diff --git a/build.gradle b/build.gradle
index 0b3d355..fcb4017 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 buildscript {
     ext {
         gaeVersion = '1.9.53'
-        groovyVersion = '2.4.12'
+        groovyVersion = '2.5.13'
     }
     repositories {
         jcenter()