diff --git a/cli/build.gradle.kts b/cli/build.gradle.kts
index aede7202..ecdbb6a3 100644
--- a/cli/build.gradle.kts
+++ b/cli/build.gradle.kts
@@ -16,7 +16,7 @@ dependencies {
     runtimeOnly(project(":opa-builtins"))
     runtimeOnly(project(":opa-jackson"))
 
-    testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:6.1.0")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher:1.10.1")
     testImplementation("org.assertj:assertj-core:3.27.7")
 }
diff --git a/opa-evaluator/build.gradle.kts b/opa-evaluator/build.gradle.kts
index acde34de..2805e355 100644
--- a/opa-evaluator/build.gradle.kts
+++ b/opa-evaluator/build.gradle.kts
@@ -14,7 +14,7 @@ dependencies {
     // for testing.
     testImplementation(project(":opa-jackson"))
     testImplementation("com.fasterxml.jackson.core:jackson-databind:2.21.3")
-    testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:6.1.0")
     testImplementation("org.junit.jupiter:junit-jupiter-params:5.8.2")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher:1.10.1")
     testImplementation("org.json:json:20260522")
diff --git a/opa-gson/build.gradle.kts b/opa-gson/build.gradle.kts
index e6cf6544..197d966c 100644
--- a/opa-gson/build.gradle.kts
+++ b/opa-gson/build.gradle.kts
@@ -10,7 +10,7 @@ dependencies {
     api(project(":opa-evaluator"))
     implementation("com.google.code.gson:gson:2.11.0")
 
-    testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:6.1.0")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher:1.10.1")
     testImplementation("org.assertj:assertj-core:3.27.7")
 }
diff --git a/opa-jackson/build.gradle.kts b/opa-jackson/build.gradle.kts
index f6117b03..00b11ad1 100644
--- a/opa-jackson/build.gradle.kts
+++ b/opa-jackson/build.gradle.kts
@@ -12,7 +12,7 @@ dependencies {
     implementation("com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.17.0")
     implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.17.0")
 
-    testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:6.1.0")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher:1.10.1")
     testImplementation("org.assertj:assertj-core:3.27.7")
 }
diff --git a/opa-services/build.gradle.kts b/opa-services/build.gradle.kts
index 922e197c..427c2b98 100644
--- a/opa-services/build.gradle.kts
+++ b/opa-services/build.gradle.kts
@@ -18,7 +18,7 @@ dependencies {
     // RegoValueModule. Test code in this module bridges JsonNode <-> RegoObject via that module.
     runtimeOnly(project(":opa-jackson"))
 
-    testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:6.1.0")
     testImplementation("org.junit.jupiter:junit-jupiter-params:5.8.2")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher:1.10.1")
     testImplementation("org.assertj:assertj-core:3.27.7")
diff --git a/opa-slf4j/build.gradle.kts b/opa-slf4j/build.gradle.kts
index 9f549a80..d2ec7cd0 100644
--- a/opa-slf4j/build.gradle.kts
+++ b/opa-slf4j/build.gradle.kts
@@ -10,7 +10,7 @@ dependencies {
     api(project(":opa-evaluator"))
     implementation("org.slf4j:slf4j-api:2.0.18")
 
-    testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:6.1.0")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher:1.10.1")
     testImplementation("org.assertj:assertj-core:3.27.7")
     // Log4j 2 as the SLF4J backend for tests