diff --git a/lower-constraints.txt b/lower-constraints.txt
index 2aad60b7..50fd7526 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -1,4 +1,4 @@
-alembic==0.8.10
+alembic==0.9.6
 appdirs==1.3.0
 Babel==2.3.4
 bandit==1.4.0
diff --git a/oslo_db/sqlalchemy/test_migrations.py b/oslo_db/sqlalchemy/test_migrations.py
index 4b8cb128..8c8484b5 100644
--- a/oslo_db/sqlalchemy/test_migrations.py
+++ b/oslo_db/sqlalchemy/test_migrations.py
@@ -482,26 +482,6 @@ class ModelsMigrationsSync(object):
                 isinstance(meta_def.arg, expr.False_) and insp_def == "0"
             )
 
-        impl_type = meta_col.type
-        if isinstance(impl_type, types.Variant):
-            impl_type = impl_type.load_dialect_impl(bind.dialect)
-        if isinstance(impl_type, (sqlalchemy.Integer, sqlalchemy.BigInteger)):
-            if meta_def is None or insp_def is None:
-                return meta_def != insp_def
-            insp_def = insp_def.strip("'")
-            return meta_def.arg != insp_def
-
-    @_compare_server_default.dispatch_for('postgresql')
-    def _compare_server_default(bind, meta_col, insp_def, meta_def):
-        if isinstance(meta_col.type, sqlalchemy.Enum):
-            if meta_def is None or insp_def is None:
-                return meta_def != insp_def
-            return insp_def != "'%s'::%s" % (meta_def.arg, meta_col.type.name)
-        elif isinstance(meta_col.type, sqlalchemy.String):
-            if meta_def is None or insp_def is None:
-                return meta_def != insp_def
-            return insp_def != "'%s'::character varying" % meta_def.arg
-
     FKInfo = collections.namedtuple('fk_info', ['constrained_columns',
                                                 'referred_table',
                                                 'referred_columns'])
diff --git a/oslo_db/tests/sqlalchemy/test_migrations.py b/oslo_db/tests/sqlalchemy/test_migrations.py
index 62cbdfb2..17cdf8e6 100644
--- a/oslo_db/tests/sqlalchemy/test_migrations.py
+++ b/oslo_db/tests/sqlalchemy/test_migrations.py
@@ -203,6 +203,7 @@ class ModelsMigrationSyncMixin(test_base._DbTestCase):
             sa.Column('defaulttest4', sa.Enum('first', 'second',
                                               name='testenum'),
                       server_default="first"),
+            sa.Column("defaulttest5", sa.Integer, server_default=sa.text('0')),
             sa.Column('variant', sa.BigInteger()),
             sa.Column('variant2', sa.BigInteger(), server_default='0'),
             sa.Column('fk_check', sa.String(36), nullable=False),
@@ -233,6 +234,8 @@ class ModelsMigrationSyncMixin(test_base._DbTestCase):
             defaulttest4 = sa.Column('defaulttest4', sa.Enum('first', 'second',
                                                              name='testenum'),
                                      server_default="first")
+            defaulttest5 = sa.Column("defaulttest5",
+                                     sa.Integer, server_default=sa.text('0'))
             variant = sa.Column(sa.BigInteger().with_variant(
                 sa.Integer(), 'sqlite'))
             variant2 = sa.Column(sa.BigInteger().with_variant(
@@ -284,6 +287,7 @@ class ModelsMigrationSyncMixin(test_base._DbTestCase):
             sa.Column('defaulttest4',
                       sa.Enum('first', 'second', name='testenum'),
                       server_default="first"),
+            sa.Column("defaulttest5", sa.Integer, server_default=sa.text('0')),
             sa.Column('fk_check', sa.String(36), nullable=False),
             sa.UniqueConstraint('spam', 'foo', name='uniq_cons'),
             sa.ForeignKeyConstraint(['fk_check'], ['table.fk_check']),
@@ -330,6 +334,7 @@ class ModelsMigrationSyncMixin(test_base._DbTestCase):
             sa.Column('defaulttest4',
                       sa.Enum('first', 'second', name='testenum'),
                       server_default="first"),
+            sa.Column("defaulttest5", sa.Integer, server_default=sa.text('0')),
             sa.Column('variant', sa.String(10)),
             sa.Column('fk_check', sa.String(36), nullable=False),
             sa.UniqueConstraint('spam', 'foo', name='uniq_cons'),
diff --git a/requirements.txt b/requirements.txt
index a52b216f..4b30c001 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
-alembic>=0.8.10 # MIT
+alembic>=0.9.6 # MIT
 debtcollector>=1.2.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0