diff --git a/build.gradle b/build.gradle
index 5a6fd8858a3..8a5e729e57a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -44,14 +44,17 @@ configure(allprojects) { project ->
 	ext.jodaVersion          = "2.4"
 	ext.junitVersion         = "4.11"
 	ext.openJpaVersion       = "2.2.2"  // 2.3.0 not Java 8 compatible (based on ASM 4)
+	ext.protobufVersion      = "2.5.0"
+	ext.reactorVersion       = "1.1.4.RELEASE"
 	ext.slf4jVersion         = "1.7.7"
 	ext.snakeYamlVersion     = "1.13"
 	ext.snifferVersion       = "1.11"
 	ext.tiles2Version        = "2.2.2"
 	ext.tiles3Version        = "3.0.4"
 	ext.tomcatVersion        = "8.0.9"
+	ext.tyrusVersion         = "1.3.5"
+	ext.undertowVersion      = "1.0.16.Final"
 	ext.xstreamVersion       = "1.4.7"
-	ext.protobufVersion      = "2.5.0"
 	ext.woodstoxVersion      = "4.1.6"
 
 	ext.gradleScriptDir = "${rootProject.projectDir}/gradle"
@@ -472,8 +475,8 @@ project("spring-messaging") {
 		compile(project(":spring-beans"))
 		compile(project(":spring-core"))
 		compile(project(":spring-context"))
-		optional("org.projectreactor:reactor-core:1.1.3.RELEASE")
-		optional("org.projectreactor:reactor-net:1.1.3.RELEASE")
+		optional("org.projectreactor:reactor-core:${reactorVersion}")
+		optional("org.projectreactor:reactor-net:${reactorVersion}")
 		optional("org.eclipse.jetty.websocket:websocket-server:${jettyVersion}") {
 			exclude group: "javax.servlet", module: "javax.servlet-api"
 		}
@@ -708,10 +711,10 @@ project("spring-websocket") {
 			exclude group: "org.apache.tomcat", module: "tomcat-websocket-api"
 			exclude group: "org.apache.tomcat", module: "tomcat-servlet-api"
 		}
-		optional("org.glassfish.tyrus:tyrus-spi:1.3.5")
-		optional("org.glassfish.tyrus:tyrus-core:1.3.5")
-		optional("org.glassfish.tyrus:tyrus-server:1.3.5")
-		optional("org.glassfish.tyrus:tyrus-container-servlet:1.3.5")
+		optional("org.glassfish.tyrus:tyrus-spi:${tyrusVersion}")
+		optional("org.glassfish.tyrus:tyrus-core:${tyrusVersion}")
+		optional("org.glassfish.tyrus:tyrus-server:${tyrusVersion}")
+		optional("org.glassfish.tyrus:tyrus-container-servlet:${tyrusVersion}")
 		optional("org.eclipse.jetty:jetty-webapp:${jettyVersion}") {
 			exclude group: "javax.servlet", module: "javax.servlet"
 		}
@@ -720,20 +723,20 @@ project("spring-websocket") {
 		}
 		optional("org.eclipse.jetty.websocket:websocket-client:${jettyVersion}")
 		optional("org.eclipse.jetty:jetty-client:${jettyVersion}")
-		optional("io.undertow:undertow-core:1.0.15.Final")
-		optional("io.undertow:undertow-servlet:1.0.15.Final") {
+		optional("io.undertow:undertow-core:${undertowVersion}")
+		optional("io.undertow:undertow-servlet:${undertowVersion}") {
 			exclude group: "org.jboss.spec.javax.servlet", module: "jboss-servlet-api_3.1_spec"
 			exclude group: "org.jboss.spec.javax.annotation", module: "jboss-annotations-api_1.2_spec"
 		}
-		optional("io.undertow:undertow-websockets-jsr:1.0.15.Final") {
+		optional("io.undertow:undertow-websockets-jsr:${undertowVersion}") {
 			exclude group: "org.jboss.spec.javax.websocket", module: "jboss-websocket-api_1.0_spec"
 		}
 		optional("com.fasterxml.jackson.core:jackson-databind:${jackson2Version}")
 		testCompile("org.apache.tomcat.embed:tomcat-embed-core:${tomcatVersion}")
 		testCompile("org.apache.tomcat.embed:tomcat-embed-websocket:${tomcatVersion}")
 		testCompile("org.apache.tomcat.embed:tomcat-embed-logging-juli:${tomcatVersion}")
-		testCompile("org.projectreactor:reactor-core:1.1.3.RELEASE")
-		testCompile("org.projectreactor:reactor-net:1.1.3.RELEASE")
+		testCompile("org.projectreactor:reactor-core:${reactorVersion}")
+		testCompile("org.projectreactor:reactor-net:${reactorVersion}")
 		testCompile("log4j:log4j:1.2.17")
 		testCompile("org.slf4j:slf4j-jcl:${slf4jVersion}")
 	}