diff --git a/pom.xml b/pom.xml
index 27abdec..7cddde6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -234,7 +234,7 @@
 		<dependency>
 			<groupId>com.icegreen</groupId>
 			<artifactId>greenmail</artifactId>
-			<version>1.5.5</version>
+			<version>1.6.4</version>
 			<scope>test</scope>
 		</dependency>