diff --git a/backend/src/main/java/org/raddatz/familienarchiv/service/PersonService.java b/backend/src/main/java/org/raddatz/familienarchiv/service/PersonService.java
index db71d24c..10bdda42 100644
--- a/backend/src/main/java/org/raddatz/familienarchiv/service/PersonService.java
+++ b/backend/src/main/java/org/raddatz/familienarchiv/service/PersonService.java
@@ -143,6 +143,7 @@ public class PersonService {
         validateYears(dto.getBirthYear(), dto.getDeathYear());
         Person person = personRepository.findById(id)
                 .orElseThrow(() -> DomainException.notFound(ErrorCode.PERSON_NOT_FOUND, "Person not found: " + id));
+        person.setPersonType(dto.getPersonType());
         person.setTitle(dto.getTitle() == null || dto.getTitle().isBlank() ? null : dto.getTitle().trim());
         person.setFirstName(dto.getFirstName());
         person.setLastName(dto.getLastName());
diff --git a/backend/src/test/java/org/raddatz/familienarchiv/service/PersonServiceTest.java b/backend/src/test/java/org/raddatz/familienarchiv/service/PersonServiceTest.java
index cb059e4e..8a29a3bc 100644
--- a/backend/src/test/java/org/raddatz/familienarchiv/service/PersonServiceTest.java
+++ b/backend/src/test/java/org/raddatz/familienarchiv/service/PersonServiceTest.java
@@ -182,6 +182,23 @@ class PersonServiceTest {
                 .isEqualTo(400);
     }
 
+    // ─── updatePerson (personType) ───────────────────────────────────────────
+
+    @Test
+    void updatePerson_persistsPersonType() {
+        UUID id = UUID.randomUUID();
+        Person person = Person.builder().id(id).firstName("Anna").lastName("Alt").personType(PersonType.PERSON).build();
+        when(personRepository.findById(id)).thenReturn(Optional.of(person));
+        when(personRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+
+        PersonUpdateDTO dto = new PersonUpdateDTO();
+        dto.setFirstName("Anna"); dto.setLastName("Alt"); dto.setPersonType(PersonType.INSTITUTION);
+
+        Person result = personService.updatePerson(id, dto);
+
+        assertThat(result.getPersonType()).isEqualTo(PersonType.INSTITUTION);
+    }
+
     // ─── updatePerson (alias) ─────────────────────────────────────────────────
 
     @Test