diff --git a/Dockerfile b/Dockerfile
index e01d3cd2..14019c1b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
  # renovate: datasource=github-releases depName=microsoft/ApplicationInsights-Java
 ARG APP_INSIGHTS_AGENT_VERSION=3.4.18
-FROM hmctspublic.azurecr.io/base/java:17-distroless
+FROM hmctspublic.azurecr.io/base/java:21-distroless
 
 COPY lib/applicationinsights.json /opt/app/
 COPY build/libs/opal-account-enquiry.jar /opt/app/