diff --git a/samples/junit5/build.gradle b/samples/junit5/build.gradle
index 872ae25c..7a9ec265 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:2.1.8.RELEASE'
+		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.1.9.RELEASE'
 	}
 }
 
diff --git a/samples/rest-assured/build.gradle b/samples/rest-assured/build.gradle
index f3da3e12..1c16a474 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:2.1.8.RELEASE'
+		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.1.9.RELEASE'
 	}
 }
 
diff --git a/samples/rest-notes-spring-data-rest/pom.xml b/samples/rest-notes-spring-data-rest/pom.xml
index 1fe266b2..6e60976a 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>2.1.8.RELEASE</version>
+		<version>2.1.9.RELEASE</version>
 		<relativePath />
 	</parent>
 
diff --git a/samples/rest-notes-spring-hateoas/build.gradle b/samples/rest-notes-spring-hateoas/build.gradle
index b9df631d..def0731c 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:2.1.8.RELEASE'
+		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.1.9.RELEASE'
 	}
 }
 
diff --git a/samples/testng/build.gradle b/samples/testng/build.gradle
index dad542e2..ab514e41 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:2.1.8.RELEASE'
+		classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.1.9.RELEASE'
 	}
 }