diff --git a/build.gradle b/build.gradle
index 6ba0c70..95edcc3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -160,7 +160,7 @@ dependencies {
     testImplementation 'junit:junit:4.13.2'
     testImplementation 'com.github.tomakehurst:wiremock:2.27.2'
     testImplementation 'com.unboundid:unboundid-ldapsdk:4.0.14'
-    testImplementation 'com.icegreen:greenmail:1.5.11'
+    testImplementation 'com.icegreen:greenmail:1.6.15'
 }
 
 jar {