diff --git a/.env b/.env
index da82ce84c9..b1e6d3c01e 100644
--- a/.env
+++ b/.env
@@ -1,8 +1,8 @@
 REPO=lifflander1/vt
 ARCH=amd64
-UBUNTU=18.04
+UBUNTU=22.04
 ULIMIT_CORE=0
-COMPILER=gcc-7
+COMPILER=gcc-12
 COMPILER_TYPE=gnu
 PROXY=
 CACHE=
diff --git a/.github/workflows/build-docs.yml b/.github/workflows/build-docs.yml
index dbb595636f..adee0fdc5d 100644
--- a/.github/workflows/build-docs.yml
+++ b/.github/workflows/build-docs.yml
@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - develop
+      - 2107-remove-obsolete-builds
 
 jobs:
 
@@ -14,9 +15,9 @@ jobs:
     env:
       REPO: lifflander1/vt
       ARCH: amd64
-      UBUNTU: 18.04
+      UBUNTU: 22.04
       COMPILER_TYPE: gnu
-      COMPILER: gcc-7
+      COMPILER: gcc-12
       BUILD_TYPE: release
       ULIMIT_CORE: 0
       VT_LB: 1
diff --git a/README.md b/README.md
index 51d72e0bae..1c44d1c59e 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,6 @@
 [![codecov](https://codecov.io/gh/DARMA-tasking/vt/branch/develop/graph/badge.svg)](https://codecov.io/gh/DARMA-tasking/vt)
 [![License](https://img.shields.io/badge/License-BSD%203--Clause-orange.svg)](https://opensource.org/licenses/BSD-3-Clause)
 ![](https://github.com/DARMA-tasking/vt/workflows/Docker%20Image%20CI/badge.svg)
-[![gcc-7, ubuntu, mpich, trace runtime, LB](https://dev.azure.com/DARMA-tasking/DARMA/_apis/build/status/PR%20tests%20(gcc-7%2C%20ubuntu%2C%20mpich%2C%20trace%20runtime%2C%20LB)?branchName=develop&Label=(gcc-7%2C%20ubuntu%2C%20mpich%2C%20trace%20runtime%2C%20LB))](https://dev.azure.com/DARMA-tasking/DARMA/_build/latest?definitionId=8&branchName=develop)
 [![gcc-8, ubuntu, mpich, address sanitizer](https://dev.azure.com/DARMA-tasking/DARMA/_apis/build/status/PR%20tests%20(gcc-8%2C%20ubuntu%2C%20mpich%2C%20address%20sanitizer)?branchName=develop&Label=(gcc-8%2C%20ubuntu%2C%20mpich%2C%20address%20sanitizer))](https://dev.azure.com/DARMA-tasking/DARMA/_build/latest?definitionId=9&branchName=develop)
 [![gcc-9, ubuntu, mpich, zoltan](https://dev.azure.com/DARMA-tasking/DARMA/_apis/build/status/PR%20tests%20(gcc-9%2C%20ubuntu%2C%20mpich%2C%20zoltan)?branchName=develop&Label=(gcc-9%2C%20ubuntu%2C%20mpich%2C%20zoltan))](https://dev.azure.com/DARMA-tasking/DARMA/_build/latest?definitionId=10&branchName=develop)
 [![gcc-10, ubuntu, openmpi, no LB](https://dev.azure.com/DARMA-tasking/DARMA/_apis/build/status/PR%20tests%20(gcc-10%2C%20ubuntu%2C%20openmpi%2C%20no%20LB)?branchName=develop&Label=(gcc-10%2C%20ubuntu%2C%20openmpi%2C%20no%20LB))](https://dev.azure.com/DARMA-tasking/DARMA/_build/latest?definitionId=4&branchName=develop)
diff --git a/ci/docker/develop.dockerfile b/ci/docker/develop.dockerfile
index ba5cc734cc..d7409bd0d4 100644
--- a/ci/docker/develop.dockerfile
+++ b/ci/docker/develop.dockerfile
@@ -1,11 +1,11 @@
-ARG compiler=gcc-7
+ARG compiler=gcc-12
 ARG arch=amd64
-ARG ubuntu=18.04
+ARG ubuntu=22.04
 
 FROM lifflander1/vt:${arch}-ubuntu-${ubuntu}-${compiler}-cpp
 
 # All ARGs are invalidated after FROM instruction, so it has to be redefined
-ARG compiler=gcc-7
+ARG compiler=gcc-12
 
 ARG proxy=""
 ENV https_proxy=${proxy} \
diff --git a/ci/docker/ubuntu-18.04-gnu-docs.dockerfile b/ci/docker/ubuntu-gnu-docs.dockerfile
similarity index 97%
rename from ci/docker/ubuntu-18.04-gnu-docs.dockerfile
rename to ci/docker/ubuntu-gnu-docs.dockerfile
index b88af792e3..e35b93ca78 100644
--- a/ci/docker/ubuntu-18.04-gnu-docs.dockerfile
+++ b/ci/docker/ubuntu-gnu-docs.dockerfile
@@ -1,8 +1,8 @@
 ARG arch=amd64
-FROM ${arch}/ubuntu:18.04 as base
+FROM ${arch}/ubuntu:22.04 as base
 
