diff --git a/src/poetry/core/packages/dependency.py b/src/poetry/core/packages/dependency.py
index 637b8007f..d604b399f 100644
--- a/src/poetry/core/packages/dependency.py
+++ b/src/poetry/core/packages/dependency.py
@@ -106,7 +106,6 @@ def constraint(self) -> VersionConstraint:
 
     @constraint.setter
     def constraint(self, constraint: str | VersionConstraint) -> None:
-
         if isinstance(constraint, str):
             self._constraint = parse_constraint(constraint)
         else: