diff --git a/pom.xml b/pom.xml
index f5a5d2f..b00fc6b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -20,6 +20,11 @@
         <mapstruct.version>1.5.5.Final</mapstruct.version>
     </properties>
     <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+            <version>3.1.4</version>
+        </dependency>
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
diff --git a/src/main/java/com/example/springbootbookshop/controller/BookController.java b/src/main/java/com/example/springbootbookshop/controller/BookController.java
index e188882..cb30a47 100644
--- a/src/main/java/com/example/springbootbookshop/controller/BookController.java
+++ b/src/main/java/com/example/springbootbookshop/controller/BookController.java
@@ -4,6 +4,7 @@
 import com.example.springbootbookshop.dto.CreateBookRequestDto;
 import com.example.springbootbookshop.entity.Book;
 import com.example.springbootbookshop.service.BookService;
+import jakarta.validation.Valid;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatus;
@@ -43,7 +44,7 @@ public BookDto getBookById(@PathVariable Long id) {
 
     @PutMapping(value = "/{id}")
     @ResponseStatus(HttpStatus.OK)
-    public BookDto getBookById(@RequestBody CreateBookRequestDto bookDto,
+    public BookDto updateBookById(@RequestBody @Valid CreateBookRequestDto bookDto,
                                @PathVariable Long id) {
         return bookService.update(bookDto, id);
     }
diff --git a/src/main/java/com/example/springbootbookshop/dto/CreateBookRequestDto.java b/src/main/java/com/example/springbootbookshop/dto/CreateBookRequestDto.java
index 7efc908..2a2267a 100644
--- a/src/main/java/com/example/springbootbookshop/dto/CreateBookRequestDto.java
+++ b/src/main/java/com/example/springbootbookshop/dto/CreateBookRequestDto.java
@@ -1,11 +1,14 @@
 package com.example.springbootbookshop.dto;
 
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Positive;
 import java.math.BigDecimal;
 
-public record CreateBookRequestDto(String title,
-                                   String author,
-                                   String isbn,
-                                   BigDecimal price,
+public record CreateBookRequestDto(@NotBlank String title,
+                                   @NotBlank String author,
+                                   @NotBlank String isbn,
+                                   @NotNull @Positive BigDecimal price,
                                    String description,
                                    String coverImage) {
 }
diff --git a/src/main/java/com/example/springbootbookshop/exception/CustomGlobalExceptionHandler.java b/src/main/java/com/example/springbootbookshop/exception/CustomGlobalExceptionHandler.java
new file mode 100644
index 0000000..ee4eaf5
--- /dev/null
+++ b/src/main/java/com/example/springbootbookshop/exception/CustomGlobalExceptionHandler.java
@@ -0,0 +1,48 @@
+package com.example.springbootbookshop.exception;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.HttpStatusCode;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.FieldError;
+import org.springframework.validation.ObjectError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.context.request.WebRequest;
+import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
+
+@ControllerAdvice
+public class CustomGlobalExceptionHandler extends ResponseEntityExceptionHandler {
+    @Override
+    protected ResponseEntity<Object> handleMethodArgumentNotValid(
+            MethodArgumentNotValidException ex,
+            HttpHeaders headers, HttpStatusCode status,
+            WebRequest request) {
+        Map<String,Object> body = new LinkedHashMap<>();
+        List<String> errors = ex.getBindingResult().getAllErrors().stream()
+                .map(this::getErrorMessage)
+                .toList();
+        body.put("errors", errors);
+        return new ResponseEntity<>(body,headers,status);
+    }
+
+    @ExceptionHandler(EntityNotFoundException.class)
+    public ResponseEntity<Object> handleEntityNotFoundException(
+            EntityNotFoundException ex) {
+        System.out.println(ex.getMessage());
+        return new ResponseEntity<>(ex.getLocalizedMessage(), HttpStatus.BAD_REQUEST);
+    }
+
+    private String getErrorMessage(ObjectError e) {
+        if (e instanceof FieldError) {
+            String field = ((FieldError) e).getField();
+            String message = e.getDefaultMessage();
+            return String.format("%s %s",field,message);
+        }
+        return e.getDefaultMessage();
+    }
+}
diff --git a/src/main/java/com/example/springbootbookshop/service/impl/BookServiceImpl.java b/src/main/java/com/example/springbootbookshop/service/impl/BookServiceImpl.java
index d3abaec..b53282e 100644
--- a/src/main/java/com/example/springbootbookshop/service/impl/BookServiceImpl.java
+++ b/src/main/java/com/example/springbootbookshop/service/impl/BookServiceImpl.java
@@ -3,10 +3,10 @@
 import com.example.springbootbookshop.dto.BookDto;
 import com.example.springbootbookshop.dto.CreateBookRequestDto;
 import com.example.springbootbookshop.entity.Book;
+import com.example.springbootbookshop.exception.EntityNotFoundException;
 import com.example.springbootbookshop.mapper.BookMapper;
 import com.example.springbootbookshop.repository.BookRepository;
 import com.example.springbootbookshop.service.BookService;
-import jakarta.persistence.EntityNotFoundException;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Component;