diff --git a/symmetric-assemble/build.gradle b/symmetric-assemble/build.gradle
index 1486e1d9a7..a91dd9841f 100644
--- a/symmetric-assemble/build.gradle
+++ b/symmetric-assemble/build.gradle
@@ -6,13 +6,21 @@ buildscript {
 
     dependencies {
         classpath 'org.asciidoctor:asciidoctor-gradle-plugin:1.5.2'
-        classpath 'org.asciidoctor:asciidoctorj-pdf:1.5.0-alpha.10'
+        classpath 'org.asciidoctor:asciidoctorj-pdf:1.5.0-alpha.6'
         classpath 'org.springframework.build.gradle:propdeps-plugin:0.0.7'
         classpath 'io.spring.gradle:docbook-reference-plugin:0.3.0'
-        classpath "com.smokejumperit.gradle.license:Gradle-License-Report:0.0.2"
+        classpath ("com.smokejumperit.gradle.license:Gradle-License-Report:0.0.2") {
+            // guava 21 requires Java 8, setting up for a clean build with only Java 1.7 tools.
+            exclude group: 'com.google.guava', module: 'guava'
+        }
+        classpath 'com.google.guava:guava:20.0'
     }
 }
 
+task buildScriptDependencies(type: org.gradle.api.tasks.diagnostics.DependencyReportTask) {
+    configurations = project.buildscript.configurations
+}
+
 project.buildDir='target'
 apply from: symAssembleDir + '/common.gradle'