diff --git a/examples/spring-mail-integration-demo/pom.xml b/examples/spring-mail-integration-demo/pom.xml
index aabb04bf..16b81968 100644
--- a/examples/spring-mail-integration-demo/pom.xml
+++ b/examples/spring-mail-integration-demo/pom.xml
@@ -6,7 +6,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.5.2</version>
+		<version>2.5.5</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 
diff --git a/examples/spring-mail-integration-demo/src/main/java/ru/otus/example/springmail_integration_demo/integration/IntegrationConfig.java b/examples/spring-mail-integration-demo/src/main/java/ru/otus/example/springmail_integration_demo/integration/IntegrationConfig.java
index f039a8c8..99f87031 100644
--- a/examples/spring-mail-integration-demo/src/main/java/ru/otus/example/springmail_integration_demo/integration/IntegrationConfig.java
+++ b/examples/spring-mail-integration-demo/src/main/java/ru/otus/example/springmail_integration_demo/integration/IntegrationConfig.java
@@ -9,6 +9,7 @@ import org.springframework.integration.dsl.IntegrationFlowDefinition;
 import org.springframework.integration.dsl.MessageChannels;
 import org.springframework.integration.dsl.Pollers;
 import org.springframework.integration.scheduling.PollerMetadata;
+import org.springframework.mail.SimpleMailMessage;
 import org.springframework.mail.javamail.JavaMailSender;
 import org.springframework.messaging.Message;
 import org.springframework.messaging.PollableChannel;
@@ -16,6 +17,8 @@ import ru.otus.example.springmail_integration_demo.repositories.ActivityReposito
 import ru.otus.example.springmail_integration_demo.repositories.ActivityStatRepository;
 import ru.otus.example.springmail_integration_demo.services.UserActivityToEmailTransformer;
 
+import java.util.concurrent.atomic.AtomicBoolean;
+
 
 @Configuration
 @IntegrationComponentScan
@@ -42,6 +45,8 @@ public class IntegrationConfig {
     @Autowired
     private JavaMailSender mailSender;
 
+    private AtomicBoolean messageWasSandedOnceFlag = new AtomicBoolean(false);
+
     @Bean
     public PollableChannel appUserActivityInChanel() {
         return MessageChannels.queue("appUserActivityInChanel", DEFAULT_QUEUE_CAPACITY).get();
@@ -66,7 +71,12 @@ public class IntegrationConfig {
                                 .transform(messageTransformer, TRANSFORM_METHOD_NAME)
                                 .handle(m -> {
                                     System.out.println("Как будто посылаем письмо: " + m.getPayload());
-                                    //mailSender.send((SimpleMailMessage) m.getPayload());
+/*
+                                    if (!messageWasSandedOnceFlag.get()) {
+                                        mailSender.send((SimpleMailMessage) m.getPayload());
+                                        messageWasSandedOnceFlag.set(true);
+                                    }
+*/
                                 })
                         )
                         .subFlowMapping(false, IntegrationFlowDefinition::nullChannel)
diff --git a/examples/spring-mail-rabbitmq-demo/user-activity-emitter-microservice/pom.xml b/examples/spring-mail-rabbitmq-demo/user-activity-emitter-microservice/pom.xml
index 5c832513..ac61d2b3 100644
--- a/examples/spring-mail-rabbitmq-demo/user-activity-emitter-microservice/pom.xml
+++ b/examples/spring-mail-rabbitmq-demo/user-activity-emitter-microservice/pom.xml
@@ -6,7 +6,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.5.2</version>
+		<version>2.5.5</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 
diff --git a/examples/spring-mail-rabbitmq-demo/user-activity-models/pom.xml b/examples/spring-mail-rabbitmq-demo/user-activity-models/pom.xml
index 125b378f..9dee29bd 100644
--- a/examples/spring-mail-rabbitmq-demo/user-activity-models/pom.xml
+++ b/examples/spring-mail-rabbitmq-demo/user-activity-models/pom.xml
@@ -19,7 +19,7 @@
 		<dependency>
 			<groupId>com.fasterxml.jackson.core</groupId>
 			<artifactId>jackson-annotations</artifactId>
-			<version>2.10.1</version>
+			<version>2.13.0</version>
 		</dependency>
 
 		<dependency>
@@ -32,7 +32,7 @@
 		<dependency>
 			<groupId>org.projectlombok</groupId>
 			<artifactId>lombok</artifactId>
-			<version>1.18.20</version>
+			<version>1.18.22</version>
 			<optional>true</optional>
 		</dependency>
 	</dependencies>
diff --git a/examples/spring-mail-rabbitmq-demo/user-activity-processor-microservice/pom.xml b/examples/spring-mail-rabbitmq-demo/user-activity-processor-microservice/pom.xml
index bcedb2e1..7115ddc6 100644
--- a/examples/spring-mail-rabbitmq-demo/user-activity-processor-microservice/pom.xml
+++ b/examples/spring-mail-rabbitmq-demo/user-activity-processor-microservice/pom.xml
@@ -6,7 +6,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.5.2</version>
+		<version>2.5.5</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>