diff --git a/Dockerfile b/Dockerfile
index 3cbf4d6..9bc7376 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 # Dockerfile for Knowledge
 
-FROM tomcat:jre8
+FROM tomcat:9-jre8
 
 # ==== dumb-init ====
 RUN apt-get update && \