diff --git a/build.gradle.kts b/build.gradle.kts
index 4a2e158..7f2eec3 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -20,7 +20,7 @@ dependencies {
   testImplementation("org.junit.jupiter:junit-jupiter-api:5.11.4")
   testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.11.4")
 
-  testImplementation("org.spockframework:spock-core:2.4-M5-groovy-4.0")
+  testImplementation("org.spockframework:spock-core:2.4-M6-groovy-4.0")
 
   javacc("net.java.dev.javacc:javacc:7.0.13")
 }