diff --git a/build.gradle.kts b/build.gradle.kts
index d3b5586c..d9daa3f5 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -17,7 +17,7 @@ val dependencyVersions = listOf(
   "org.apache.groovy:groovy:4.0.24",
   "org.apache.groovy:groovy-json:4.0.24",
   "org.jetbrains:annotations:26.1.0",
-  "org.junit:junit-bom:5.13.4",
+  "org.junit:junit-bom:6.0.3",
 )
 
 val dependencyVersionsByGroup = mapOf<String, String>()
diff --git a/client-groovy4/build.gradle.kts b/client-groovy4/build.gradle.kts
index c3143d13..a227c592 100644
--- a/client-groovy4/build.gradle.kts
+++ b/client-groovy4/build.gradle.kts
@@ -98,7 +98,7 @@ dependencies {
 
   testImplementation("de.gesellix:testutil:[2026-01-01T01-01-01,)")
 
-  testImplementation("org.junit.platform:junit-platform-launcher:1.13.4")
+  testImplementation("org.junit.platform:junit-platform-launcher:6.0.3")
   testImplementation("org.spockframework:spock-core:2.3-groovy-4.0")
   testRuntimeOnly("net.bytebuddy:byte-buddy:1.18.7")
   testRuntimeOnly("org.objenesis:objenesis:3.5")
diff --git a/client/build.gradle.kts b/client/build.gradle.kts
index 22de74d2..2ce911bd 100644
--- a/client/build.gradle.kts
+++ b/client/build.gradle.kts
@@ -98,7 +98,7 @@ dependencies {
 
   testImplementation("de.gesellix:testutil:[2026-01-01T01-01-01,)")
 
-  testImplementation("org.junit.platform:junit-platform-launcher:1.13.4")
+  testImplementation("org.junit.platform:junit-platform-launcher:6.0.3")
   testImplementation("org.spockframework:spock-core:2.3-groovy-3.0")
   testRuntimeOnly("net.bytebuddy:byte-buddy:1.18.7")
   testRuntimeOnly("org.objenesis:objenesis:3.5")
diff --git a/explore/build.gradle.kts b/explore/build.gradle.kts
index 9b7bfdc4..e45844f4 100644
--- a/explore/build.gradle.kts
+++ b/explore/build.gradle.kts
@@ -67,7 +67,7 @@ dependencies {
   runtimeOnly("ch.qos.logback:logback-classic:${libs.versions.logbackVersionrange.get()}!!${libs.versions.logback.get()}")
 
   testImplementation("org.spockframework:spock-core:2.3-groovy-4.0")
-  testRuntimeOnly("org.junit.platform:junit-platform-launcher:1.13.4")
+  testRuntimeOnly("org.junit.platform:junit-platform-launcher:6.0.3")
   testRuntimeOnly("net.bytebuddy:byte-buddy:1.18.7")
   testRuntimeOnly("ch.qos.logback:logback-classic:${libs.versions.logbackVersionrange.get()}!!${libs.versions.logback.get()}")
 }
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index b5126711..58b1f9b3 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -3,8 +3,8 @@ groovy3 = "3.0.23"
 groovy3Versionrange = "[3,4)"
 groovy4 = "4.0.24"
 groovy4Versionrange = "[4,5)"
-junitJupiter = "5.13.4"
-junitPlatform = "1.13.4"
+junitJupiter = "6.0.3"
+junitPlatform = "6.0.3"
 kotlin = "2.3.10"
 kotlinVersionrange = "[1.6,3)"
 logback = "1.3.16"
diff --git a/integration-test/build.gradle.kts b/integration-test/build.gradle.kts
index bf7242d1..453bc9b9 100644
--- a/integration-test/build.gradle.kts
+++ b/integration-test/build.gradle.kts
@@ -74,7 +74,7 @@ dependencies {
   testImplementation("de.gesellix:docker-registry:2026-03-08T22-45-00")
   testImplementation("de.gesellix:testutil:[2026-01-01T01-01-01,)")
   testImplementation("org.spockframework:spock-core:2.3-groovy-4.0")
-  testRuntimeOnly("org.junit.platform:junit-platform-launcher:1.13.4")
+  testRuntimeOnly("org.junit.platform:junit-platform-launcher:6.0.3")
   testRuntimeOnly("net.bytebuddy:byte-buddy:1.18.7")
   testImplementation("org.apache.commons:commons-lang3:3.20.0")
   testRuntimeOnly("ch.qos.logback:logback-classic:${libs.versions.logbackVersionrange.get()}!!${libs.versions.logback.get()}")