Bump to 2.3 security release
diff --git a/Dockerfile b/Dockerfile
index 4d7398e..c1c721c 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:-2.0}
+ENV JENKINS_VERSION ${JENKINS_VERSION:-2.3}
ARG JENKINS_SHA
-ENV JENKINS_SHA ${JENKINS_SHA:-da06f963edb627f0ced2fce612f9985d1928f79b}
+ENV JENKINS_SHA ${JENKINS_SHA:-d3097c9c81c7d5074d71a5059d85cf8977c1568e}
# could use ADD but this one does not check Last-Modified header