diff --git a/build.gradle b/build.gradle
index c882144..d988e56 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,7 +7,7 @@ buildscript {
             mavenLocal()
             mavenCentral()
         }
-        groovyAllVersion = '2.5.19'
+        groovyAllVersion = '2.5.20'
         lombokVersion = '1.18.24'
         spockVersion = '1.3-groovy-2.5'
         spockReportsVersion = '1.8.0'