Dependencies upgrade

build.gradle

@@ -3,7 +3,7 @@ buildscript {
 		maven { url 'https://repo.spring.io/plugins-release' }
 	}
 	dependencies {
-		classpath 'io.spring.gradle:dependency-management-plugin:1.0.2.RELEASE'
+		classpath 'io.spring.gradle:dependency-management-plugin:1.0.3.RELEASE'
 		classpath 'io.spring.gradle:spring-io-plugin:0.0.8.RELEASE'
 		classpath 'io.spring.gradle:docbook-reference-plugin:0.3.1'
 		classpath 'org.asciidoctor:asciidoctor-gradle-plugin:1.5.0'
@@ -70,18 +70,18 @@ subprojects { subproject ->
 	}
 
 	ext {
-		assertjVersion = '2.6.0'
+		assertjVersion = '3.9.0'
 		hamcrestVersion = '1.3'
-		jacksonVersion = '2.9.1'
+		jacksonVersion = '2.9.4'
 		jaywayJsonPathVersion = '2.4.0'
 		junitVersion = '4.12'
 		kafkaVersion = '1.0.0'
-		mockitoVersion = '2.11.0'
+		mockitoVersion = '2.15.0'
 		scalaVersion = '2.11'
 		slf4jVersion = '1.7.25'
 		springRetryVersion = '1.2.2.RELEASE'
-		springVersion = '5.0.3.RELEASE'
-		springDataCommonsVersion = '2.0.3.RELEASE'
+		springVersion = '5.0.4.RELEASE'
+		springDataCommonsVersion = '2.0.4.RELEASE'
 
 		idPrefix = 'kafka'
 
@@ -108,7 +108,7 @@ subprojects { subproject ->
 
 	checkstyle {
 		configFile = file("${rootDir}/src/checkstyle/checkstyle.xml")
-		toolVersion = "8.1"
+		toolVersion = "8.8"
 	}
 
 	jacocoTestReport {