diff --git a/alembic/versions/0089_sessions_updated_at.py b/alembic/versions/0089_sessions_updated_at.py
new file mode 100644
index 0000000..b014e83
--- /dev/null
+++ b/alembic/versions/0089_sessions_updated_at.py
@@ -0,0 +1,27 @@
+"""Add updated_at column to sessions table.
+
+The Session model uses TimestampMixin which includes updated_at,
+but the sessions table was created without it in migration 0001.
+This causes an error on session creation (login).
+
+Revision ID: 0089
+Revises: 0088
+"""
+
+from __future__ import annotations
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "0089"
+down_revision = "0088"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.execute("ALTER TABLE sessions ADD COLUMN IF NOT EXISTS updated_at TIMESTAMPTZ NOT NULL DEFAULT now()")
+
+
+def downgrade() -> None:
+    op.execute("ALTER TABLE sessions DROP COLUMN IF EXISTS updated_at")