diff --git a/x-pack/plugin/watcher/build.gradle b/x-pack/plugin/watcher/build.gradle
index 3ebc8927a23..33171bdbf5e 100644
--- a/x-pack/plugin/watcher/build.gradle
+++ b/x-pack/plugin/watcher/build.gradle
@@ -34,7 +34,7 @@ dependencies {
     // watcher deps
     compile 'com.googlecode.owasp-java-html-sanitizer:owasp-java-html-sanitizer:r239'
     compile 'com.google.guava:guava:16.0.1' // needed by watcher for the html sanitizer
-    compile 'com.sun.mail:jakarta.mail:1.6.3'
+    compile 'com.sun.mail:jakarta.mail:1.6.4'
     compile 'com.sun.activation:jakarta.activation:1.2.1'
     compileOnly "org.apache.httpcomponents:httpclient:${versions.httpclient}"
     compileOnly "org.apache.httpcomponents:httpcore:${versions.httpcore}"
diff --git a/x-pack/plugin/watcher/licenses/jakarta.mail-1.6.3.jar.sha1 b/x-pack/plugin/watcher/licenses/jakarta.mail-1.6.3.jar.sha1
deleted file mode 100644
index 12d5021ee37..00000000000
--- a/x-pack/plugin/watcher/licenses/jakarta.mail-1.6.3.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-787e007e377223bba85a33599d3da416c135f99b
\ No newline at end of file
diff --git a/x-pack/plugin/watcher/licenses/jakarta.mail-1.6.4.jar.sha1 b/x-pack/plugin/watcher/licenses/jakarta.mail-1.6.4.jar.sha1
new file mode 100644
index 00000000000..61664ee45cc
--- /dev/null
+++ b/x-pack/plugin/watcher/licenses/jakarta.mail-1.6.4.jar.sha1
@@ -0,0 +1 @@
+5015f335c2b974b1a7d08718edc326f0dc613c8a
\ No newline at end of file