diff --git a/gradle/subprojects.gradle b/gradle/subprojects.gradle
index 93e89ad0..cc5ebba5 100644
--- a/gradle/subprojects.gradle
+++ b/gradle/subprojects.gradle
@@ -64,7 +64,7 @@ project(':collections') {
 configure(subprojects - project(':onjava')) {
     dependencies {
         compile project(':onjava')
-        compile 'com.google.guava:guava:19.0'
+        compile 'com.google.guava:guava:21.0-rc2'
         compileOnly "org.openjdk.jmh:jmh-core:${jmh.jmhVersion}"
     }
 }