diff --git a/src/entities/Development.ts b/src/entities/Development.ts
index ef4a228..08e2a46 100644
--- a/src/entities/Development.ts
+++ b/src/entities/Development.ts
@@ -392,9 +392,9 @@ export class CreateDevelopment {
   @Column()
   provinceActualId: string | null;
   @Column()
-  dateStudyStart: Date | null;
+  dateStudyStart?: Date | null;
   @Column()
-  dateStudyEnd: Date | null;
+  dateStudyEnd?: Date | null;
   @Column()
   actualPeoples: CreateActualPeople[];
   @Column()
@@ -481,9 +481,9 @@ export class UpdateDevelopment {
   @Column()
   provinceActualId: string | null;
   @Column()
-  dateStudyStart: Date | null;
+  dateStudyStart?: Date | null;
   @Column()
-  dateStudyEnd: Date | null;
+  dateStudyEnd?: Date | null;
   @Column()
   actualPeoples: CreateActualPeople[];
   @Column()