diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7187bd3..ea4416e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -28,8 +28,8 @@ jobs:
         m:
           - {os: ubuntu-22.04, dds_security: 1}
           - {os: ubuntu-22.04, dds_security: 0}
-          - {os: macos-12, dds_security: 1}
-          - {os: macos-12, dds_security: 0}
+          - {os: macos-13, dds_security: 1}
+          - {os: macos-13, dds_security: 0}
           - {os: windows-2022, dds_security: 1}
           - {os: windows-2022, dds_security: 0}
 
@@ -66,7 +66,7 @@ jobs:
           sudo apt-get update
           sudo apt-get -y install libxerces-c-dev
       - name: 'Install xerces (macos)'
-        if: ${{ matrix.m.dds_security == 1 && matrix.m.os == 'macos-12' }}
+        if: ${{ matrix.m.dds_security == 1 && matrix.m.os == 'macos-13' }}
         run: |
           brew install xerces-c
       - name: Setup for run-vcpkg
@@ -90,10 +90,10 @@ jobs:
         if: ${{ matrix.m.os == 'windows-2022' }}
         uses: ammaraskar/msvc-problem-matcher@0.3.0
       - name: 'Set Up Problem Matcher (ubuntu / macos)'
-        if: ${{ matrix.m.os == 'ubuntu-22.04' || matrix.m.os == 'macos-12' }}
+        if: ${{ matrix.m.os == 'ubuntu-22.04' || matrix.m.os == 'macos-13' }}
         uses: ammaraskar/gcc-problem-matcher@0.3.0
       - name: 'Set environment variables (ubuntu / macos)'
-        if: ${{ matrix.m.os == 'ubuntu-22.04' || matrix.m.os == 'macos-12' }}
+        if: ${{ matrix.m.os == 'ubuntu-22.04' || matrix.m.os == 'macos-13' }}
         shell: bash
         run: |-
           echo "ACE_ROOT=$GITHUB_WORKSPACE/ACE_TAO/ACE" >> $GITHUB_ENV
@@ -106,7 +106,7 @@ jobs:
           if [ ${{ matrix.m.dds_security }} == 1 ]; then
             CONFIG_OPTIONS+=" --security"
             BUILD_TARGETS+=" OpenDDS_Security"
-            if [ '${{ matrix.m.os }}' == 'macos-12' ]; then
+            if [ '${{ matrix.m.os }}' == 'macos-13' ]; then
               CONFIG_OPTIONS+=" --xerces3=$(brew --prefix xerces-c) --openssl=/usr/local/opt/openssl@1.1"
             fi
           fi
@@ -130,7 +130,7 @@ jobs:
           echo "BUILD_TARGETS=DCPSInfoRepo_Main;OpenDDS_Rtps_Udp$BUILD_TARGETS" >> $GITHUB_ENV
           echo "ACE_TEST_LOG_STUCK_STACKS=1" >> $GITHUB_ENV
       - name: 'Configure & Build OpenDDS (ubuntu / macos)'
-        if: ${{ matrix.m.os == 'ubuntu-22.04' || matrix.m.os == 'macos-12' }}
+        if: ${{ matrix.m.os == 'ubuntu-22.04' || matrix.m.os == 'macos-13' }}
         shell: bash
         run: |-
           echo "dds_security=${{ matrix.m.dds_security }}; CONFIG_OPTIONS=${{ env.CONFIG_OPTIONS }}; BUILD_TARGETS=${{ env.BUILD_TARGETS }}"
@@ -155,7 +155,7 @@ jobs:
           call setenv.cmd
           msbuild -p:Configuration=Debug,Platform=x64 -t:${{ env.BUILD_TARGETS }} -m DDS_TAOv2.sln
       - name: 'Install (ubuntu / macos)'
-        if: ${{ matrix.m.os == 'ubuntu-22.04' || matrix.m.os == 'macos-12' }}
+        if: ${{ matrix.m.os == 'ubuntu-22.04' || matrix.m.os == 'macos-13' }}
         shell: bash
         run: |-
           npm install
@@ -176,12 +176,12 @@ jobs:
           echo Core file pattern set to:
           cat /proc/sys/kernel/core_pattern
       - name: 'Change Cores Directory Permissions (macos)'
-        if: ${{ matrix.m.os == 'macos-12' }}
+        if: ${{ matrix.m.os == 'macos-13' }}
         shell: bash
         run: |
           sudo chmod o+w /cores
       - name: 'Test (ubuntu / macos)'
-        if: ${{ matrix.m.os == 'ubuntu-22.04' || matrix.m.os == 'macos-12' }}
+        if: ${{ matrix.m.os == 'ubuntu-22.04' || matrix.m.os == 'macos-13' }}
         shell: bash
         run: |-
           ulimit -c unlimited
@@ -193,7 +193,7 @@ jobs:
           ./run_test.pl node2cpp --rtps
           ./run_test.pl node2node --rtps
       - name: 'Test Secure (ubuntu / macos)'
-        if: ${{ (matrix.m.os == 'ubuntu-22.04' || matrix.m.os == 'macos-12') && matrix.m.dds_security == 1 }}
+        if: ${{ (matrix.m.os == 'ubuntu-22.04' || matrix.m.os == 'macos-13') && matrix.m.dds_security == 1 }}
         shell: bash
         run: |-
           ulimit -c unlimited