diff --git a/spring-boot-project/spring-boot-dependencies/build.gradle b/spring-boot-project/spring-boot-dependencies/build.gradle
index d8c29b4fea..9263f799e3 100644
--- a/spring-boot-project/spring-boot-dependencies/build.gradle
+++ b/spring-boot-project/spring-boot-dependencies/build.gradle
@@ -1719,7 +1719,7 @@ bom {
 			]
 		}
 	}
-	library("Sun Mail", "1.6.5") {
+	library("Sun Mail", "1.6.6") {
 		prohibit("[2.0.0-RC1,)") {
 			because "it uses the jakarta.* namespace"
 		}