diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 8052b7efd..9db7864bd 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -771,3 +771,272 @@ jobs:
       unreal-plugins-path: "C:/Program Files/Epic Games/UE_5.2/Engine/Plugins"
       test-package-base-name: "CesiumForUnreal-52"
     secrets: inherit
+  Windows53:
+    uses: ./.github/workflows/buildWindows.yml
+    with:
+      unreal-engine-version: "5.3.0"
+      unreal-runner-label: "unreal-53"
+      unreal-batch-files-path: "C:/Program Files/Epic Games/UE_5.3/Engine/Build/BatchFiles"
+      upload-package-base-name: "CesiumForUnreal-53-windows"
+  TestWindows53:
+    needs: [Windows53]
+    uses: ./.github/workflows/testWindows.yml
+    with:
+      unreal-runner-label: "unreal-53"
+      unreal-binaries-path: "C:/Program Files/Epic Games/UE_5.3/Engine/Binaries/Win64"
+      unreal-plugins-path: "C:/Program Files/Epic Games/UE_5.3/Engine/Plugins"
+      test-package-base-name: "CesiumForUnreal-53-windows"
+    secrets: inherit
+  Android53:
+    runs-on: ["self-hosted","windows","x64","unreal-53"]
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v3
+        with:
+          submodules: recursive
+          fetch-depth: 0 # so that `git describe` works.
+      - name: Set environment variables
+        run: |
+          $ENV:CESIUM_UNREAL_VERSION=$(git describe)
+          $ENV:BUILD_CESIUM_UNREAL_PACKAGE_NAME="CesiumForUnreal-53-android-${ENV:CESIUM_UNREAL_VERSION}"
+          # Make these available to subsequent steps
+          echo "CESIUM_UNREAL_VERSION=${ENV:CESIUM_UNREAL_VERSION}" >> $ENV:GITHUB_ENV
+          echo "BUILD_CESIUM_UNREAL_PACKAGE_NAME=${ENV:BUILD_CESIUM_UNREAL_PACKAGE_NAME}" >> $ENV:GITHUB_ENV
+      - name: Install nasm
+        uses: ilammy/setup-nasm@v1.4.0
+      - name: Build cesium-native
+        run: |
+          cd extern
+          cmake -B build-android -S . -G Ninja -DCMAKE_TOOLCHAIN_FILE="unreal-android-toolchain.cmake" -DCMAKE_POSITION_INDEPENDENT_CODE=ON -DCMAKE_BUILD_TYPE=Release
+          cmake --build build-android --config Release --target install -j8
+      - name: Build plugin
+        run: |
+          ((Get-Content -path CesiumForUnreal.uplugin -Raw) -replace '"EngineVersion": "5.0.0"','"EngineVersion": "5.3.0"') | Set-Content -Path CesiumForUnreal.uplugin
+          cd "C:/Program Files/Epic Games/UE_5.3/Engine/Build/BatchFiles"
+          ./RunUAT.bat BuildPlugin -Plugin="$ENV:GITHUB_WORKSPACE/CesiumForUnreal.uplugin" -Package="$ENV:GITHUB_WORKSPACE/packages/CesiumForUnreal" -CreateSubFolder -TargetPlatforms=Android -NoHostPlatform
+      - name: Publish plugin package artifact
+        if: ${{ success() }}
+        uses: actions/upload-artifact@v3
+        with:
+          name: ${{ env.BUILD_CESIUM_UNREAL_PACKAGE_NAME}}
+          path: packages
+  # Linux53:
+  #   runs-on: ["self-hosted","linux","x64","unreal-53"]
+  #   steps:
+  #     - name: Check out repository code
+  #       uses: actions/checkout@v3
+  #       with:
+  #         submodules: recursive
+  #         fetch-depth: 0 # so that `git describe` works.
+  #     - name: Set environment variables
+  #       run: |
+  #         export CESIUM_UNREAL_VERSION=$(git describe)
+  #         export BUILD_CESIUM_UNREAL_PACKAGE_NAME="CesiumForUnreal-53-linux-${CESIUM_UNREAL_VERSION}"
+  #         # Make these available to subsequent steps
+  #         echo "CESIUM_UNREAL_VERSION=${CESIUM_UNREAL_VERSION}" >> "$GITHUB_ENV"
+  #         echo "BUILD_CESIUM_UNREAL_PACKAGE_NAME=${BUILD_CESIUM_UNREAL_PACKAGE_NAME}" >> "$GITHUB_ENV"
+  #     - name: Install nasm
+  #       uses: ilammy/setup-nasm@v1.4.0
+  #     - name: Build cesium-native
+  #       run: |
+  #         export UNREAL_ENGINE_DIR="/opt/ue53"
+  #         export LINUX_MULTIARCH_ROOT="/opt/ue53/Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v22_clang-16.0.6-centos7/"
+  #         export UNREAL_ENGINE_COMPILER_DIR="${LINUX_MULTIARCH_ROOT}x86_64-unknown-linux-gnu"
+  #         export UNREAL_ENGINE_LIBCXX_DIR="${UNREAL_ENGINE_DIR}/Engine/Source/ThirdParty/Unix/LibCxx"
+  #         # TODO: Move this to the image instead
+  #         export PATH=$PATH:/usr/local/bin
+  #         cd extern
+  #         cmake -B build -S . -G Ninja -DCMAKE_TOOLCHAIN_FILE="unreal-linux-toolchain.cmake" -DCMAKE_POSITION_INDEPENDENT_CODE=ON -DCMAKE_BUILD_TYPE=Release
+  #         cmake --build build --config Release --target install -j8
+  #         cd ..
