diff --git a/plugins/check_otp b/plugins/check_otp
index 460bba9..7c7072b 100755
--- a/plugins/check_otp
+++ b/plugins/check_otp
@@ -1,11 +1,11 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 #
 # check_otp - Nagios check plugin for LinOTP/PrivacyIDEA OTP validation
 #
-# Version 1.1, latest version, documentation and bugtracker available at:
+# Version 1.2, latest version, documentation and bugtracker available at:
 #              https://gitlab.lindenaar.net/scripts/nagios-plugins
 #
-# Copyright (c) 2018 Frederik Lindenaar
+# Copyright (c) 2018 - 2024 Frederik Lindenaar
 #
 # This script is free software: you can redistribute and/or modify it under the
 # terms of version 3 of the GNU General Public License as published by the Free
@@ -23,8 +23,8 @@ from time import time
 from struct import pack
 from hashlib import sha1
 from getpass import getpass
-from urllib import urlencode
-from urllib2 import Request, HTTPError, URLError, urlopen
+from urllib.parse import urlencode
+from urllib.request import Request, HTTPError, URLError, urlopen
 from ssl import CertificateError, \
                 create_default_context as create_default_SSL_context, \
                 _create_unverified_context as create_unverified_SSL_context
@@ -33,7 +33,7 @@ from argparse import ArgumentParser as StandardArgumentParser, FileType, \
               _StoreAction as StoreAction, _StoreConstAction as StoreConstAction
 
 # Constants (no need to change but allows for easy customization)
-VERSION="1.1"
+VERSION="1.2"
 PROG_NAME=os.path.splitext(os.path.basename(__file__))[0]
 PROG_VERSION=PROG_NAME + ' ' + VERSION
 HTTP_AGENT=PROG_NAME + '/' + VERSION
@@ -404,7 +404,7 @@ def nagios_exit(status, message, data=None):
                         if isinstance(v,list) else v) for k,v in data ])
         else:
             perfdata = ''
-        print 'OTP %s: %s%s' % (status[0], message, perfdata)
+        print('OTP %s: %s%s' % (status[0], message, perfdata))
     sys.exit(status[1])
 
 
@@ -412,9 +412,9 @@ if __name__ == '__main__':
     try:
         args = parse_args()
     except ArgumentParserError as e:
-        nagios_exit(NAGIOS_UNKNOWN,'error with setup: ' + e.message)
+        nagios_exit(NAGIOS_UNKNOWN,'error with setup: ' + ','.join(e.args))
     except (KeyboardInterrupt, EOFError) as e:
-        print
+        print()
         nagios_exit(NAGIOS_UNKNOWN,'initialization aborted')
 
     message = args.func.__name__ + ' authentication'
diff --git a/plugins/check_temperature b/plugins/check_temperature
index f9a79e9..6f1e27a 100755
--- a/plugins/check_temperature
+++ b/plugins/check_temperature
@@ -1,11 +1,11 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 #
 # check_temperature - Nagios temperature check for RaspberryPi-connected sensors
 #
-# Version 1.2, latest version, documentation and bugtracker available at:
-#              https://gitlab.lindenaar.net/scripts/nagios-plugins
+# Version 1.3 latest version, documentation and bugtracker available at:
+#             https://gitlab.lindenaar.net/scripts/nagios-plugins
 #
-# Copyright (c) 2017 - 2019 Frederik Lindenaar
+# Copyright (c) 2017 - 2024 Frederik Lindenaar
 #
 # This script is free software: you can redistribute and/or modify it under the
 # terms of version 3 of the GNU General Public License as published by the Free
@@ -27,7 +27,7 @@ from argparse import ArgumentParser as StandardArgumentParser, FileType, \
 import logging
 
 # Constants (no need to change but allows for easy customization)
-VERSION="1.2"
+VERSION="1.3"
 PROG_NAME=splitext(basename(__file__))[0]
 PROG_VERSION=PROG_NAME + ' ' + VERSION
 
@@ -397,7 +397,7 @@ def parse_args():
     parser.add_argument('-l', '--logfile',  action=SetLogFile,
                         help='send logging output to logfile')
 
-    subparser = parser.add_subparsers(title='Supported temperature sensors')
+    subparser = parser.add_subparsers(title='Supported temperature sensors', required=True)
 
     cpuparser = ArgumentParser(add_help=False)
     cpuparser.add_argument('-f', '--file', default=CPU_SENSOR_DEV,
@@ -469,7 +469,7 @@ def nagios_exit(status, message, data=None):
                         if isinstance(v,list) else v) for k,v in data ])
         else:
             perfdata = ''
-        print 'Temperature %s: %s%s' % (status[0], message, perfdata)
+        print('Temperature %s: %s%s' % (status[0], message, perfdata))
     exit(status[1])
 
 
@@ -478,9 +478,9 @@ if __name__ == '__main__':
     try:
         args = parse_args()
     except ArgumentParserError as e:
-        nagios_exit(NAGIOS_UNKNOWN,'error with setup: ' + e.message)
+        nagios_exit(NAGIOS_UNKNOWN,'error with setup: ' + ','.join(e.args))
     except (KeyboardInterrupt, EOFError) as e:
-        print
+        print()
         nagios_exit(NAGIOS_UNKNOWN,'initialization aborted')
 
     try: