diff --git a/sql/manual_changes/2026-06-11-alter-m-patient-dob-to-varchar.sql b/sql/manual_changes/2026-06-11-alter-m-patient-dob-to-varchar.sql
new file mode 100644
index 00000000..45e9c3fc
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+++ b/sql/manual_changes/2026-06-11-alter-m-patient-dob-to-varchar.sql
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+-- Ganti tipe M_PatientDOB dari DATE ke VARCHAR
+-- agar nilai masked (**-**-YYYY) bisa tersimpan sebagai string
+-- Nilai asli DOB ada di M_PatientDOB_enc (AES-256-GCM)
+ALTER TABLE one_lab.m_patient
+  MODIFY COLUMN M_PatientDOB VARCHAR(20) NULL DEFAULT NULL;