diff --git a/Dockerfile b/Dockerfile
index d398e25..2d687f0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -27,7 +27,7 @@
 
 COPY init.groovy /usr/share/jenkins/ref/init.groovy.d/tcp-slave-agent-port.groovy
 
-ENV JENKINS_VERSION 1.609.2
+ENV JENKINS_VERSION 1.609.3
 ENV JENKINS_SHA f5ad5f749c759da7e1a18b96be5db974f126b71e
 
 # could use ADD but this one does not check Last-Modified header