diff --git a/src/main/java/com/eventsourcing/bankAccount/delivery/BankAccountController.java b/src/main/java/com/eventsourcing/bankAccount/delivery/BankAccountController.java
index 152d4e6..8806a54 100644
--- a/src/main/java/com/eventsourcing/bankAccount/delivery/BankAccountController.java
+++ b/src/main/java/com/eventsourcing/bankAccount/delivery/BankAccountController.java
@@ -11,6 +11,7 @@ import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
+import javax.validation.Valid;
 import java.util.UUID;
 
 @RestController
@@ -32,7 +33,7 @@ public class BankAccountController {
     }
 
     @PostMapping
-    public ResponseEntity<String> createBankAccount(@RequestBody CreateBankAccountRequestDTO dto) {
+    public ResponseEntity<String> createBankAccount(@Valid @RequestBody CreateBankAccountRequestDTO dto) {
         final var aggregateID = UUID.randomUUID().toString();
         final var command = new CreateBankAccountCommand(aggregateID, dto.email(), dto.userName(), dto.address());
         final var id = commandService.handle(command);
@@ -41,7 +42,7 @@ public class BankAccountController {
     }
 
     @PostMapping(path = "/deposit/{aggregateId}")
-    public ResponseEntity<Void> depositAmount(@RequestBody DepositAmountRequestDTO dto, @PathVariable String aggregateId) {
+    public ResponseEntity<Void> depositAmount(@Valid @RequestBody DepositAmountRequestDTO dto, @PathVariable String aggregateId) {
         final var command = new DepositAmountCommand(aggregateId, dto.amount());
         commandService.handle(command);
         log.info("DepositAmountCommand command: {}", command);
@@ -49,7 +50,7 @@ public class BankAccountController {
     }
 
     @PostMapping(path = "/email/{aggregateId}")
-    public ResponseEntity<Void> changeEmail(@RequestBody ChangeEmailRequestDTO dto, @PathVariable String aggregateId) {
+    public ResponseEntity<Void> changeEmail(@Valid @RequestBody ChangeEmailRequestDTO dto, @PathVariable String aggregateId) {
         final var command = new ChangeEmailCommand(aggregateId, dto.newEmail());
         commandService.handle(command);
         log.info("ChangeEmailCommand command: {}", command);
@@ -57,7 +58,7 @@ public class BankAccountController {
     }
 
     @PostMapping(path = "/address/{aggregateId}")
-    public ResponseEntity<Void> changeAddress(@RequestBody ChangeAddressRequestDTO dto, @PathVariable String aggregateId) {
+    public ResponseEntity<Void> changeAddress(@Valid @RequestBody ChangeAddressRequestDTO dto, @PathVariable String aggregateId) {
         final var command = new ChangeAddressCommand(aggregateId, dto.newAddress());
         commandService.handle(command);
         log.info("changeAddress command: {}", command);
diff --git a/src/main/java/com/eventsourcing/bankAccount/dto/ChangeAddressRequestDTO.java b/src/main/java/com/eventsourcing/bankAccount/dto/ChangeAddressRequestDTO.java
index d017574..49759c7 100644
--- a/src/main/java/com/eventsourcing/bankAccount/dto/ChangeAddressRequestDTO.java
+++ b/src/main/java/com/eventsourcing/bankAccount/dto/ChangeAddressRequestDTO.java
@@ -1,4 +1,7 @@
 package com.eventsourcing.bankAccount.dto;
 
-public record ChangeAddressRequestDTO(String newAddress) {
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.Size;
+
+public record ChangeAddressRequestDTO(@NotBlank @Size(min = 10, max = 250) String newAddress) {
 }
diff --git a/src/main/java/com/eventsourcing/bankAccount/dto/ChangeEmailRequestDTO.java b/src/main/java/com/eventsourcing/bankAccount/dto/ChangeEmailRequestDTO.java
index 4e2be91..bf54a58 100644
--- a/src/main/java/com/eventsourcing/bankAccount/dto/ChangeEmailRequestDTO.java
+++ b/src/main/java/com/eventsourcing/bankAccount/dto/ChangeEmailRequestDTO.java
@@ -1,4 +1,8 @@
 package com.eventsourcing.bankAccount.dto;
 
-public record ChangeEmailRequestDTO(String newEmail) {
+import javax.validation.constraints.Email;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.Size;
+
+public record ChangeEmailRequestDTO(@Email @NotBlank @Size(min = 10, max = 250) String newEmail) {
 }
diff --git a/src/main/java/com/eventsourcing/bankAccount/dto/CreateBankAccountRequestDTO.java b/src/main/java/com/eventsourcing/bankAccount/dto/CreateBankAccountRequestDTO.java
index 097c08e..08fdcc7 100644
--- a/src/main/java/com/eventsourcing/bankAccount/dto/CreateBankAccountRequestDTO.java
+++ b/src/main/java/com/eventsourcing/bankAccount/dto/CreateBankAccountRequestDTO.java
@@ -1,7 +1,11 @@
 package com.eventsourcing.bankAccount.dto;
 
+import javax.validation.constraints.Email;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.Size;
+
 public record CreateBankAccountRequestDTO(
-        String email,
-        String address,
-        String userName) {
+        @Email @NotBlank @Size(min = 10, max = 250) String email,
+        @NotBlank @Size(min = 10, max = 250) String address,
+        @NotBlank @Size(min = 10, max = 250) String userName) {
 }
diff --git a/src/main/java/com/eventsourcing/bankAccount/dto/DepositAmountRequestDTO.java b/src/main/java/com/eventsourcing/bankAccount/dto/DepositAmountRequestDTO.java
index 499d0b1..1fc73d6 100644
--- a/src/main/java/com/eventsourcing/bankAccount/dto/DepositAmountRequestDTO.java
+++ b/src/main/java/com/eventsourcing/bankAccount/dto/DepositAmountRequestDTO.java
@@ -1,6 +1,8 @@
 package com.eventsourcing.bankAccount.dto;
 
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
 import java.math.BigDecimal;
 
-public record DepositAmountRequestDTO(BigDecimal amount) {
+public record DepositAmountRequestDTO(@Min(value = 300, message = "minimal amount is 300") @NotNull BigDecimal amount) {
 }
\ No newline at end of file