 ARG proxy=""
-ARG compiler=gcc-7
+ARG compiler=gcc-12
 ARG token
 
 ENV https_proxy=${proxy} \
diff --git a/docker-compose.yml b/docker-compose.yml
index f9048ba96d..f6194deeb4 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -10,13 +10,12 @@
 # Variables:
 #   ARCH={amd64, arm64v8, ...}
 #   COMPILER_TYPE={gnu, clang, intel, nvidia}
-#   COMPILER={gcc-7, gcc-8, gcc-9, gcc-10,
-#             clang-4.0, clang-5.0, clang-6.0, clang-7, clang-8,
-#             clang-9, clang-10,
-#             icpx,
+#   COMPILER={gcc-8, gcc-9, gcc-10,
+#             clang-8, clang-9, clang-10,
+#             icpc, icpx,
 #             nvcc-11, nvcc-11.2}
 #   REPO=lifflander1/vt
-#   UBUNTU={18.04, 20.04}
+#   UBUNTU={18.04, 20.04, 22.04}
 #   ULIMIT_CORE=0
 #
 # DARMA/vt Configuration Variables:
@@ -70,43 +69,27 @@ version: '3.5'
 # add it to this list. For example, for ARM64v8 on Ubuntu 20.04 with clang-9,
 # add `arm64v8-ubuntu-20.04-clang-9-cache`.
 volumes:
-  amd64-ubuntu-18.04-clang-4.0-cache:
-  amd64-ubuntu-18.04-clang-5.0-cache:
-  amd64-ubuntu-18.04-clang-6.0-cache:
-  amd64-ubuntu-18.04-clang-7-cache:
   amd64-ubuntu-18.04-clang-8-cache:
   amd64-ubuntu-18.04-clang-9-cache:
   amd64-ubuntu-20.04-clang-10-cache:
   amd64-ubuntu-22.04-clang-11-cache:
-  amd64-ubuntu-18.04-gcc-7-cache:
   amd64-ubuntu-18.04-gcc-8-cache:
   amd64-ubuntu-20.04-gcc-9-cache:
   amd64-ubuntu-20.04-gcc-10-cache:
+  amd64-ubuntu-22.04-gcc-12-cache:
   amd64-ubuntu-18.04-icpx-cache:
   amd64-ubuntu-18.04-icpc-cache:
   amd64-ubuntu-18.04-nvcc-11-cache:
   amd64-ubuntu-18.04-nvcc-11.2-cache:
-  amd64-alpine-clang-4.0-cache:
-  amd64-alpine-clang-5.0-cache:
-  amd64-alpine-clang-6.0-cache:
-  amd64-alpine-clang-7-cache:
-  amd64-alpine-clang-8-cache:
-  amd64-alpine-clang-9-cache:
   amd64-alpine-clang-10-cache:
   amd64-alpine-clang-11-cache:
-  amd64-alpine-gcc-7-cache:
   amd64-alpine-gcc-8-cache:
   amd64-alpine-gcc-9-cache:
   amd64-alpine-gcc-10-cache:
-  amd64-alpine-icc-18-cache:
-  amd64-alpine-icc-19-cache:
-  amd64-alpine-icc-20-cache:
   amd64-alpine-icpx-cache:
   amd64-alpine-icpc-cache:
   amd64-alpine-nvcc-11-cache:
   amd64-alpine-nvcc-11.2-cache:
-  arm64v8-ubuntu-18.04-gcc-7-cache:
-  arm64v8-alpine-gcc-7-cache:
 
 # Define basic rules for ccache used across multiple services. The beauty of
 # docker compose with cached volumes is that similarly configured builds will
@@ -158,8 +141,8 @@ x-vtopts: &vtopts
 services:
   ##############################################################################
   # C++ builds of VT on ubuntu/alpine platform from container baseline
-  # Ubuntu gcc-7 debug build:
-  #   docker-compose run -e CMAKE_BUILD_TYPE=debug ubuntu-cpp|alpine-cpp
+  # Ubuntu gcc-12 debug build:
+  #   docker-compose run -e CMAKE_BUILD_TYPE=debug ubuntu-cpp
   ubuntu-cpp:
     image: ${REPO}:${ARCH}-ubuntu-${UBUNTU}-${COMPILER}-cpp
     build:
@@ -341,7 +324,7 @@ services:
     build:
       context: .
       target: base
-      dockerfile: ci/docker/ubuntu-${UBUNTU}-${COMPILER_TYPE}-docs.dockerfile
+      dockerfile: ci/docker/ubuntu-${COMPILER_TYPE}-docs.dockerfile
       cache_from:
         - ${REPO}:${ARCH}-ubuntu-${UBUNTU}-${COMPILER}-cpp
       args:
@@ -387,7 +370,7 @@ services:
     build:
       context: .
       target: base
-      dockerfile: ci/docker/ubuntu-${UBUNTU}-${COMPILER_TYPE}-docs.dockerfile
+      dockerfile: ci/docker/ubuntu-${COMPILER_TYPE}-docs.dockerfile
       cache_from:
         - ${REPO}:${ARCH}-ubuntu-${UBUNTU}-${COMPILER}-cpp
       args:
diff --git a/docs/md/building.md b/docs/md/building.md
index d47c2b7048..4669cbfbee 100644
--- a/docs/md/building.md
+++ b/docs/md/building.md
@@ -139,13 +139,12 @@ which `docker-compose` will read.
 # Variables:
 #   ARCH={amd64, arm64v8, ...}
 #   COMPILER_TYPE={gnu, clang, intel, nvidia}
-#   COMPILER={gcc-7, gcc-8, gcc-9, gcc-10,
-#             clang-4.0, clang-5.0, clang-6.0, clang-7, clang-8,
-#             clang-9, clang-10,
-#             icc-18, icc-19,
-#             nvcc-10, nvcc-11, nvcc-11.2}
+#   COMPILER={gcc-8, gcc-9, gcc-10,
+#             clang-8, clang-9, clang-10,
+#             icpc, icpx,
+#             nvcc-11, nvcc-11.2}
 #   REPO=lifflander1/vt
-#   UBUNTU={18.04, 20.04}
+#   UBUNTU={18.04, 20.04, 22.04}
 #   ULIMIT_CORE=0
 #
 # DARMA/vt Configuration Variables: