diff --git a/gocd-filebased-authentication-plugin/build.gradle b/gocd-filebased-authentication-plugin/build.gradle
index 61c50a3..2619fb6 100644
--- a/gocd-filebased-authentication-plugin/build.gradle
+++ b/gocd-filebased-authentication-plugin/build.gradle
@@ -32,7 +32,7 @@ dependencies {
   testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-params'
   testRuntimeOnly group: 'org.junit.jupiter', name: 'junit-jupiter-engine'
   testRuntimeOnly group: 'org.junit.platform', name: 'junit-platform-launcher'
-  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.hamcrest', name: 'hamcrest', version: '2.2'
   testImplementation group: 'org.skyscreamer', name: 'jsonassert', version: '1.5.1'
 }
diff --git a/gocdpasswd/build.gradle b/gocdpasswd/build.gradle
index 0d8f270..bf7223c 100644
--- a/gocdpasswd/build.gradle
+++ b/gocdpasswd/build.gradle
@@ -23,7 +23,7 @@ dependencies {
   testRuntimeOnly group: 'org.junit.jupiter', name: 'junit-jupiter-engine'
   testRuntimeOnly group: 'org.junit.platform', name: 'junit-platform-launcher'
   testImplementation group: 'org.hamcrest', name: 'hamcrest', version: '2.2'
-  testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.8.0'
+  testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.9.0'
 }
 
 test {