diff --git a/pyproject.toml b/pyproject.toml
index 9c2a9b2..8cb6a6c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ classifiers = [
 requires-python = ">= 3.8"
 dependencies = [
         "SQLAlchemy-Continuum",
-        "WuttJamaican[db]",
+        "WuttJamaican[db]>=0.17.0",
 ]
 
 
diff --git a/src/wutta_continuum/db/alembic/versions/71406251b8e7_first_versioning_tables.py b/src/wutta_continuum/db/alembic/versions/71406251b8e7_first_versioning_tables.py
index fe54b41..1cc4c20 100644
--- a/src/wutta_continuum/db/alembic/versions/71406251b8e7_first_versioning_tables.py
+++ b/src/wutta_continuum/db/alembic/versions/71406251b8e7_first_versioning_tables.py
@@ -9,6 +9,7 @@ from typing import Sequence, Union
 
 from alembic import op
 import sqlalchemy as sa
+import wuttjamaican.db.util
 
 
 # revision identifiers, used by Alembic.
@@ -25,7 +26,7 @@ def upgrade() -> None:
                     sa.Column('issued_at', sa.DateTime(), nullable=True),
                     sa.Column('id', sa.BigInteger(), autoincrement=True, nullable=False),
                     sa.Column('remote_addr', sa.String(length=50), nullable=True),
-                    sa.Column('user_id', sa.String(length=32), nullable=True),
+                    sa.Column('user_id', wuttjamaican.db.util.UUID(), nullable=True),
                     sa.ForeignKeyConstraint(['user_id'], ['user.uuid'], name=op.f('fk_transaction_user_id_user')),
                     sa.PrimaryKeyConstraint('id', name=op.f('pk_transaction'))
                     )
@@ -33,7 +34,7 @@ def upgrade() -> None:
 
     # person
     op.create_table('person_version',
-                    sa.Column('uuid', sa.String(length=32), autoincrement=False, nullable=False),
+                    sa.Column('uuid', wuttjamaican.db.util.UUID(), autoincrement=False, nullable=False),
                     sa.Column('full_name', sa.String(length=100), autoincrement=False, nullable=True),
                     sa.Column('first_name', sa.String(length=50), autoincrement=False, nullable=True),
                     sa.Column('middle_name', sa.String(length=50), autoincrement=False, nullable=True),
@@ -49,10 +50,10 @@ def upgrade() -> None:
 
     # user
     op.create_table('user_version',
-                    sa.Column('uuid', sa.String(length=32), autoincrement=False, nullable=False),
+                    sa.Column('uuid', wuttjamaican.db.util.UUID(), autoincrement=False, nullable=False),
                     sa.Column('username', sa.String(length=25), autoincrement=False, nullable=True),
                     sa.Column('password', sa.String(length=60), autoincrement=False, nullable=True),
-                    sa.Column('person_uuid', sa.String(length=32), autoincrement=False, nullable=True),
+                    sa.Column('person_uuid', wuttjamaican.db.util.UUID(), autoincrement=False, nullable=True),
                     sa.Column('active', sa.Boolean(), autoincrement=False, nullable=True),
                     sa.Column('transaction_id', sa.BigInteger(), autoincrement=False, nullable=False),
                     sa.Column('end_transaction_id', sa.BigInteger(), nullable=True),
@@ -65,7 +66,7 @@ def upgrade() -> None:
 
     # role
     op.create_table('role_version',
-                    sa.Column('uuid', sa.String(length=32), autoincrement=False, nullable=False),
+                    sa.Column('uuid', wuttjamaican.db.util.UUID(), autoincrement=False, nullable=False),
                     sa.Column('name', sa.String(length=100), autoincrement=False, nullable=True),
                     sa.Column('notes', sa.Text(), autoincrement=False, nullable=True),
                     sa.Column('transaction_id', sa.BigInteger(), autoincrement=False, nullable=False),
@@ -79,9 +80,9 @@ def upgrade() -> None:
 
     # user_x_role
     op.create_table('user_x_role_version',
-                    sa.Column('uuid', sa.String(length=32), autoincrement=False, nullable=False),
-                    sa.Column('user_uuid', sa.String(length=32), autoincrement=False, nullable=True),
-                    sa.Column('role_uuid', sa.String(length=32), autoincrement=False, nullable=True),
+                    sa.Column('uuid', wuttjamaican.db.util.UUID(), autoincrement=False, nullable=False),
+                    sa.Column('user_uuid', wuttjamaican.db.util.UUID(), autoincrement=False, nullable=True),
+                    sa.Column('role_uuid', wuttjamaican.db.util.UUID(), autoincrement=False, nullable=True),
                     sa.Column('transaction_id', sa.BigInteger(), autoincrement=False, nullable=False),
                     sa.Column('end_transaction_id', sa.BigInteger(), nullable=True),
                     sa.Column('operation_type', sa.SmallInteger(), nullable=False),
@@ -93,7 +94,7 @@ def upgrade() -> None:
 
     # permission
     op.create_table('permission_version',
-                    sa.Column('role_uuid', sa.String(length=32), autoincrement=False, nullable=False),
+                    sa.Column('role_uuid', wuttjamaican.db.util.UUID(), autoincrement=False, nullable=False),
                     sa.Column('permission', sa.String(length=254), autoincrement=False, nullable=False),
                     sa.Column('transaction_id', sa.BigInteger(), autoincrement=False, nullable=False),
                     sa.Column('end_transaction_id', sa.BigInteger(), nullable=True),