diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4001479fce..e53d61184f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -294,7 +294,7 @@ jobs:
             setenvs: export LIBJPEGTURBO_VERSION=3.0.1
                             LIBRAW_VERSION=0.21.2
                             LIBTIFF_VERSION=v4.6.0
-                            OPENCOLORIO_VERSION=v2.3.1
+                            OPENCOLORIO_VERSION=v2.3.2
                             OPENJPEG_VERSION=v2.4.0
                             PTEX_VERSION=v2.4.2
                             PUGIXML_VERSION=v1.14
@@ -452,7 +452,7 @@ jobs:
 
 
   macrunner:
-    name: "${{matrix.runner}} appleclang${{matrix.aclang}}/C++${{matrix.cxx_std}} py${{matrix.python_ver}} ${{matrix.desc}} boost1.76 exr3.1 ocio2.1"
+    name: "${{matrix.runner}} appleclang${{matrix.aclang}}/C++${{matrix.cxx_std}} py${{matrix.python_ver}} ${{matrix.desc}}"
     strategy:
       fail-fast: false
       matrix:
@@ -463,20 +463,25 @@ jobs:
             cxx_std: 17
             python_ver: "3.10"
             aclang: 13
-            setenvs: export CTEST_TEST_TIMEOUT=600
           - desc: MacOS-13
             runner: macos-13
             nametag: macos13-py311
-            cxx_std: 20
+            cxx_std: 17
             python_ver: "3.11"
             aclang: 14
-            setenvs: export CTEST_TEST_TIMEOUT=600
+          - desc: MacOS-14-ARM
+            runner: macos-14
+            nametag: macos14-arm-py311
+            cxx_std: 20
+            python_ver: "3.11"
+            aclang: 15
     runs-on: ${{ matrix.runner }}
     env:
       CC: clang
       CXX: clang++
       CMAKE_CXX_STANDARD: ${{ matrix.cxx_std }}
       PYTHON_VERSION: ${{ matrix.python_ver }}
+      CTEST_TEST_TIMEOUT: 600
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - name: Prepare ccache timestamp
diff --git a/.github/workflows/macarm.yml b/.github/workflows/macarm.yml
deleted file mode 100644
index 4ee836c149..0000000000
--- a/.github/workflows/macarm.yml
+++ /dev/null
@@ -1,100 +0,0 @@
-# Copyright Contributors to the OpenImageIO project.
-# SPDX-License-Identifier: Apache-2.0
-# https://github.com/AcademySoftwareFoundation/OpenImageIO
-
-
-# This workflow is for CI for ARM-based MacOS. In an ideal world, this would
-# just be another matrix entry in the main CI workflow, but MacOS ARM runners
-# too expensive to run on every PR push. So we break into a separate workflow
-# to have more fine-grained control over when it runs.
-
-name: CI-Mac-ARM
-
-# This section controls when the workflow runs.
-on:
-  # Run upon push, but only for tagged versions, or if the branch name
-  # contains the substrings "macarm", "-alpha", "-beta", or is called
-  # "release".
-  push:
-    tags:
-      - v**
-    branches:
-      - '*macarm*'
-      - '*alpha*'
-      - '*beta*'
-      - 'release'
-  # Run for pull requests whose branch name includes "macarm" (this allows
-  # us to test specific PRs that we think need ARM verification).
-  pull_request: {}
-  # Run monthly on the 27th (a few days before patch releases) to make sure we
-  # haven't broken anything among the many PRs that didn't test on ARM.
-  schedule:
-    - cron: "0 8 27 * *"
-      if: github.repository == 'AcademySoftwareFoundation/OpenImageIO'
-
-permissions: read-all
-
-
-jobs:
-  # This section should remain an identical copy of the main CI workflow job
-  # for MacOS.
-  macos-arm:
-    name: "${{matrix.os}} appleclang${{matrix.aclang}}/C++${{matrix.cxx_std}} py${{matrix.python_ver}} ${{matrix.desc}} boost1.76 exr3.1 ocio2.1"
-    # Needs special runners, only run on the main repo,
-    if: github.repository == 'AcademySoftwareFoundation/OpenImageIO' &&
-        ((github.event_name == 'pull_request' && contains(github.head_ref, 'macarm')) ||
-         (github.event_name == 'push' || github.event_name == 'schedule'))
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - desc: MacOS-13 ARM
-            os: macos-13-xlarge
-            nametag: macos13-arm-py311
-            cxx_std: 17
-            python_ver: "3.11"
-            aclang: 14
-            setenvs: export CTEST_TEST_TIMEOUT=600 USE_OPENCV=0 USE_QT=0
-    runs-on: ${{ matrix.os }}
-    env:
-      CC: clang
-      CXX: clang++
-      CMAKE_CXX_STANDARD: ${{ matrix.cxx_std }}
-      PYTHON_VERSION: ${{ matrix.python_ver }}
-    steps:
-      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-      - name: Prepare ccache timestamp
-        id: ccache_cache_keys
-        run: echo "::set-output name=date::`date -u +'%Y-%m-%dT%H:%M:%SZ'`"
-      - name: ccache
-        id: ccache
-        uses: actions/cache@13aacd865c20de90d75de3b17ebe84f7a17d57d2 # v4.0.0
-        with:
-          path: /Users/runner/.ccache
-          key: ${{github.job}}-${{matrix.nametag}}-${{ steps.ccache_cache_keys.outputs.date }}
-          restore-keys: ${{github.job}}-
-      - name: Build setup
-        run: |
-            ${{matrix.setenvs}}
-            src/build-scripts/ci-startup.bash
-      - name: Dependencies
-        run: |
-            src/build-scripts/install_homebrew_deps.bash
-            ${{matrix.depcmds}}
-      - name: Build
-        run: |
-            export PYTHONPATH=/usr/local/lib/python${PYTHON_VERSION}/site-packages:$PYTHONPATH
-            src/build-scripts/ci-build.bash
-      - name: Testsuite
-        run: src/build-scripts/ci-test.bash
-      - uses: actions/upload-artifact@26f96dfa697d77e81fd5907df203aa23a56210a8 # v4.3.0
-        if: failure()
-        with:
-          name: oiio-${{github.job}}-${{matrix.nametag}}
-          path: |
-            build/cmake-save
-            build/testsuite/*/*.*
-            !build/testsuite/oiio-images
-            !build/testsuite/openexr-images
-            !build/testsuite/fits-images
-            !build/testsuite/j2kp4files_v1_5