diff --git a/build.gradle.kts b/build.gradle.kts
index cd4d57e..5750d09 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -38,7 +38,7 @@ testing {
 
       dependencies {
         implementation("nl.jqno.equalsverifier:equalsverifier:3.19.3")
-        implementation("org.spockframework:spock-core:2.4-M5-groovy-4.0")
+        implementation("org.spockframework:spock-core:2.4-M6-groovy-4.0")
       }
     }