diff --git a/build.gradle b/build.gradle
index 98d7290..4e63530 100644
--- a/build.gradle
+++ b/build.gradle
@@ -31,6 +31,7 @@ dependencies {
 
     // mandatory dependencies for using Spock
     // note: please use same Groovy version as on Jenkins
+    implementation "org.codehaus.groovy:groovy-all:2.4.12"
     implementation "com.cloudbees:groovy-cps:1.31@jar", withoutIcu
     implementation "org.jenkins-ci.main:jenkins-core:2.452", withoutIcu
     implementation "org.jenkins-ci.plugins:badge:1.13@jar"