diff --git a/sources/test/init-scripts/build.gradle b/sources/test/init-scripts/build.gradle
index df393e52..d301c1d3 100644
--- a/sources/test/init-scripts/build.gradle
+++ b/sources/test/init-scripts/build.gradle
@@ -14,7 +14,7 @@ repositories {
 
 dependencies {
     testImplementation gradleTestKit()
-    testImplementation 'org.spockframework:spock-core:2.3-groovy-3.0'
+    testImplementation 'org.spockframework:spock-core:2.3-groovy-4.0'
     testImplementation('org.spockframework:spock-junit4:2.3-groovy-3.0')
 
     testImplementation ('io.ratpack:ratpack-groovy-test:1.9.0') {