diff --git a/app/app.py b/app/app.py
index 36c0c5d..1d46857 100644
--- a/app/app.py
+++ b/app/app.py
@@ -69,13 +69,13 @@ def reconfigure(version):
         #   * com.df.letsencrypt.host
         #   * com.df.letsencrypt.email
         required_labels = ('letsencrypt.host', 'letsencrypt.email')
-        if all([label in args.keys() for label in required_labels]):
+        if all([label in list(args.keys()) for label in required_labels]):
             logger.info('letsencrypt support enabled.')
 
             testing = None
             if 'letsencrypt.testing' in args:
                 testing = args['letsencrypt.testing']
-                if isinstance(testing, basestring):
+                if isinstance(testing, str):
                     testing = True if testing.lower() == 'true' else False
 
             client.process(args['letsencrypt.host'].split(','), args['letsencrypt.email'], testing=testing)
@@ -90,10 +90,10 @@ def reconfigure(version):
         logger.debug('forwarding request to docker-flow-proxy ({})'.format(t))
         try:
             response = dfp_client.get(dfp_client.url(version, '/reconfigure?{}'.format(
-                '&'.join(['{}={}'.format(k, v) for k, v in request.args.items()]))))
+                '&'.join(['{}={}'.format(k, v) for k, v in list(request.args.items())]))))
             if response.status_code == 200:
                 break
-        except Exception, e:
+        except Exception as e:
             logger.error('Error while trying to forward request: {}'.format(e))
         logger.debug('waiting for retry')
         time.sleep(os.environ.get('RETRY_INTERVAL', 5))
diff --git a/app/client_dfple.py b/app/client_dfple.py
index 0729775..a09d321 100644
--- a/app/client_dfple.py
+++ b/app/client_dfple.py
@@ -176,7 +176,7 @@ def process(self, domains, email, version='1', testing=None):
             self.dfp = self.services(self.dfp_service_name)[0]
             self.dfp_secrets = self.service_get_secrets(self.dfp)
 
-        for domain, certs in certs.items():
+        for domain, certs in list(certs.items()):
 
             combined = [x for x in certs if '.pem' in x]
             if len(combined) == 0:
diff --git a/app/client_dfple_tests.py b/app/client_dfple_tests.py
index 705cf63..e5d7f59 100644
--- a/app/client_dfple_tests.py
+++ b/app/client_dfple_tests.py
@@ -292,5 +292,5 @@ def test_secret_created_not_attached(self):
 			# check secrets found and attached
 			for d in self.domains:
 				self.assertTrue(any([d in x.name for x in self.client._secrets]))
-				print('ee', self.client.dfp_secrets)
+				print(('ee', self.client.dfp_secrets))
 				self.assertTrue(any(['{}.pem'.format(d) == x['SecretName'] for x in self.client.dfp_secrets]))
\ No newline at end of file
diff --git a/app/hooks/ovh/manual-auth-hook.py b/app/hooks/ovh/manual-auth-hook.py
index b267488..54bb7a7 100644
--- a/app/hooks/ovh/manual-auth-hook.py
+++ b/app/hooks/ovh/manual-auth-hook.py
@@ -23,10 +23,10 @@
 # update the _acme-challenge. subdomain with a TXT record
 subdomain = '_acme-challenge.{}'.format(CERTBOT_DOMAIN.replace(OVH_DNS_ZONE, ''))[:-1]
 zone = client.post('/domain/zone/{}/record'.format(OVH_DNS_ZONE), fieldType='TXT', subDomain=subdomain, target=CERTBOT_VALIDATION)
-print "Record updated : {}".format(zone)
+print("Record updated : {}".format(zone))
 
 response = client.post('/domain/zone/{}/refresh'.format(OVH_DNS_ZONE))
-print "Zone refreshed : {}".format(response)
+print("Zone refreshed : {}".format(response))
 
 # sleep to make sure the change has time to propagate over to DNS
 time.sleep(60)
\ No newline at end of file
diff --git a/app/hooks/ovh/manual-cleanup-hook.py b/app/hooks/ovh/manual-cleanup-hook.py
index 3f83bd3..e44ee56 100644
--- a/app/hooks/ovh/manual-cleanup-hook.py
+++ b/app/hooks/ovh/manual-cleanup-hook.py
@@ -22,13 +22,13 @@
 # update the _acme-challenge. subdomain with a TXT record
 subdomain = '_acme-challenge.{}'.format(CERTBOT_DOMAIN.replace(OVH_DNS_ZONE, ''))[:-1]
 zones = client.get('/domain/zone/{}/record'.format(OVH_DNS_ZONE), fieldType='TXT', subDomain=subdomain)
-print "zones", zones
+print("zones", zones)
 if len(zones) == 1:
 	zone = zones[0]
 else:
 	raise Exception('Could not find domain matching: {}'.format(CERTBOT_DOMAIN))
 response = client.delete('/domain/zone/{}/record/{}'.format(OVH_DNS_ZONE, zone))
-print "Record deleted : {}".format(response)
+print("Record deleted : {}".format(response))
 
 response = client.post('/domain/zone/{}/refresh'.format(OVH_DNS_ZONE))
-print "Zone refreshed : {}".format(response)
+print("Zone refreshed : {}".format(response))