diff --git a/Dockerfile b/Dockerfile
index c60cd49..602c1be 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/civil-rtl-export.jar /opt/app/