diff --git a/cloudkitty/common/db/models.py b/cloudkitty/common/db/models.py
index c7c934ba..2005f74f 100644
--- a/cloudkitty/common/db/models.py
+++ b/cloudkitty/common/db/models.py
@@ -13,7 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 #
-from sqlalchemy.ext import declarative
+from sqlalchemy.orm import declarative_base
 
 NAMING_CONVENTION = {
     "ix": 'ix_%(column_0_label)s',
@@ -24,6 +24,6 @@ NAMING_CONVENTION = {
 
 
 def get_base():
-    base = declarative.declarative_base()
+    base = declarative_base()
     base.metadata.naming_convention = NAMING_CONVENTION
     return base
diff --git a/cloudkitty/db/sqlalchemy/models.py b/cloudkitty/db/sqlalchemy/models.py
index f0ca6910..76c4c36e 100644
--- a/cloudkitty/db/sqlalchemy/models.py
+++ b/cloudkitty/db/sqlalchemy/models.py
@@ -15,10 +15,10 @@
 #
 from oslo_db.sqlalchemy import models
 import sqlalchemy
-from sqlalchemy.ext import declarative
+from sqlalchemy.orm import declarative_base
 
 
-Base = declarative.declarative_base()
+Base = declarative_base()
 
 
 class StateInfo(Base, models.ModelBase):
diff --git a/cloudkitty/rating/hash/db/sqlalchemy/alembic/models/f8c799db4aa0_fix_unnamed_constraints.py b/cloudkitty/rating/hash/db/sqlalchemy/alembic/models/f8c799db4aa0_fix_unnamed_constraints.py
index 741375f0..4083816c 100644
--- a/cloudkitty/rating/hash/db/sqlalchemy/alembic/models/f8c799db4aa0_fix_unnamed_constraints.py
+++ b/cloudkitty/rating/hash/db/sqlalchemy/alembic/models/f8c799db4aa0_fix_unnamed_constraints.py
@@ -15,7 +15,6 @@
 #
 from oslo_db.sqlalchemy import models
 import sqlalchemy
-from sqlalchemy.ext import declarative
 from sqlalchemy import orm
 from sqlalchemy import schema
 
@@ -110,7 +109,7 @@ class HashMapField(Base, HashMapBase):
     fk_to_resolve = {
         'service_id': 'service.service_id'}
 
-    @declarative.declared_attr
+    @orm.declared_attr
     def __table_args__(cls):
         args = (
             schema.UniqueConstraint(
@@ -205,7 +204,7 @@ class HashMapMapping(Base, HashMapBase):
         'field_id': 'field.field_id',
         'group_id': 'group.group_id'}
 
-    @declarative.declared_attr
+    @orm.declared_attr
     def __table_args__(cls):
         args = (
             schema.UniqueConstraint(
@@ -277,7 +276,7 @@ class HashMapThreshold(Base, HashMapBase):
         'field_id': 'field.field_id',
         'group_id': 'group.group_id'}
 
-    @declarative.declared_attr
+    @orm.declared_attr
     def __table_args__(cls):
         args = (
             schema.UniqueConstraint(
diff --git a/cloudkitty/rating/hash/db/sqlalchemy/models.py b/cloudkitty/rating/hash/db/sqlalchemy/models.py
index 2927e492..6b3bf4c9 100644
--- a/cloudkitty/rating/hash/db/sqlalchemy/models.py
+++ b/cloudkitty/rating/hash/db/sqlalchemy/models.py
@@ -15,7 +15,6 @@
 #
 from oslo_db.sqlalchemy import models
 import sqlalchemy
-from sqlalchemy.ext import declarative
 from sqlalchemy import orm
 from sqlalchemy import schema
 
@@ -111,7 +110,7 @@ class HashMapField(Base, HashMapBase):
     fk_to_resolve = {
         'service_id': 'service.service_id'}
 
-    @declarative.declared_attr
+    @orm.declared_attr
     def __table_args__(cls):
         args = (
             schema.UniqueConstraint(
@@ -202,7 +201,7 @@ class HashMapMapping(Base, HashMapBase, VolatileAuditableModel):
         'field_id': 'field.field_id',
         'group_id': 'group.group_id'}
 
-    @declarative.declared_attr
+    @orm.declared_attr
     def __table_args__(cls):
         args = (
             schema.UniqueConstraint(
@@ -281,7 +280,7 @@ class HashMapThreshold(Base, HashMapBase):
         'field_id': 'field.field_id',
         'group_id': 'group.group_id'}
 
-    @declarative.declared_attr
+    @orm.declared_attr
     def __table_args__(cls):
         args = (
             schema.UniqueConstraint(
diff --git a/cloudkitty/rating/pyscripts/db/sqlalchemy/models.py b/cloudkitty/rating/pyscripts/db/sqlalchemy/models.py
index ff043f1c..7968f250 100644
--- a/cloudkitty/rating/pyscripts/db/sqlalchemy/models.py
+++ b/cloudkitty/rating/pyscripts/db/sqlalchemy/models.py
@@ -18,12 +18,12 @@ import zlib
 
 from oslo_db.sqlalchemy import models
 import sqlalchemy
-from sqlalchemy.ext import declarative
 from sqlalchemy.ext import hybrid
+from sqlalchemy.orm import declarative_base
 
 from cloudkitty.rating.common.db.models import VolatileAuditableModel
 
-Base = declarative.declarative_base()
+Base = declarative_base()
 
 
 class PyScriptsBase(models.ModelBase):
diff --git a/cloudkitty/storage/v1/hybrid/models.py b/cloudkitty/storage/v1/hybrid/models.py
index c04312b6..59817226 100644
--- a/cloudkitty/storage/v1/hybrid/models.py
+++ b/cloudkitty/storage/v1/hybrid/models.py
@@ -15,9 +15,9 @@
 #
 from oslo_db.sqlalchemy import models
 import sqlalchemy
-from sqlalchemy.ext import declarative
+from sqlalchemy.orm import declarative_base
 
