diff --git a/src/main/java/ru/ulstu/conference/repository/ConferenceRepository.java b/src/main/java/ru/ulstu/conference/repository/ConferenceRepository.java
index cb8a488..25a481c 100644
--- a/src/main/java/ru/ulstu/conference/repository/ConferenceRepository.java
+++ b/src/main/java/ru/ulstu/conference/repository/ConferenceRepository.java
@@ -1,6 +1,7 @@
 package ru.ulstu.conference.repository;
 
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 import ru.ulstu.conference.model.Conference;
@@ -16,4 +17,8 @@ public interface ConferenceRepository extends JpaRepository<Conference, Integer>
 
     @Query("SELECT c FROM Conference c WHERE c.beginDate > :date")
     List<Conference> findAllActive(@Param("date") Date date);
+
+    @Modifying
+    @Query("UPDATE Conference c SET c.ping = (c.ping + 1) WHERE c.id = :id")
+    int updatePingConference(@Param("id") Integer id);
 }
diff --git a/src/main/java/ru/ulstu/conference/service/ConferenceService.java b/src/main/java/ru/ulstu/conference/service/ConferenceService.java
index 0287e31..370d7d6 100644
--- a/src/main/java/ru/ulstu/conference/service/ConferenceService.java
+++ b/src/main/java/ru/ulstu/conference/service/ConferenceService.java
@@ -146,7 +146,6 @@ public class ConferenceService {
         conference.setTitle(conferenceDto.getTitle());
         conference.setDescription(conferenceDto.getDescription());
         conference.setUrl(conferenceDto.getUrl());
-        Integer pingCount = conferenceDto.getPing() - conference.getPing(); // for notification
         conference.setPing(conference.getPing());
         conference.setBeginDate(conferenceDto.getBeginDate());
         conference.setEndDate(conferenceDto.getEndDate());
@@ -180,9 +179,10 @@ public class ConferenceService {
         return conferenceRepository.findAllActive(new Date());
     }
 
+    @Transactional
     public void ping(ConferenceDto conferenceDto) throws IOException {
         pingService.addPing(findOne(conferenceDto.getId()));
-//        conferenceDto.setPing(conferenceDto.getPing() + 1);
+        conferenceRepository.updatePingConference(conferenceDto.getId());
     }
 
     public Conference findOne(Integer conferenceId) {
diff --git a/src/main/java/ru/ulstu/ping/model/Ping.java b/src/main/java/ru/ulstu/ping/model/Ping.java
index 5ab0860..c7e4c5e 100644
--- a/src/main/java/ru/ulstu/ping/model/Ping.java
+++ b/src/main/java/ru/ulstu/ping/model/Ping.java
@@ -1,7 +1,6 @@
 package ru.ulstu.ping.model;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
-import com.sun.istack.internal.Nullable;
 import org.springframework.format.annotation.DateTimeFormat;
 import ru.ulstu.conference.model.Conference;
 import ru.ulstu.core.model.BaseEntity;
@@ -26,7 +25,6 @@ public class Ping extends BaseEntity {
     @JoinColumn(name = "users_id")
     private User user;
 
-    @Nullable
     @ManyToOne(optional = false)
     @JoinColumn(name = "conference_id")
     private Conference conference;