Merge pull request #347 from imasahiro/dep

Dependency updates

Author: Junpei Koyama

build.gradle

@@ -26,13 +26,13 @@ buildscript {
     }
     dependencies {
         classpath 'com.github.ben-manes:gradle-versions-plugin:0.21.0'
-        classpath 'com.puppycrawl.tools:checkstyle:8.20'
+        classpath 'com.puppycrawl.tools:checkstyle:8.21'
         classpath 'gradle.plugin.com.github.spotbugs:spotbugs-gradle-plugin:2.0.0'
         classpath 'gradle.plugin.com.gorylenko.gradle-git-properties:gradle-git-properties:2.0.0'
-        classpath 'io.franzbecker:gradle-lombok:3.0.0'
-        classpath 'io.spring.gradle:dependency-management-plugin:1.0.7.RELEASE'
+        classpath 'io.franzbecker:gradle-lombok:3.1.0'
+        classpath 'io.spring.gradle:dependency-management-plugin:1.0.8.RELEASE'
         classpath 'io.spring.gradle:propdeps-plugin:0.0.10.RELEASE'
-        classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.1.3.RELEASE'
+        classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.1.5.RELEASE'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
@@ -88,9 +88,9 @@ subprojects {
     group = rootProject.group
     version = rootProject.version
 
-    ext['guava.version'] = '27.1-jre'
+    ext['guava.version'] = '28.0-jre'
     ext['okhttp3.version'] = '3.14.2'
-    ext['retrofit.version'] = '2.5.0'
+    ext['retrofit.version'] = '2.6.0'
 
     dependencyManagement {
         if (project.name != 'test-boot1-compatibility') {
@@ -200,7 +200,7 @@ subprojects {
 
     checkstyle {
         configProperties = [projectDir: rootProject.projectDir]
-        toolVersion = '8.20'
+        toolVersion = '8.21'
     }
 
     spotbugs {