diff --git a/.github/workflows/master_build.yml b/.github/workflows/master_build.yml
index 8d9844e03c..2a29624179 100644
--- a/.github/workflows/master_build.yml
+++ b/.github/workflows/master_build.yml
@@ -1,6 +1,6 @@
 name: Master CI Build
 
-on: 
+on:
   push:
     branches:
       - master
@@ -20,7 +20,7 @@ env:
 
   # OSX-specific variables
   DEVELOPER_DIR: /Applications/Xcode_11.2.app/Contents/Developer
-  MACOSX_DEPLOYMENT_TARGET: '10.11'
+  MACOSX_DEPLOYMENT_TARGET: '10.12'
 
   # WIN-specific variables
   PreferredToolArchitecture: X64
@@ -64,7 +64,7 @@ jobs:
           echo "ZIP_COMMAND=zip" >> $GITHUB_ENV
           echo "ZIP_ARGS=-r" >> $GITHUB_ENV
           echo "INSTALLER_EXT=dmg" >> $GITHUB_ENV
-          echo "CMAKE_EXTRA=-DCMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED=OFF -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl -DOPENSSL_LIBRARIES=/usr/local/opt/openssl/lib -G Xcode" >> $GITHUB_ENV
+          echo "CMAKE_EXTRA=-DCMAKE_OSX_SYSROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -DCMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED=OFF -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl -DOPENSSL_LIBRARIES=/usr/local/opt/openssl/lib -G Xcode" >> $GITHUB_ENV
           echo "::set-output name=symbols_archive::${BUILD_NUMBER}-${{ matrix.build_type }}-mac-symbols.zip"
           echo "APP_TARGET_NAME=Vircadia" >> $GITHUB_ENV
         fi
@@ -104,43 +104,68 @@ jobs:
       with:
         submodules: false
         fetch-depth: 1
+
     - name: Install dependencies
-      if: startsWith(matrix.os, 'ubuntu')
       shell: bash
+      if: startsWith(matrix.os, 'ubuntu') || contains(matrix.os, 'debian') || startsWith(matrix.os, 'macOS')
       run: |
-        echo "Installing Python Modules:"
-        pip3 install distro || exit 1
-        echo "Updating apt repository index"
-        sudo apt update || exit 1
-        echo "Installing apt packages"
-        sudo apt install -y ${{ matrix.apt-dependencies }} || exit 1
+        if [[ "${{ matrix.os }}" =~ "ubuntu" || "${{ matrix.os }}" =~ "debian" ]]; then
+          echo "Installing Python Modules:"
+          pip3 install distro || exit 1
+
+          echo "Updating apt repository index"
+          sudo apt update || exit 1
+
+          echo "Installing apt packages"
+          sudo apt install -y ${{ matrix.apt-dependencies }} || exit 1
+        else # macOS
+          echo "Downloading MacOSX10.12 SDK.."
+          curl --progress-bar -L -O https://github.com/phracker/MacOSX-SDKs/releases/download/11.3/MacOSX10.12.sdk.tar.xz || exit 1
+          echo "  done\n"
+          echo "Extracting MacOSX10.12 SDK.."
+          tar -xf MacOSX10.12.sdk.tar.xz || exit 1
+          echo "  done\n"
+          echo "Installing MacOSX10.12 SDK.."
+          # cp always sets an error code while copying the SDK so we return 0 when that happens.
+          sudo cp -rp MacOSX10.12.sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/ || exit 0
+          echo "  done"
+        fi
+
+
     - name: Install Python modules
       if: startsWith(matrix.os, 'windows') || startsWith(matrix.os, 'macOS')
       shell: bash
       run: $PYTHON_EXEC -m pip install boto3 PyGithub
+
     - name: Create build environment
       shell: bash
       run: cmake -E make_directory "${{runner.workspace}}/build"
+
     - name: Configure CMake
       working-directory: ${{runner.workspace}}/build
       shell: bash
       run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DVCPKG_BUILD_TYPE=release -DCLIENT_ONLY:BOOLEAN=$CLIENT_ONLY -DBYPASS_SIGNING:BOOLEAN=TRUE $CMAKE_EXTRA
+
     - name: Build application
       working-directory: ${{runner.workspace}}/build
       shell: bash
       run: cmake --build . --config $BUILD_TYPE --target $APP_TARGET_NAME $CMAKE_BUILD_EXTRA
+
     - name: Build domain server
       working-directory: ${{runner.workspace}}/build
       shell: bash
       run: cmake --build . --config $BUILD_TYPE --target domain-server $CMAKE_BUILD_EXTRA
+
     - name: Build assignment client
       working-directory: ${{runner.workspace}}/build
       shell: bash
       run: cmake --build . --config $BUILD_TYPE --target assignment-client $CMAKE_BUILD_EXTRA
+
     - name: Build console
       working-directory: ${{runner.workspace}}/build
       shell: bash
       run: cmake --build . --config $BUILD_TYPE --target packaged-server-console $CMAKE_BUILD_EXTRA
+
     - name: Build installer
       working-directory: ${{runner.workspace}}/build
       shell: bash
@@ -167,11 +192,13 @@ jobs:
           done
         }
         retry cmake --build . --config $BUILD_TYPE --target package $CMAKE_BUILD_EXTRA
+
     #- name: Sign installer (Windows)
     #  if: startsWith(matrix.os, 'windows')
     #  shell: powershell
     #  working-directory: C:\Program Files (x86)\Windows Kits\10\bin\10.0.18362.0\x64
     #  run: .\signtool.exe sign /fd sha256 /f ${{runner.workspace}}\build\codesign.pfx /p ${{secrets.pfx_key}} /tr http://sha256timestamp.ws.symantec.com/sha256/timestamp /td SHA256 ${{runner.workspace}}\build\${env:INSTALLER}
+
     - name: Output system stats
       if: ${{ always() }}
       working-directory: ${{runner.workspace}}/build
@@ -179,19 +206,22 @@ jobs:
       run: |
         echo "Disk usage:"
         df -h
+
     - name: Output installer logs
       if: failure() && startsWith(matrix.os, 'windows')
       shell: bash
       working-directory: ${{runner.workspace}}/build
       run: cat ./_CPack_Packages/win64/NSIS/NSISOutput.log
+
     - name: Upload artifact
       if: startsWith(matrix.os, 'windows') || startsWith(matrix.os, 'macOS')
       shell: bash
-      working-directory: ${{runner.workspace}}/build	
-      env:	
+      working-directory: ${{runner.workspace}}/build
+      env:
         AWS_ACCESS_KEY_ID: ${{ secrets.aws_access_key_id }}
-        AWS_SECRET_ACCESS_KEY: ${{ secrets.aws_secret_access_key }}	
-      run: $PYTHON_EXEC $GITHUB_WORKSPACE/tools/ci-scripts/upload.py 
+        AWS_SECRET_ACCESS_KEY: ${{ secrets.aws_secret_access_key }}
+      run: $PYTHON_EXEC $GITHUB_WORKSPACE/tools/ci-scripts/upload.py
+
     #- name: Archive symbols
     #  if: startsWith(matrix.os, 'windows') || startsWith(matrix.os, 'macOS')
     #  working-directory: ${{runner.workspace}}
diff --git a/.github/workflows/pr_build.yml b/.github/workflows/pr_build.yml
index 9bd3f7fb12..d3c1054a7a 100644
--- a/.github/workflows/pr_build.yml
+++ b/.github/workflows/pr_build.yml
@@ -20,7 +20,7 @@ env:
 
