diff --git a/.github/workflows/Dockerfile b/.github/workflows/Dockerfile
index a8bb2227ab..5ed81b94db 100644
--- a/.github/workflows/Dockerfile
+++ b/.github/workflows/Dockerfile
@@ -1,31 +1,36 @@
-# Based on old ubuntu to create more compatible binaries
+# Based on manylinux_2_28 (AlmaLinux 8, GLIBC 2.28) for maximum HPC compatibility
+# Binaries built here will run on RHEL/Rocky/Alma 8+, Ubuntu 20.04+, and most HPC clusters
 
 # To build (e.g. for ShapeWorks 6.7):
-#    docker build --progress=plain -t akenmorris/ubuntu-build-box-jammy-sw67 .
+#    docker build --progress=plain -t akenmorris/manylinux-build-box-sw67 .
 # To publish:
-#    docker push akenmorris/ubuntu-build-box-jammy-sw67
+#    docker push akenmorris/manylinux-build-box-sw67
 
-FROM ubuntu:jammy-20250819 AS env
+FROM quay.io/pypa/manylinux_2_28_x86_64 AS env
 MAINTAINER akenmorris@gmail.com
 
 # Set environment variables
-ENV PATH=/opt/conda/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+ENV PATH=/opt/rh/gcc-toolset-12/root/usr/bin:/opt/conda/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 
-ARG DEBIAN_FRONTEND=noninteractive
-ENV TZ=Etc/UTC
+# Enable PowerTools repo for additional development packages
+RUN dnf install -y dnf-plugins-core && dnf config-manager --set-enabled powertools
 
-# Update
-RUN apt-get update -y && apt-get upgrade -y && apt-get dist-upgrade -y && apt-get install build-essential software-properties-common -y && add-apt-repository ppa:ubuntu-toolchain-r/test -y && apt-get update -y
+# Update and install build tools
+# gcc-toolset-12 provides modern GCC 12 while keeping GLIBC 2.28 for binary compatibility.
+# The conda Qt5/ICU packages require GLIBCXX_3.4.28+ which system GCC 8 doesn't provide.
+RUN dnf update -y && dnf groupinstall -y "Development Tools" \
+    && dnf install -y gcc-toolset-12-gcc gcc-toolset-12-gcc-c++ gcc-toolset-12-binutils
+
+# Ensure gcc-toolset-12's libstdc++ is available at link time
+ENV LD_LIBRARY_PATH=/opt/rh/gcc-toolset-12/root/usr/lib64:/opt/rh/gcc-toolset-12/root/usr/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
 
 # Install git and git-lfs
-RUN add-apt-repository ppa:git-core/ppa
-RUN apt-get update
-RUN apt-get install git curl -y
-RUN curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh | bash
-RUN apt-get install git-lfs -y
+RUN dnf install -y git curl
+RUN curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.rpm.sh | bash
+RUN dnf install -y git-lfs
 
 # Install other dependencies
-RUN apt-get install rsync freeglut3-dev libgl1-mesa-dev libegl1-mesa zip libcups2 pigz wget ccache -y
+RUN dnf install -y rsync freeglut-devel mesa-libGL-devel mesa-libEGL-devel zip cups-libs pigz wget ccache
 
 # Install conda
 RUN curl https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh -o /tmp/Miniconda3-latest-Linux-x86_64.sh \
diff --git a/.github/workflows/build-linux-debug.yml b/.github/workflows/build-linux-debug.yml
index 84a107ae73..5cdc52f247 100644
--- a/.github/workflows/build-linux-debug.yml
+++ b/.github/workflows/build-linux-debug.yml
@@ -24,7 +24,7 @@ jobs:
   build:
 
     runs-on: ubuntu-latest
-    container: akenmorris/ubuntu-build-box-jammy-sw67
+    container: akenmorris/manylinux-build-box-sw67
     
     steps:
 
@@ -66,7 +66,7 @@ jobs:
       uses: actions/cache/restore@v3
       with:
         path: /github/home/install
-        key: ${{ runner.os }}-deps-debug-${{ hashFiles('.github/workflows/gha_deps.sh', 'install_shapeworks.sh', 'python_requirements.txt', 'build_dependencies.sh') }}
+        key: ${{ runner.os }}-deps-debug-${{ hashFiles('.github/workflows/Dockerfile', '.github/workflows/gha_deps.sh', 'install_shapeworks.sh', 'python_requirements.txt', 'build_dependencies.sh') }}
 
     - name: Check space3.5
       run: df -h
@@ -107,7 +107,7 @@ jobs:
       uses: actions/cache/save@v3
       with:
         path: /github/home/install
-        key: ${{ runner.os }}-deps-debug-${{ hashFiles('.github/workflows/gha_deps.sh', 'install_shapeworks.sh', 'python_requirements.txt', 'build_dependencies.sh') }}
+        key: ${{ runner.os }}-deps-debug-${{ hashFiles('.github/workflows/Dockerfile', '.github/workflows/gha_deps.sh', 'install_shapeworks.sh', 'python_requirements.txt', 'build_dependencies.sh') }}
 
     - name: Check space5
       run: df -h
diff --git a/.github/workflows/build-linux.yml b/.github/workflows/build-linux.yml
index a0c2fa6efd..994ee9482b 100644
--- a/.github/workflows/build-linux.yml
+++ b/.github/workflows/build-linux.yml
@@ -25,7 +25,7 @@ jobs:
   build:
 
     runs-on: ubuntu-latest
-    container: akenmorris/ubuntu-build-box-jammy-sw67
+    container: akenmorris/manylinux-build-box-sw67
     
     steps:
 
@@ -64,7 +64,7 @@ jobs:
       uses: actions/cache/restore@v3
       with:
         path: /github/home/install
-        key: ${{ runner.os }}-deps-${{ hashFiles('.github/workflows/gha_deps.sh', 'install_shapeworks.sh', 'python_requirements.txt', 'build_dependencies.sh') }}
+        key: ${{ runner.os }}-deps-${{ hashFiles('.github/workflows/Dockerfile', '.github/workflows/gha_deps.sh', 'install_shapeworks.sh', 'python_requirements.txt', 'build_dependencies.sh') }}
 
     - name: try import vtk
       shell: bash -l {0}
@@ -81,7 +81,7 @@ jobs:
       uses: actions/cache/save@v3
       with:
         path: /github/home/install
-        key: ${{ runner.os }}-deps-${{ hashFiles('.github/workflows/gha_deps.sh', 'install_shapeworks.sh', 'python_requirements.txt', 'build_dependencies.sh') }}
+        key: ${{ runner.os }}-deps-${{ hashFiles('.github/workflows/Dockerfile', '.github/workflows/gha_deps.sh', 'install_shapeworks.sh', 'python_requirements.txt', 'build_dependencies.sh') }}
 
     - name: Check space4
       run: df -h