diff --git a/libcxx/utils/ci/Dockerfile b/libcxx/utils/ci/Dockerfile
--- a/libcxx/utils/ci/Dockerfile
+++ b/libcxx/utils/ci/Dockerfile
@@ -30,7 +30,7 @@
 #   $ docker push ldionne/libcxx-builder
 #
 
-FROM ubuntu:jammy
+FROM ubuntu:lunar
 
 # Make sure apt-get doesn't try to prompt for stuff like our time zone, etc.
 ENV DEBIAN_FRONTEND=noninteractive
@@ -95,7 +95,7 @@
                                      libclang-$(($LLVM_HEAD_VERSION - 2))-dev libclang-$(($LLVM_HEAD_VERSION - 1))-dev libclang-$LLVM_HEAD_VERSION-dev
 
 # Install the most recent GCC, like clang install the previous version as a transition.
-ENV GCC_LATEST_VERSION=12
+ENV GCC_LATEST_VERSION=13
 RUN apt-get update && apt install -y gcc-$((GCC_LATEST_VERSION - 1)) g++-$((GCC_LATEST_VERSION - 1))
 RUN apt-get update && apt install -y gcc-$GCC_LATEST_VERSION g++-$GCC_LATEST_VERSION