diff --git a/api/model/entries.py b/api/model/entries.py
index e6f81a2..225fb39 100644
--- a/api/model/entries.py
+++ b/api/model/entries.py
@@ -30,8 +30,8 @@ class Entry(db.Model):
     account_id = db.Column(db.Integer, db.ForeignKey('account.id'))
     scheduled_operation_id = db.Column(db.Integer, db.ForeignKey('scheduled_operation.id'))
 
-    account = db.relationship(Account, backref = db.backref('entry', lazy="Dynamic"))
-    scheduled_operation = db.relationship(ScheduledOperation, backref = db.backref('entry', lazy="Dynamic"))
+    account = db.relationship(Account, backref = db.backref('entry', lazy="dynamic"))
+    scheduled_operation = db.relationship(ScheduledOperation, backref = db.backref('entry', lazy="dynamic"))
 
     category = db.Column(db.String(100), nullable = True)
 
diff --git a/api/model/operations.py b/api/model/operations.py
index a9f6f1a..42a67aa 100644
--- a/api/model/operations.py
+++ b/api/model/operations.py
@@ -32,7 +32,7 @@ class Operation(db.Model):
     account_id = db.Column(db.Integer, db.ForeignKey('account.id'))
     scheduled_operation_id = db.Column(db.Integer, db.ForeignKey('scheduled_operation.id'))
 
-    account = db.relationship(Account, backref = db.backref('operation', lazy="Dynamic"))
+    account = db.relationship(Account, backref = db.backref('operation', lazy="dynamic"))
 
     category = db.Column(db.String(100), nullable = True)
 
diff --git a/api/model/scheduled_operations.py b/api/model/scheduled_operations.py
index e1bafa1..098ed62 100644
--- a/api/model/scheduled_operations.py
+++ b/api/model/scheduled_operations.py
@@ -14,7 +14,7 @@ class ScheduledOperation(db.Model):
     value = db.Column(db.Numeric(15, 2), nullable = False)
     account_id = db.Column(db.Integer, db.ForeignKey('account.id'))
 
-    account = db.relationship(Account, backref = db.backref('scheduled_operation', lazy="Dynamic"))
+    account = db.relationship(Account, backref = db.backref('scheduled_operation', lazy="dynamic"))
 
     category = db.Column(db.String(100), nullable = True)