diff --git a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailExistsException.java b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailExistsException.java
index af029cf..6f90404 100644
--- a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailExistsException.java
+++ b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailExistsException.java
@@ -1,6 +1,6 @@
 package net.shyshkin.study.fullstack.supportportal.backend.exception.domain;
 
-public class EmailExistsException extends Exception{
+public class EmailExistsException extends RuntimeException {
     public EmailExistsException(String message) {
         super(message);
     }
diff --git a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailNotFoundException.java b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailNotFoundException.java
index e11d824..28fd36b 100644
--- a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailNotFoundException.java
+++ b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailNotFoundException.java
@@ -1,6 +1,6 @@
 package net.shyshkin.study.fullstack.supportportal.backend.exception.domain;
 
-public class EmailNotFoundException extends Exception{
+public class EmailNotFoundException extends RuntimeException {
     public EmailNotFoundException(String message) {
         super(message);
     }
diff --git a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UserNotFoundException.java b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UserNotFoundException.java
index 1ee6c81..22c5096 100644
--- a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UserNotFoundException.java
+++ b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UserNotFoundException.java
@@ -1,6 +1,6 @@
 package net.shyshkin.study.fullstack.supportportal.backend.exception.domain;
 
-public class UserNotFoundException extends Exception{
+public class UserNotFoundException extends RuntimeException {
     public UserNotFoundException(String message) {
         super(message);
     }
diff --git a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UsernameExistsException.java b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UsernameExistsException.java
index bc34262..4f3d430 100644
--- a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UsernameExistsException.java
+++ b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UsernameExistsException.java
@@ -1,6 +1,6 @@
 package net.shyshkin.study.fullstack.supportportal.backend.exception.domain;
 
-public class UsernameExistsException extends Exception{
+public class UsernameExistsException extends RuntimeException {
     public UsernameExistsException(String message) {
         super(message);
     }