diff --git a/src/alldev.Dockerfile b/src/alldev.Dockerfile
index 1f0a417..6e29b23 100644
--- a/src/alldev.Dockerfile
+++ b/src/alldev.Dockerfile
@@ -11,7 +11,7 @@ FROM phusion/baseimage:jammy-1.0.1
 ARG FLYWAY_VERSIONS="7.15.0,9.9.0"
 ARG GO_VERSION="1.21.4"
 ARG HUGO_VERSION="0.120.4"
-ARG KOTLIN_VERSION="1.9.10"
+ARG KOTLIN_VERSION="1.9.20"
 ARG NOMAD_VERSION="1.6.3"
 ARG VENOM_VERSION="v1.1.0"
 MAINTAINER info@tecnick.com
diff --git a/src/gocd-agent-java.Dockerfile b/src/gocd-agent-java.Dockerfile
index 1002533..fac3ebc 100644
--- a/src/gocd-agent-java.Dockerfile
+++ b/src/gocd-agent-java.Dockerfile
@@ -11,7 +11,7 @@ ARG UBUNTU_VERSION="22.04"
 ARG GOCD_VERSION="v23.3.0"
 FROM gocd/gocd-agent-ubuntu-${UBUNTU_VERSION}:${GOCD_VERSION}
 ARG NOMAD_VERSION="1.6.3"
-ARG KOTLIN_VERSION="1.9.10"
+ARG KOTLIN_VERSION="1.9.20"
 ARG VENOM_VERSION="v1.1.0"
 MAINTAINER info@tecnick.com
 USER root
diff --git a/src/gocd-agent.Dockerfile b/src/gocd-agent.Dockerfile
index 0d42f8a..ce4137a 100644
--- a/src/gocd-agent.Dockerfile
+++ b/src/gocd-agent.Dockerfile
@@ -13,7 +13,7 @@ FROM gocd/gocd-agent-ubuntu-${UBUNTU_VERSION}:${GOCD_VERSION}
 ARG FLYWAY_VERSIONS="7.15.0,9.9.0"
 ARG GO_VERSION="1.21.4"
 ARG HUGO_VERSION="0.120.4"
-ARG KOTLIN_VERSION="1.9.10"
+ARG KOTLIN_VERSION="1.9.20"
 ARG NOMAD_VERSION="1.6.3"
 ARG VENOM_VERSION="v1.1.0"
 MAINTAINER info@tecnick.com