diff --git a/build.gradle b/build.gradle
index 0b3d355..5a568a4 100644
--- a/build.gradle
+++ b/build.gradle
@@ -47,7 +47,7 @@ dependencies {
     compile 'opensymphony:sitemesh:2.4.2'
 
     compile 'io.jsonwebtoken:jjwt:0.7.0'
-    compile 'io.reactivex.rxjava2:rxjava:2.1.3'
+    compile 'io.reactivex.rxjava2:rxjava:2.2.21'
 
     testCompile 'org.gaelyk:gaelyk-spock:0.5'
     testCompile "com.google.appengine:appengine-api-stubs:$gaeVersion",