found and not boobank.error):
-            boobank.options.outfile = StringIO.StringIO()
+            boobank.options.outfile = StringIO()
             boobank.error = False
 
             # executing history command
@@ -205,8 +205,8 @@ def run(self):
 
         # postprocessing of the ofx content to match MSMoney expectations
         content = re.sub(r'<BALAMT>Not loaded', r'<BALAMT></BALAMT>', content)
-        input = StringIO.StringIO(content)
-        output = StringIO.StringIO()
+        input = StringIO(content)
+        output = StringIO()
         field = {}
         fields = ' '
         for line in input:
@@ -464,7 +464,7 @@ def save_config(self):
 
     def getList(self):
         self.onecmd("select id label")
-        self.options.outfile = StringIO.StringIO()
+        self.options.outfile = StringIO()
         self.onecmd("list")
         listContent = self.options.outfile.getvalue()
         self.options.outfile.close()
diff --git a/weboob/applications/monboob/monboob.py b/weboob/applications/monboob/monboob.py
index 7d6de2b2db3043688768da3d7b1c43bb84ca97c3..3690c4b9730095e0637387d82bb7fea7efb23361 100644
--- a/weboob/applications/monboob/monboob.py
+++ b/weboob/applications/monboob/monboob.py
@@ -21,8 +21,8 @@
 
 from email.mime.text import MIMEText
 from smtplib import SMTP
-from email.Header import Header, decode_header
-from email.Utils import parseaddr, formataddr, formatdate
+from email.header import Header, decode_header
+from email.utils import parseaddr, formataddr, formatdate
 from email import message_from_file, message_from_string
 from smtpd import SMTPServer
 import time