diff --git a/build.gradle b/build.gradle
index 747c9ee1611..3e15a08df60 100644
--- a/build.gradle
+++ b/build.gradle
@@ -46,21 +46,21 @@ configure(allprojects) { project ->
 	ext.groovyVersion        = "2.4.15"
 	ext.hsqldbVersion        = "2.4.0"
 	ext.jackson2Version      = "2.9.5"
-	ext.jettyVersion         = "9.4.9.v20180320"
+	ext.jettyVersion         = "9.4.10.v20180503"
 	ext.junitJupiterVersion  = "5.0.3"
 	ext.junitPlatformVersion = "1.0.3"
 	ext.junitVintageVersion  = "4.12.3"
 	ext.kotlinVersion        = "1.2.41"
 	ext.log4jVersion         = "2.11.0"
 	ext.nettyVersion         = "4.1.24.Final"
-	ext.reactorVersion       = "Bismuth-BUILD-SNAPSHOT"
+	ext.reactorVersion       = "Bismuth-SR9"
 	ext.rxjavaVersion        = "1.3.8"
 	ext.rxjavaAdapterVersion = "1.2.1"
 	ext.rxjava2Version       = "2.1.13"
 	ext.slf4jVersion         = "1.7.25"	  // spring-jcl + consistent 3rd party deps
 	ext.tiles3Version        = "3.0.8"
-	ext.tomcatVersion        = "8.5.30"
-	ext.undertowVersion      = "1.4.24.Final"
+	ext.tomcatVersion        = "8.5.31"
+	ext.undertowVersion      = "1.4.25.Final"
 
 	ext.gradleScriptDir = "${rootProject.projectDir}/gradle"
 
@@ -139,7 +139,6 @@ configure(allprojects) { project ->
 
 	repositories {
 		maven { url "https://repo.spring.io/libs-release" }
-		maven { url "https://repo.spring.io/snapshot" }  // for Reactor
 	}
 
 	dependencies {
diff --git a/spring-web/spring-web.gradle b/spring-web/spring-web.gradle
index 65178923e03..7e687f69b1d 100644
--- a/spring-web/spring-web.gradle
+++ b/spring-web/spring-web.gradle
@@ -60,7 +60,7 @@ dependencies {
 	optional("com.fasterxml.jackson.dataformat:jackson-dataformat-xml:${jackson2Version}")
 	optional("com.fasterxml.jackson.dataformat:jackson-dataformat-smile:${jackson2Version}")
 	optional("com.fasterxml.jackson.dataformat:jackson-dataformat-cbor:${jackson2Version}")
-	optional("com.google.code.gson:gson:2.8.2")
+	optional("com.google.code.gson:gson:2.8.4")
 	optional("com.google.protobuf:protobuf-java-util:3.5.1")
 	optional("com.googlecode.protobuf-java-format:protobuf-java-format:1.4")
 	optional("com.rometools:rome:1.9.0")