diff --git a/Dockerfile b/Dockerfile
index c1c721c..4ab9728 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -34,9 +34,9 @@
 COPY init.groovy /usr/share/jenkins/ref/init.groovy.d/tcp-slave-agent-port.groovy
 
 ARG JENKINS_VERSION
-ENV JENKINS_VERSION ${JENKINS_VERSION:-2.3}
+ENV JENKINS_VERSION ${JENKINS_VERSION:-1.651.2}
 ARG JENKINS_SHA
-ENV JENKINS_SHA ${JENKINS_SHA:-d3097c9c81c7d5074d71a5059d85cf8977c1568e}
+ENV JENKINS_SHA ${JENKINS_SHA:-f61b8b604acba5076a93dcde28c0be2561d17bde}
 
 
 # could use ADD but this one does not check Last-Modified header