diff --git a/Lesson4/pom.xml b/Lesson4/pom.xml
index fcb1755..9f703fa 100644
--- a/Lesson4/pom.xml
+++ b/Lesson4/pom.xml
@@ -20,7 +20,7 @@
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<jetty9-version>9.4.28.v20200408</jetty9-version>
-		<logback-version>1.2.0</logback-version>
+		<logback-version>1.2.13</logback-version>
 		<atmosphere-version>2.7.0</atmosphere-version>
 		<jackson-version>2.12.7.1</jackson-version>
 	</properties>