   # OSX specific variables
   DEVELOPER_DIR: /Applications/Xcode_11.2.app/Contents/Developer
-  MACOSX_DEPLOYMENT_TARGET: '10.11'
+  MACOSX_DEPLOYMENT_TARGET: '10.12'
 
   # WIN32 specific variables
   PreferredToolArchitecture: X64
@@ -85,9 +85,9 @@ jobs:
           echo "PYTHON_EXEC=python3" >> $GITHUB_ENV
           echo "INSTALLER_EXT=dmg" >> $GITHUB_ENV
           if [ "${{ matrix.build_type }}" = "full" ]; then
-            echo "CMAKE_EXTRA=-DCMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED=OFF -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl -DOPENSSL_LIBRARIES=/usr/local/opt/openssl/lib -G Xcode" >> $GITHUB_ENV
+            echo "CMAKE_EXTRA=-DCMAKE_OSX_SYSROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -DCMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED=OFF -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl -DOPENSSL_LIBRARIES=/usr/local/opt/openssl/lib -G Xcode" >> $GITHUB_ENV
           else
-            echo "CMAKE_EXTRA=-DCLIENT_ONLY=1 -DCMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED=OFF -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl -DOPENSSL_LIBRARIES=/usr/local/opt/openssl/lib -G Xcode" >> $GITHUB_ENV
+            echo "CMAKE_EXTRA=-DCMAKE_OSX_SYSROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -DCLIENT_ONLY=1 -DCMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED=OFF -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl -DOPENSSL_LIBRARIES=/usr/local/opt/openssl/lib -G Xcode" >> $GITHUB_ENV
           fi
           echo "APP_TARGET_NAME=Vircadia" >> $GITHUB_ENV
         fi
@@ -139,16 +139,29 @@ jobs:
 
     - name: Install dependencies
       shell: bash
-      if: startsWith(matrix.os, 'ubuntu') || contains(matrix.os, 'debian')
+      if: startsWith(matrix.os, 'ubuntu') || contains(matrix.os, 'debian') || startsWith(matrix.os, 'macOS')
       run: |
-        echo "Installing Python Modules:"
-        pip3 install distro || exit 1
+        if [[ "${{ matrix.os }}" =~ "ubuntu" || "${{ matrix.os }}" =~ "debian" ]]; then
+          echo "Installing Python Modules:"
+          pip3 install distro || exit 1
 
-        echo "Updating apt repository index"
-        sudo apt update || exit 1
+          echo "Updating apt repository index"
+          sudo apt update || exit 1
 
-        echo "Installing apt packages"
-        sudo apt install -y ${{ matrix.apt-dependencies }} || exit 1
+          echo "Installing apt packages"
+          sudo apt install -y ${{ matrix.apt-dependencies }} || exit 1
+        else # macOS
+          echo "Downloading MacOSX10.12 SDK.."
+          curl --progress-bar -L -O https://github.com/phracker/MacOSX-SDKs/releases/download/11.3/MacOSX10.12.sdk.tar.xz || exit 1
+          echo "  done\n"
+          echo "Extracting MacOSX10.12 SDK.."
+          tar -xf MacOSX10.12.sdk.tar.xz || exit 1
+          echo "  done\n"
+          echo "Installing MacOSX10.12 SDK.."
+          # cp always sets an error code while copying the SDK so we return 0 when that happens.
+          sudo cp -rp MacOSX10.12.sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/ || exit 0
+          echo "  done"
+        fi
 
     - name: Create Build Environment
       shell: bash