diff --git a/libcxx/utils/ci/Dockerfile b/libcxx/utils/ci/Dockerfile
--- a/libcxx/utils/ci/Dockerfile
+++ b/libcxx/utils/ci/Dockerfile
@@ -28,7 +28,7 @@
 #   $ docker push ldionne/libcxx-builder
 #
 
-FROM ubuntu:focal
+FROM ubuntu:jammy
 
 # Make sure apt-get doesn't try to prompt for stuff like our time zone, etc.
 ENV DEBIAN_FRONTEND=noninteractive
@@ -56,10 +56,12 @@
 
 # Install Clang <latest>, <latest-1> and ToT, which are the ones we support.
 # We also install <latest-2> to allow smooth CI transitions around release points.
+# TODO enable LVM_LATEST_VERSION - 2 after changing to version 15
+# Normally this is enabled but LLVM 12 isn't backported to Jammy.
 ENV LLVM_LATEST_VERSION=14
 RUN apt-get update && apt-get install -y lsb-release wget software-properties-common
 RUN wget https://apt.llvm.org/llvm.sh -O /tmp/llvm.sh
-RUN bash /tmp/llvm.sh $(($LLVM_LATEST_VERSION - 2)) # for CI transitions
+#RUN bash /tmp/llvm.sh $(($LLVM_LATEST_VERSION - 2)) # for CI transitions
 RUN bash /tmp/llvm.sh $(($LLVM_LATEST_VERSION - 1)) # previous release
 RUN bash /tmp/llvm.sh $LLVM_LATEST_VERSION          # latest release
 RUN bash /tmp/llvm.sh $(($LLVM_LATEST_VERSION + 1)) # current ToT
@@ -79,10 +81,10 @@
 RUN apt-get install -y clang-tidy-$LLVM_LATEST_VERSION
 RUN ln -s /usr/bin/clang-tidy-$LLVM_LATEST_VERSION /usr/bin/clang-tidy && [ -e $(readlink /usr/bin/clang-tidy) ]
 
-# Install the most recent GCC
-ENV GCC_LATEST_VERSION=11
-RUN add-apt-repository ppa:ubuntu-toolchain-r/test
+# Install the most recent GCC, like clang install the previous version as a transition.
+ENV GCC_LATEST_VERSION=12
 RUN apt-get update && apt install -y gcc-$GCC_LATEST_VERSION g++-$GCC_LATEST_VERSION
+RUN apt-get update && apt install -y gcc-$((GCC_LATEST_VERSION - 1)) g++-$((GCC_LATEST_VERSION - 1))
 
 # Install a recent CMake
 RUN wget https://github.com/Kitware/CMake/releases/download/v3.21.1/cmake-3.21.1-linux-x86_64.sh -O /tmp/install-cmake.sh