diff --git a/build.gradle b/build.gradle
index 3c8825e..e752fec 100644
--- a/build.gradle
+++ b/build.gradle
@@ -18,8 +18,6 @@ printf "Host: %s\nOS: %s %s %s\nJVM: %s %s %s %s\nGroovy: %s\nGradle: %s\n" +
         GroovySystem.getVersion(),
         gradle.gradleVersion
 
-apply plugin: "io.codearte.nexus-staging"
-
 subprojects {
 
     apply plugin: 'java'
@@ -47,6 +45,12 @@ subprojects {
         wagon "org.apache.maven.wagon:wagon-ssh:${project.property('wagon.version')}"
     }
 
+    checkstyle {
+        configFile = rootProject.file('config/checkstyle/checkstyle.xml')
+        ignoreFailures = true
+        showViolations = true
+    }
+
     sourceCompatibility = JavaVersion.VERSION_1_8
     targetCompatibility = JavaVersion.VERSION_1_8
 
diff --git a/gradle.properties b/gradle.properties
index fe8c09a..140eabc 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -5,4 +5,4 @@ version = 1.1.0
 junit.version = 4.12
 asciidoclet.version = 1.5.4
 wagon.version = 3.0.0
-jackson.version = 2.8.10
+jackson.version = 2.8.11
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 8252d7e..758de96 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 49abb1f..f3e3b2f 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Tue Feb 27 11:11:33 CET 2018
+#Mon Jul 09 22:07:01 CEST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-rc-1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.8.1-all.zip