-Base = declarative.declarative_base()
+Base = declarative_base()
 
 
 class TenantState(Base, models.ModelBase):
diff --git a/cloudkitty/storage/v1/sqlalchemy/models.py b/cloudkitty/storage/v1/sqlalchemy/models.py
index b469a6e3..d2ed844f 100644
--- a/cloudkitty/storage/v1/sqlalchemy/models.py
+++ b/cloudkitty/storage/v1/sqlalchemy/models.py
@@ -15,12 +15,12 @@
 #
 from oslo_db.sqlalchemy import models
 import sqlalchemy
-from sqlalchemy.ext import declarative
+from sqlalchemy.orm import declarative_base
 
 from cloudkitty.utils import json
 
 
-Base = declarative.declarative_base()
+Base = declarative_base()
 
 
 class RatedDataFrame(Base, models.ModelBase):
diff --git a/cloudkitty/storage_state/alembic/versions/750d3050_create_last_processed_timestamp_column.py b/cloudkitty/storage_state/alembic/versions/750d3050_create_last_processed_timestamp_column.py
index c479f3c3..94cdf884 100644
--- a/cloudkitty/storage_state/alembic/versions/750d3050_create_last_processed_timestamp_column.py
+++ b/cloudkitty/storage_state/alembic/versions/750d3050_create_last_processed_timestamp_column.py
@@ -22,7 +22,7 @@ Create Date: 2021-02-08 17:00:00.000
 from alembic import op
 
 import sqlalchemy
-from sqlalchemy.ext import declarative
+from sqlalchemy import orm
 
 from oslo_db.sqlalchemy import models
 
@@ -35,7 +35,7 @@ down_revision = 'c50ed2c19204'
 branch_labels = None
 depends_on = None
 
-Base = declarative.declarative_base()
+Base = orm.declarative_base()
 
 
 def upgrade():
@@ -53,7 +53,7 @@ def upgrade():
 class IdentifierTableForThisDataBaseModelChangeSet(Base, models.ModelBase):
     """Represents the state of a given identifier."""
 
-    @declarative.declared_attr
+    @orm.declared_attr
     def __table_args__(cls):
         return (
             sqlalchemy.schema.UniqueConstraint(
diff --git a/cloudkitty/storage_state/alembic/versions/c50ed2c19204_update_storage_state_constraint.py b/cloudkitty/storage_state/alembic/versions/c50ed2c19204_update_storage_state_constraint.py
index d87b9e5e..130650bf 100644
--- a/cloudkitty/storage_state/alembic/versions/c50ed2c19204_update_storage_state_constraint.py
+++ b/cloudkitty/storage_state/alembic/versions/c50ed2c19204_update_storage_state_constraint.py
@@ -24,7 +24,7 @@ from alembic import op
 from oslo_db.sqlalchemy import models
 
 import sqlalchemy
-from sqlalchemy.ext import declarative
+from sqlalchemy import orm
 
 # revision identifiers, used by Alembic.
 revision = 'c50ed2c19204'
@@ -32,7 +32,7 @@ down_revision = 'd9d103dd4dcf'
 branch_labels = None
 depends_on = None
 
-Base = declarative.declarative_base()
+Base = orm.declarative_base()
 
 
 def upgrade():
@@ -53,7 +53,7 @@ def upgrade():
 class IdentifierTableForThisDataBaseModelChangeSet(Base, models.ModelBase):
     """Represents the state of a given identifier."""
 
-    @declarative.declared_attr
+    @orm.declared_attr
     def __table_args__(cls):
         return (
             sqlalchemy.schema.UniqueConstraint(
diff --git a/cloudkitty/storage_state/models.py b/cloudkitty/storage_state/models.py
index 55cff8f8..2f339a98 100644
--- a/cloudkitty/storage_state/models.py
+++ b/cloudkitty/storage_state/models.py
@@ -15,9 +15,9 @@
 #
 from oslo_db.sqlalchemy import models
 import sqlalchemy
-from sqlalchemy.ext import declarative
+from sqlalchemy import orm
 
-Base = declarative.declarative_base()
+Base = orm.declarative_base()
 
 
 def to_string_selected_fields(object_to_print, fields=[]):
@@ -31,7 +31,7 @@ def to_string_selected_fields(object_to_print, fields=[]):
 class IdentifierState(Base, models.ModelBase):
     """Represents the state of a given identifier."""
 
-    @declarative.declared_attr
+    @orm.declared_attr
     def __table_args__(cls):
         return (
             sqlalchemy.schema.UniqueConstraint(
@@ -74,7 +74,7 @@ class IdentifierState(Base, models.ModelBase):
 class ReprocessingScheduler(Base, models.ModelBase):
     """Represents the reprocessing scheduler table."""
 
-    @declarative.declared_attr
+    @orm.declared_attr
     def __table_args__(cls):
         return (
             sqlalchemy.schema.PrimaryKeyConstraint('id'),
diff --git a/requirements.txt b/requirements.txt
index 56b61bea..cf2bab68 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,7 +24,7 @@ oslo.policy>=4.5.0 # Apache-2.0
 oslo.utils>=4.7.0 # Apache-2.0
 oslo.upgradecheck>=1.3.0 # Apache-2.0
 python-dateutil>=2.8.0 # BSD
-SQLAlchemy>=1.3.20 # MIT
+SQLAlchemy>=1.4.0 # MIT
 stevedore>=3.2.2 # Apache-2.0
 tooz>=2.7.1 # Apache-2.0
 voluptuous>=0.12.0 # BSD License