diff --git a/compute_purchase_order/__manifest__.py b/compute_purchase_order/__manifest__.py
index 5b0d038..69d8b12 100644
--- a/compute_purchase_order/__manifest__.py
+++ b/compute_purchase_order/__manifest__.py
@@ -1,7 +1,6 @@
-# -*- encoding: utf-8 -*-
 {
     'name': 'Computed Purchase Order',
-    'version': '10.0.1.0.0',
+    'version': '11.0.1.0.0',
     'category': 'Purchase Order',
     'description': """ todo """,
     'author': 'Coop IT Easy',
diff --git a/compute_purchase_order/models/computed_purchase_order.py b/compute_purchase_order/models/computed_purchase_order.py
index 5cf0769..9df5623 100644
--- a/compute_purchase_order/models/computed_purchase_order.py
+++ b/compute_purchase_order/models/computed_purchase_order.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 from odoo import models, fields, api, SUPERUSER_ID
 from odoo.exceptions import ValidationError
 
@@ -83,12 +82,12 @@ class ComputedPurchaseOrder(models.Model):
             suppliers.add(main_supplier_id)
 
         if len(suppliers) == 0:
-            raise ValidationError(u'No supplier is set for selected articles.')
+            raise ValidationError('No supplier is set for selected articles.')
         elif len(suppliers) == 1:
             return suppliers.pop()
         else:
             raise ValidationError(
-                u'You must select article from a single supplier.')
+                'You must select article from a single supplier.')
 
     def _create_order_lines(self):
         product_tmpl_ids = self._get_selected_products()
@@ -113,7 +112,7 @@ class ComputedPurchaseOrder(models.Model):
                     .browse(supplier_id)
                     .name)
 
-            name = u'CPO {} {}'.format(
+            name = 'CPO {} {}'.format(
                 supplier_name,
                 fields.Date.today())
         else:
@@ -155,8 +154,8 @@ class ComputedPurchaseOrder(models.Model):
         self.ensure_one()
 
         if sum(self.order_line_ids.mapped('purchase_quantity')) == 0:
-            raise ValidationError(u'You need at least a product to generate '
-                                  u'a Purchase Order')
+            raise ValidationError('You need at least a product to generate '
+                                  'a Purchase Order')
 
         PurchaseOrder = self.env['purchase.order']
         PurchaseOrderLine = self.env['purchase.order.line']
diff --git a/compute_purchase_order/models/computed_purchase_order_line.py b/compute_purchase_order/models/computed_purchase_order_line.py
index 161d48e..9963c2e 100644
--- a/compute_purchase_order/models/computed_purchase_order_line.py
+++ b/compute_purchase_order/models/computed_purchase_order_line.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 import logging
 
 from odoo import models, fields, api
@@ -151,13 +150,13 @@ class ComputedPurchaseOrderLine(models.Model):
 
                 if len(si) == 0:
                     raise ValidationError(
-                        u'No supplier information set for {name}'
+                        'No supplier information set for {name}'
                         .format(name=cpol.product_template_id.name))
                 elif len(si) == 1:
                     cpol.supplierinfo_id = si
                 else:
                     _logger.warning(
-                        u'product {name} has several suppliers, chose last'
+                        'product {name} has several suppliers, chose last'
                         .format(name=cpol.product_template_id.name)
                     )
                     si = si.sorted(key=lambda r: r.create_date, reverse=True)
@@ -167,10 +166,10 @@ class ComputedPurchaseOrderLine(models.Model):
     def _check_minimum_purchase_quantity(self):
         for cpol in self:
             if cpol.purchase_quantity < 0:
-                raise ValidationError(u'Purchase quantity for {product_name} must be greater than 0'  # noqa
+                raise ValidationError('Purchase quantity for {product_name} must be greater than 0'  # noqa
                                         .format(product_name=cpol.product_template_id.name))
             elif 0 < cpol.purchase_quantity < cpol.minimum_purchase_qty:
-                raise ValidationError(u'Purchase quantity for {product_name} must be greater than {min_qty}'  # noqa
+                raise ValidationError('Purchase quantity for {product_name} must be greater than {min_qty}'  # noqa
                                        .format(product_name=cpol.product_template_id.name,
                                                min_qty=cpol.minimum_purchase_qty))
 
@@ -191,6 +190,6 @@ class ComputedPurchaseOrderLine(models.Model):
             return products[0]
         else:
             raise ValidationError(
-                u'%s:%s template has no variant set'
+                '%s:%s template has no variant set'
                 % (self.product_template_id.id, self.product_template_id.name)
             )
diff --git a/compute_purchase_order/models/product_template.py b/compute_purchase_order/models/product_template.py
index 83947be..61bf5e9 100644
--- a/compute_purchase_order/models/product_template.py
+++ b/compute_purchase_order/models/product_template.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 from odoo import models, fields, api
 
 
diff --git a/compute_purchase_order/models/purchase_order.py b/compute_purchase_order/models/purchase_order.py
index e82032d..2c57db6 100644
--- a/compute_purchase_order/models/purchase_order.py
+++ b/compute_purchase_order/models/purchase_order.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 from odoo import models, fields