diff --git a/build.gradle b/build.gradle
index 4a453590..0c6624d7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,7 +7,7 @@ buildscript {
 	dependencies {
 		classpath 'org.springframework.build.gradle:propdeps-plugin:0.0.7'
 		classpath 'io.spring.gradle:spring-io-plugin:0.0.8.RELEASE'
-		classpath 'org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:2.2.1'
+		classpath 'org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:2.6.2'
 	}
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 7d18717c..18792c68 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 cd1f40f5..ab4553c0 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Thu Mar 23 11:47:38 GMT 2017
+#Wed Aug 01 14:27:17 BST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.4.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-bin.zip
diff --git a/samples/rest-assured/gradle/wrapper/gradle-wrapper.jar b/samples/rest-assured/gradle/wrapper/gradle-wrapper.jar
index 98b249f0..70e26274 100644
Binary files a/samples/rest-assured/gradle/wrapper/gradle-wrapper.jar and b/samples/rest-assured/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/samples/rest-assured/gradle/wrapper/gradle-wrapper.properties b/samples/rest-assured/gradle/wrapper/gradle-wrapper.properties
index fff42c29..1e11c4b7 100644
--- a/samples/rest-assured/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/rest-assured/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Thu Mar 23 11:48:10 GMT 2017
+#Wed Aug 08 09:59:27 BST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.4.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-bin.zip
diff --git a/samples/rest-notes-slate/gradle/wrapper/gradle-wrapper.jar b/samples/rest-notes-slate/gradle/wrapper/gradle-wrapper.jar
index e2bce308..94fe1b06 100644
Binary files a/samples/rest-notes-slate/gradle/wrapper/gradle-wrapper.jar and b/samples/rest-notes-slate/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/samples/rest-notes-slate/gradle/wrapper/gradle-wrapper.properties b/samples/rest-notes-slate/gradle/wrapper/gradle-wrapper.properties
index a4567bcf..861b71aa 100644
--- a/samples/rest-notes-slate/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/rest-notes-slate/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Thu Mar 23 11:51:47 GMT 2017
+#Wed Aug 08 10:00:04 BST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.4.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-bin.zip
diff --git a/samples/rest-notes-spring-hateoas/gradle/wrapper/gradle-wrapper.jar b/samples/rest-notes-spring-hateoas/gradle/wrapper/gradle-wrapper.jar
index 2ccb7c45..383baf1e 100644
Binary files a/samples/rest-notes-spring-hateoas/gradle/wrapper/gradle-wrapper.jar and b/samples/rest-notes-spring-hateoas/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/samples/rest-notes-spring-hateoas/gradle/wrapper/gradle-wrapper.properties b/samples/rest-notes-spring-hateoas/gradle/wrapper/gradle-wrapper.properties
index 785a1992..e3f31fa4 100644
--- a/samples/rest-notes-spring-hateoas/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/rest-notes-spring-hateoas/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Thu Mar 23 11:52:07 GMT 2017
+#Wed Aug 08 10:00:26 BST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.4.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-bin.zip
diff --git a/samples/testng/gradle/wrapper/gradle-wrapper.jar b/samples/testng/gradle/wrapper/gradle-wrapper.jar
index afc752b6..0a070c33 100644
Binary files a/samples/testng/gradle/wrapper/gradle-wrapper.jar and b/samples/testng/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/samples/testng/gradle/wrapper/gradle-wrapper.properties b/samples/testng/gradle/wrapper/gradle-wrapper.properties
index 816de9ef..6f07d35b 100644
--- a/samples/testng/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/testng/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Thu Mar 23 11:52:19 GMT 2017
+#Wed Aug 08 10:00:39 BST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.4.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-bin.zip