diff --git a/requirements.txt b/requirements.txt
index 5f267f8cae..2186a97932 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,3 @@
 # generated from manifests external_dependencies
 pdf2image
-python-stdnum
 pyzbar
diff --git a/sequence_check_digit/__manifest__.py b/sequence_check_digit/__manifest__.py
index a582829a06..effb4e2b65 100644
--- a/sequence_check_digit/__manifest__.py
+++ b/sequence_check_digit/__manifest__.py
@@ -3,7 +3,7 @@
 
 {
     "name": "Check Digit on Sequences",
-    "version": "14.0.1.0.2",
+    "version": "15.0.1.0.0",
     "category": "Reporting",
     "website": "https://github.com/OCA/server-ux",
     "author": "Creu Blanca, Odoo Community Association (OCA)",
@@ -13,5 +13,4 @@
     "summary": "Adds a check digit on sequences",
     "depends": ["base"],
     "data": ["views/sequence_views.xml"],
-    "external_dependencies": {"python": ["python-stdnum"]},
 }
diff --git a/sequence_check_digit/models/ir_sequence.py b/sequence_check_digit/models/ir_sequence.py
index fbbf8e8562..7e1672992b 100644
--- a/sequence_check_digit/models/ir_sequence.py
+++ b/sequence_check_digit/models/ir_sequence.py
@@ -37,17 +37,17 @@ def check_check_digit_formula(self):
         try:
             self.get_next_char(0)
         except Exception:
-            raise ValidationError(_("Format is not accepted"))
+            raise ValidationError(_("Format is not accepted")) from None
 
     def get_check_digit(self, code):
         try:
             return self.get_formula_map()[self.check_digit_formula](code)
         except KeyError:
             raise ValidationError(
-                _("%s is not an implemented function" % self.check_digit_formula)
-            )
+                _("%s is not an implemented function") % self.check_digit_formula
+            ) from None
         except Exception:
-            raise ValidationError(_("Format is not accepted"))
+            raise ValidationError(_("Format is not accepted")) from None
 
     def get_formula_map(self):
         return {