diff --git a/build.gradle b/build.gradle
index 34774f7..fa76a40 100644
--- a/build.gradle
+++ b/build.gradle
@@ -18,7 +18,7 @@ dependencies {
     compile 'com.fasterxml.jackson.core:jackson-databind:2.4.2'
 
     testCompile 'com.openpojo:openpojo:0.8.3'
-    testCompile "org.codehaus.groovy:groovy-all:2.3.7"
+    testCompile "org.codehaus.groovy:groovy-all:2.5.8"
     testCompile "org.spockframework:spock-core:1.0-groovy-2.4"
     testRuntime 'org.slf4j:slf4j-simple:1.7.7'
 }