diff --git a/build.gradle b/build.gradle
index a693fbc..d4e958f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -44,14 +44,15 @@ configure(allprojects) {
 	apply plugin: "com.jfrog.artifactory"
 
 	ext {
-		springBootVersion = project.findProperty("springBootVersion") ?: "2.0.6.RELEASE"
-		springVersion = project.findProperty("springVersion") ?: "5.0.10.RELEASE"
-		reactorVersion = project.findProperty("reactorVersion") ?: "Bismuth-SR14"
+		springBootVersion = project.findProperty("springBootVersion") ?: "2.1.1.RELEASE"
+		springVersion = project.findProperty("springVersion") ?: "5.1.3.RELEASE"
+		reactorVersion = project.findProperty("reactorVersion") ?: "Californium-SR3"
 		openServiceBrokerVersion = "3.0.0.BUILD-SNAPSHOT"
 		springCredhubVersion = "2.0.0.BUILD-SNAPSHOT"
 		cfJavaClientVersion = "3.13.0.RELEASE"
 		mockitoVersion = "2.23.4"
 		immutablesVersion = "2.7.3"
+		assertjVersion = "3.9.1"
 	}
 
 	//override managed Spring Boot versions
diff --git a/spring-cloud-app-broker-acceptance-tests/build.gradle b/spring-cloud-app-broker-acceptance-tests/build.gradle
index aef2ebf..d4cae01 100644
--- a/spring-cloud-app-broker-acceptance-tests/build.gradle
+++ b/spring-cloud-app-broker-acceptance-tests/build.gradle
@@ -29,7 +29,7 @@ dependencies {
 	testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine")
 
 	testImplementation("org.junit.jupiter:junit-jupiter-api")
-	testImplementation("org.assertj:assertj-core")
+	testImplementation("org.assertj:assertj-core:${assertjVersion}")
 	testImplementation("com.revinate:assertj-json:1.2.0")
 
 	testImplementation("org.springframework.boot:spring-boot-starter-webflux")
diff --git a/spring-cloud-app-broker-core/build.gradle b/spring-cloud-app-broker-core/build.gradle
index 59cbe61..39a6750 100644
--- a/spring-cloud-app-broker-core/build.gradle
+++ b/spring-cloud-app-broker-core/build.gradle
@@ -18,7 +18,6 @@ description = "Spring Cloud App Broker Core"
 
 ext {
 	junitJupiterVersion = "5.1.1"
-	assertjVersion = "3.9.1"
 }
 
 dependencyManagement {