diff --git a/aprendizations/models.py b/aprendizations/models.py
index 2a98717..6a7af62 100644
--- a/aprendizations/models.py
+++ b/aprendizations/models.py
@@ -1,28 +1,31 @@
 
+# FIXME Mapped[...] probably wrong for the relationships. 
+# See sqlalchemy documentation: 
+#   https://docs.sqlalchemy.org/en/20/changelog/whatsnew_20.html
+
+from typing import List
+
 # third party libraries
-from sqlalchemy import Column, ForeignKey, Integer, Float, String
-from sqlalchemy.orm import declarative_base, relationship
+from sqlalchemy import ForeignKey, Integer, Float, String
+# from sqlalchemy.orm import declarative_base, relationship
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
 
 
 # ===========================================================================
-#   Declare ORM
-# FIXME Any is a workaround for mypy static type checking (see https://github.com/python/mypy/issues/6372)
-# from typing import Any
-# Base: Any = declarative_base()
-Base = declarative_base()
-
+class Base(DeclarativeBase):
+    pass
 
 # ---------------------------------------------------------------------------
 class StudentTopic(Base):
     __tablename__ = 'studenttopic'
-    student_id = Column(String, ForeignKey('students.id'), primary_key=True)
-    topic_id = Column(String, ForeignKey('topics.id'), primary_key=True)
-    level = Column(Float)
-    date = Column(String)
+    student_id: Mapped[str] = mapped_column(ForeignKey('students.id'), primary_key=True)
+    topic_id: Mapped[str] = mapped_column(ForeignKey('topics.id'), primary_key=True)
+    level: Mapped[float]
+    date: Mapped[str]
 
-    # ---
-    student = relationship('Student', back_populates='topics')
-    topic = relationship('Topic', back_populates='students')
+    # --- FIXME
+    student: Mapped["Student"] = relationship('Student', back_populates='topics')
+    topic: Mapped["Topic"] = relationship('Topic', back_populates='students')
 
     def __repr__(self):
         return ('StudentTopic('
@@ -37,13 +40,13 @@ class StudentTopic(Base):
 # ---------------------------------------------------------------------------
 class Student(Base):
     __tablename__ = 'students'
-    id = Column(String, primary_key=True)
-    name = Column(String)
-    password = Column(String)
+    id: Mapped[str] = mapped_column(String, primary_key=True)
+    name: Mapped[str]
+    password: Mapped[str]
 
-    # ---
-    answers = relationship('Answer', back_populates='student')
-    topics = relationship('StudentTopic', back_populates='student')
+    # --- FIXME
+    answers: Mapped[List["Answer"]] = relationship('Answer', back_populates='student')
+    topics: Mapped[List["StudentTopic"]] = relationship('StudentTopic', back_populates='student')
 
     def __repr__(self):
         return ('Student('
@@ -57,17 +60,17 @@ class Student(Base):
 # ---------------------------------------------------------------------------
 class Answer(Base):
     __tablename__ = 'answers'
-    id = Column(Integer, primary_key=True)  # auto_increment
-    ref = Column(String)
-    grade = Column(Float)
-    starttime = Column(String)
-    finishtime = Column(String)
-    student_id = Column(String, ForeignKey('students.id'))
-    topic_id = Column(String, ForeignKey('topics.id'))
-
-    # ---
-    student = relationship('Student', back_populates='answers')
-    topic = relationship('Topic', back_populates='answers')
+    id: Mapped[int] = mapped_column(primary_key=True)  # auto_increment
+    ref: Mapped[str]
+    grade: Mapped[float]
+    starttime: Mapped[str]
+    finishtime: Mapped[str]
+    student_id: Mapped[str] = mapped_column(String, ForeignKey('students.id'))
+    topic_id: Mapped[str] = mapped_column(String, ForeignKey('topics.id'))
+
+    # --- FIXME
+    student: Mapped["Student"] = relationship('Student', back_populates='answers')
+    topic: Mapped["Topic"] = relationship('Topic', back_populates='answers')
 
     def __repr__(self):
         return ('Question('
@@ -85,11 +88,11 @@ class Answer(Base):
 # ---------------------------------------------------------------------------
 class Topic(Base):
     __tablename__ = 'topics'
-    id = Column(String, primary_key=True)
+    id: Mapped[str] = mapped_column(primary_key=True)
 
-    # ---
-    students = relationship('StudentTopic', back_populates='topic')
-    answers = relationship('Answer', back_populates='topic')
+    # --- FIXME
+    students: Mapped["StudentTopic"] = relationship('StudentTopic', back_populates='topic')
+    answers: Mapped["Answer"] = relationship('Answer', back_populates='topic')
 
     def __repr__(self):
         return f'Topic(id={self.id!r})'
--
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