diff --git a/samples/junit5/build.gradle b/samples/junit5/build.gradle
index a9bac880..b94de89a 100644
--- a/samples/junit5/build.gradle
+++ b/samples/junit5/build.gradle
@@ -3,7 +3,7 @@ buildscript {
 		mavenCentral()
 	}
 	dependencies {
-		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.0.0.RELEASE'
+		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.1.3.RELEASE'
 		classpath 'org.junit.platform:junit-platform-gradle-plugin:1.0.1'
 	}
 }
@@ -31,13 +31,12 @@ targetCompatibility = 1.8
 
 ext {
 	snippetsDir = file('build/generated-snippets')
-	junitJupiterVersion = '5.0.0'
 }
 
 ext['spring-restdocs.version'] = '2.0.4.BUILD-SNAPSHOT'
 
 dependencies {
-	asciidoctor "org.springframework.restdocs:spring-restdocs-asciidoctor:${project.ext['spring-restdocs.version']}"
+	asciidoctor 'org.springframework.restdocs:spring-restdocs-asciidoctor'
 
 	compile 'org.springframework.boot:spring-boot-starter-web'
 
@@ -45,8 +44,8 @@ dependencies {
 		exclude group: 'junit', module: 'junit;'
 	}
 	testCompile 'org.springframework.restdocs:spring-restdocs-mockmvc'
-	testCompile "org.junit.jupiter:junit-jupiter-api:${junitJupiterVersion}"
-	testRuntime "org.junit.jupiter:junit-jupiter-engine:${junitJupiterVersion}"
+	testCompile 'org.junit.jupiter:junit-jupiter-api'
+	testRuntime 'org.junit.jupiter:junit-jupiter-engine'
 }
 
 test {
diff --git a/samples/rest-assured/build.gradle b/samples/rest-assured/build.gradle
index d70b3c9c..20cfec7a 100644
--- a/samples/rest-assured/build.gradle
+++ b/samples/rest-assured/build.gradle
@@ -3,7 +3,7 @@ buildscript {
 		mavenCentral()
 	}
 	dependencies {
-		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.0.0.RELEASE'
+		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.1.3.RELEASE'
 	}
 }
 
@@ -34,11 +34,11 @@ ext {
 ext['spring-restdocs.version'] = '2.0.4.BUILD-SNAPSHOT'
 
 dependencies {
+	asciidoctor 'org.springframework.restdocs:spring-restdocs-asciidoctor'
 	compile 'org.springframework.boot:spring-boot-starter-web'
 	testCompile 'io.rest-assured:rest-assured:3.0.2'
 	testCompile 'org.springframework.boot:spring-boot-starter-test'
 	testCompile 'org.springframework.restdocs:spring-restdocs-restassured'
-	asciidoctor "org.springframework.restdocs:spring-restdocs-asciidoctor:${project.ext['spring-restdocs.version']}"
 }
 
 test {
diff --git a/samples/rest-notes-slate/build.gradle b/samples/rest-notes-slate/build.gradle
index e4a2bd3e..f23a622e 100644
--- a/samples/rest-notes-slate/build.gradle
+++ b/samples/rest-notes-slate/build.gradle
@@ -3,7 +3,7 @@ buildscript {
 		mavenCentral()
 	}
 	dependencies {
-		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.0.0.RELEASE'
+		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.1.3.RELEASE'
 	}
 }
 
diff --git a/samples/rest-notes-spring-data-rest/pom.xml b/samples/rest-notes-spring-data-rest/pom.xml
index cf8faace..0016c457 100644
--- a/samples/rest-notes-spring-data-rest/pom.xml
+++ b/samples/rest-notes-spring-data-rest/pom.xml
@@ -11,7 +11,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.0.0.RELEASE</version>
+		<version>2.1.3.RELEASE</version>
 		<relativePath />
 	</parent>
 
diff --git a/samples/rest-notes-spring-hateoas/build.gradle b/samples/rest-notes-spring-hateoas/build.gradle
index 131a6c29..d563c6f2 100644
--- a/samples/rest-notes-spring-hateoas/build.gradle
+++ b/samples/rest-notes-spring-hateoas/build.gradle
@@ -3,7 +3,7 @@ buildscript {
 		mavenCentral()
 	}
 	dependencies {
-		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.0.0.RELEASE'
+		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.1.3.RELEASE'
 	}
 }
 
@@ -34,14 +34,11 @@ ext {
 ext['spring-restdocs.version'] = '2.0.4.BUILD-SNAPSHOT'
 
 dependencies {
-	asciidoctor "org.springframework.restdocs:spring-restdocs-asciidoctor:${project.ext['spring-restdocs.version']}"
-
+	asciidoctor 'org.springframework.restdocs:spring-restdocs-asciidoctor'
 	compile 'org.springframework.boot:spring-boot-starter-data-jpa'
 	compile 'org.springframework.boot:spring-boot-starter-hateoas'
-
 	runtime 'com.h2database:h2'
 	runtime 'org.atteo:evo-inflector:1.2.1'
-
 	testCompile 'com.jayway.jsonpath:json-path'
 	testCompile 'org.assertj:assertj-core'
 	testCompile 'org.springframework.boot:spring-boot-starter-test'
diff --git a/samples/testng/build.gradle b/samples/testng/build.gradle
index e8cec0a5..2550b7c3 100644
--- a/samples/testng/build.gradle
+++ b/samples/testng/build.gradle
@@ -3,7 +3,7 @@ buildscript {
 		mavenCentral()
 	}
 	dependencies {
-		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.0.0.RELEASE'
+		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.1.3.RELEASE'
 	}
 }
 
@@ -34,10 +34,8 @@ ext {
 ext['spring-restdocs.version'] = '2.0.4.BUILD-SNAPSHOT'
 
 dependencies {
-	asciidoctor "org.springframework.restdocs:spring-restdocs-asciidoctor:${project.ext['spring-restdocs.version']}"
-
+	asciidoctor 'org.springframework.restdocs:spring-restdocs-asciidoctor'
 	compile 'org.springframework.boot:spring-boot-starter-web'
-
 	testCompile('org.springframework.boot:spring-boot-starter-test') {
 		exclude group: 'junit', module: 'junit;'
 	}