diff --git a/sign_oca/models/sign_oca_request.py b/sign_oca/models/sign_oca_request.py
index b0fd30f..9d33e61 100644
--- a/sign_oca/models/sign_oca_request.py
+++ b/sign_oca/models/sign_oca_request.py
@@ -21,7 +21,6 @@
 
 
 class SignOcaRequest(models.Model):
-
     _name = "sign.oca.request"
     _inherit = ["mail.thread", "mail.activity.mixin"]
     _description = "Sign Request"
@@ -343,7 +342,6 @@ def create(self, vals_list):
 
 
 class SignOcaRequestSigner(models.Model):
-
     _name = "sign.oca.request.signer"
     _inherit = "portal.mixin"
     _description = "Sign Request Value"
diff --git a/sign_oca/models/sign_oca_template.py b/sign_oca/models/sign_oca_template.py
index 860a84e..18fc6a5 100644
--- a/sign_oca/models/sign_oca_template.py
+++ b/sign_oca/models/sign_oca_template.py
@@ -5,7 +5,6 @@
 
 
 class SignOcaTemplate(models.Model):
-
     _name = "sign.oca.template"
     _description = "Sign Oca Template"  # TODO
     _inherit = ["mail.thread"]
@@ -131,7 +130,6 @@ def _prepare_sign_oca_request_vals_from_record(self, record):
 
 
 class SignOcaTemplateItem(models.Model):
-
     _name = "sign.oca.template.item"
     _description = "Sign Oca Template Item"
 
diff --git a/sign_oca/pyproject.toml b/sign_oca/pyproject.toml
new file mode 100644
index 0000000..4231d0c
--- /dev/null
+++ b/sign_oca/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["whool"]
+build-backend = "whool.buildapi"
diff --git a/sign_oca/wizards/sign_oca_template_generate.py b/sign_oca/wizards/sign_oca_template_generate.py
index cb5311b..64f88ae 100644
--- a/sign_oca/wizards/sign_oca_template_generate.py
+++ b/sign_oca/wizards/sign_oca_template_generate.py
@@ -5,7 +5,6 @@
 
 
 class SignOcaTemplateGenerate(models.TransientModel):
-
     _name = "sign.oca.template.generate"
     _description = "Generate a signature request"