diff --git a/client-groovy4/build.gradle.kts b/client-groovy4/build.gradle.kts
index 37817063..d360f50e 100644
--- a/client-groovy4/build.gradle.kts
+++ b/client-groovy4/build.gradle.kts
@@ -104,7 +104,7 @@ dependencies {
   testImplementation("de.gesellix:testutil:[2025-01-01T01-01-01,)")
 
   testImplementation("org.junit.platform:junit-platform-launcher:1.13.4")
-  testImplementation("org.spockframework:spock-core:2.3-groovy-4.0")
+  testImplementation("org.spockframework:spock-core:2.4-groovy-3.0")
   testRuntimeOnly("net.bytebuddy:byte-buddy:1.18.4")
   testRuntimeOnly("org.objenesis:objenesis:3.5")
   testImplementation("io.github.joke:spock-mockable:2.3.0")
diff --git a/client/build.gradle.kts b/client/build.gradle.kts
index f5a9ed08..5b175e05 100644
--- a/client/build.gradle.kts
+++ b/client/build.gradle.kts
@@ -104,7 +104,7 @@ dependencies {
   testImplementation("de.gesellix:testutil:[2025-01-01T01-01-01,)")
 
   testImplementation("org.junit.platform:junit-platform-launcher:1.13.4")
-  testImplementation("org.spockframework:spock-core:2.3-groovy-3.0")
+  testImplementation("org.spockframework:spock-core:2.4-groovy-3.0")
   testRuntimeOnly("net.bytebuddy:byte-buddy:1.18.4")
   testRuntimeOnly("org.objenesis:objenesis:3.5")
   testImplementation("io.github.joke:spock-mockable:2.3.0")
diff --git a/explore/build.gradle.kts b/explore/build.gradle.kts
index 30f38fbe..6ef829c8 100644
--- a/explore/build.gradle.kts
+++ b/explore/build.gradle.kts
@@ -66,7 +66,7 @@ dependencies {
   implementation(libs.slf4j)
   runtimeOnly("ch.qos.logback:logback-classic:${libs.versions.logbackVersionrange.get()}!!${libs.versions.logback.get()}")
 
-  testImplementation("org.spockframework:spock-core:2.3-groovy-4.0")
+  testImplementation("org.spockframework:spock-core:2.4-groovy-3.0")
   testRuntimeOnly("org.junit.platform:junit-platform-launcher:1.13.4")
   testRuntimeOnly("net.bytebuddy:byte-buddy:1.18.4")
   testRuntimeOnly("ch.qos.logback:logback-classic:${libs.versions.logbackVersionrange.get()}!!${libs.versions.logback.get()}")
diff --git a/integration-test/build.gradle.kts b/integration-test/build.gradle.kts
index 4b3604e4..3840d27e 100644
--- a/integration-test/build.gradle.kts
+++ b/integration-test/build.gradle.kts
@@ -78,7 +78,7 @@ dependencies {
 
   testImplementation("de.gesellix:docker-registry:2025-11-30T21-04-00")
   testImplementation("de.gesellix:testutil:[2025-01-01T01-01-01,)")
-  testImplementation("org.spockframework:spock-core:2.3-groovy-4.0")
+  testImplementation("org.spockframework:spock-core:2.4-groovy-3.0")
   testRuntimeOnly("org.junit.platform:junit-platform-launcher:1.13.4")
   testRuntimeOnly("net.bytebuddy:byte-buddy:1.18.4")
   testImplementation("org.apache.commons:commons-lang3:3.20.0")