diff --git a/build.gradle b/build.gradle
index 25456f4..cf18363 100644
--- a/build.gradle
+++ b/build.gradle
@@ -100,7 +100,7 @@ dependencies {
   testImplementation project.deps.gocdPluginApi
   testImplementation group: 'uk.org.webcompere', name: 'system-stubs-jupiter', version: '2.1.5'
   testImplementation group: 'org.assertj', name: 'assertj-core', version: '3.25.1'
-  testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.8.0'
+  testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.9.0'
   testImplementation group: 'org.skyscreamer', name: 'jsonassert', version: '1.5.1'
   testImplementation group: 'org.jsoup', name: 'jsoup', version: '1.17.2'
 }