diff --git a/docker/Dockerfile.clang13 b/docker/Dockerfile.clang13
index b2e70a47d..c436b14e1 100644
--- a/docker/Dockerfile.clang13
+++ b/docker/Dockerfile.clang13
@@ -27,7 +27,7 @@ RUN cmake -D$target=ON -DBUILD_CMD_LINE_TOOLS=ON -DBUILD_DEMONSTRATION=OFF .. &&
 # RELEASE stage
 #FROM alpine:latest as release    # hitting a segfault during startup of some playground programs
 #FROM debian:buster-slim as release
-FROM ubuntu:lunar-20231004 as release
+FROM ubuntu:mantic-20231011 as release
 LABEL Theodore Omtzigt
 
 #RUN apk add --no-cache libc6-compat libstdc++ cmake make bash gawk sed grep bc coreutils