diff --git a/client/build.gradle.kts b/client/build.gradle.kts
index dd149ced..49165b6d 100644
--- a/client/build.gradle.kts
+++ b/client/build.gradle.kts
@@ -123,7 +123,7 @@ dependencies {
   testImplementation("de.gesellix:testutil:[2023-07-01T01-01-01,)")
 
   testImplementation("org.junit.platform:junit-platform-launcher:1.10.0")
-  testImplementation("org.spockframework:spock-core:2.3-groovy-3.0")
+  testImplementation("org.spockframework:spock-core:2.3-groovy-4.0")
   testRuntimeOnly("net.bytebuddy:byte-buddy:1.14.8")
   testRuntimeOnly("org.objenesis:objenesis:3.3")
   testImplementation("io.github.joke:spock-mockable:2.3.0")
diff --git a/explore/build.gradle.kts b/explore/build.gradle.kts
index 824c5362..c6a24800 100644
--- a/explore/build.gradle.kts
+++ b/explore/build.gradle.kts
@@ -56,7 +56,7 @@ dependencies {
   implementation("org.slf4j:slf4j-api:2.0.9")
   runtimeOnly("ch.qos.logback:logback-classic:[1.2,2)!!1.3.8")
 
-  testImplementation("org.spockframework:spock-core:2.3-groovy-3.0")
+  testImplementation("org.spockframework:spock-core:2.3-groovy-4.0")
   testRuntimeOnly("net.bytebuddy:byte-buddy:1.14.8")
   testRuntimeOnly("ch.qos.logback:logback-classic:[1.2,2)!!1.3.8")
 }
diff --git a/integration-test/build.gradle.kts b/integration-test/build.gradle.kts
index 4813a656..e8db3ebd 100644
--- a/integration-test/build.gradle.kts
+++ b/integration-test/build.gradle.kts
@@ -87,7 +87,7 @@ dependencies {
 
   testImplementation("de.gesellix:docker-registry:2023-08-15T22-14-00")
   testImplementation("de.gesellix:testutil:[2023-07-01T01-01-01,)")
-  testImplementation("org.spockframework:spock-core:2.3-groovy-3.0")
+  testImplementation("org.spockframework:spock-core:2.3-groovy-4.0")
   testRuntimeOnly("net.bytebuddy:byte-buddy:1.14.8")
   testImplementation("org.apache.commons:commons-lang3:3.13.0")
   testRuntimeOnly("ch.qos.logback:logback-classic:[1.2,2)!!1.3.8")