+  #         rm -rf extern
+  #     - name: Build plugin
+  #       run: |
+  #         sed -i 's/\"EngineVersion\": \"5.0.0\"/\"EngineVersion\": \"5.3.0\"/g' CesiumForUnreal.uplugin
+  #         export LINUX_MULTIARCH_ROOT="/opt/ue53/Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v22_clang-16.0.6-centos7/"
+  #         cd /opt/ue53/Engine/Build/BatchFiles
+  #         # UnrealBuildTool writes to write to ~/.config and loses its mind if it doesn't exist. So create it.
+  #         # TODO: move this to the image instead
+  #         mkdir -p ~/.config
+  #         ./RunUAT.sh BuildPlugin -Plugin="$GITHUB_WORKSPACE/CesiumForUnreal.uplugin" -Package="$GITHUB_WORKSPACE/packages/CesiumForUnreal" -CreateSubFolder -TargetPlatforms=Linux
+  #     - name: Fix RPATH
+  #       run: |
+  #         sudo yum install -y patchelf
+  #         cd $GITHUB_WORKSPACE/packages/CesiumForUnreal/Binaries/Linux
+  #         patchelf --print-rpath libUnrealEditor-CesiumRuntime.so
+  #         export UPDATED_RPATH=`patchelf --print-rpath libUnrealEditor-CesiumRuntime.so | sed 's/${ORIGIN}[^:]*\/SunPosition\/Binaries\/Linux/${ORIGIN}\/..\/..\/..\/..\/Runtime\/SunPosition\/Binaries\/Linux/'`
+  #         patchelf --force-rpath --set-rpath "$UPDATED_RPATH" libUnrealEditor-CesiumRuntime.so
+  #     - name: Publish plugin package artifact
+  #       if: ${{ success() }}
+  #       uses: actions/upload-artifact@v3
+  #       with:
+  #         name: ${{ env.BUILD_CESIUM_UNREAL_PACKAGE_NAME}}
+  #         path: packages
+  # macOS53:
+  #   runs-on: macos-12
+  #   env:
+  #     AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
+  #     AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+  #     AWS_REGION: us-east-1
+  #   steps:
+  #     - name: Get Unreal Engine
+  #       run: |
+  #         aws s3 cp s3://cesium-unreal-engine/UE_53_macOS.zip .
+  #         unzip -q UE_53_macOS.zip -d $HOME
+  #         rm UE_53_macOS.zip
+  #     - name: Check out repository code
+  #       uses: actions/checkout@v3
+  #       with:
+  #         submodules: recursive
+  #         fetch-depth: 0 # so that `git describe` works.
+  #     - name: Set environment variables
+  #       run: |
+  #         export CESIUM_UNREAL_VERSION=$(git describe)
+  #         export BUILD_CESIUM_UNREAL_PACKAGE_NAME="CesiumForUnreal-53-macos-${CESIUM_UNREAL_VERSION}"
+  #         # Make these available to subsequent steps
+  #         echo "CESIUM_UNREAL_VERSION=${CESIUM_UNREAL_VERSION}" >> $GITHUB_ENV
+  #         echo "BUILD_CESIUM_UNREAL_PACKAGE_NAME=${BUILD_CESIUM_UNREAL_PACKAGE_NAME}" >> $GITHUB_ENV
+  #     - name: Install nasm
+  #       uses: ilammy/setup-nasm@v1.4.0
+  #     - name: Build cesium-native
+  #       run: |
+  #         mkdir -p extern/build
+  #         cd extern/build
+  #         INSTALL_LIBDIR=`cmake .. -LA | grep CMAKE_INSTALL_LIBDIR`
+  #         INSTALL_LIBDIR=${INSTALL_LIBDIR##CMAKE_INSTALL_LIBDIR:PATH=}
+  #         cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_OSX_DEPLOYMENT_TARGET=10.15 -DCMAKE_OSX_ARCHITECTURES=arm64
+  #         cmake --build . -j4 --target install
+  #         mv $INSTALL_LIBDIR ${INSTALL_LIBDIR}-silicon
+  #         cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_OSX_DEPLOYMENT_TARGET=10.15 -DCMAKE_OSX_ARCHITECTURES=x86_64
+  #         cmake --build . -j4 --target install
+  #         for f in ${INSTALL_LIBDIR}/*.a
+  #         do
+  #           lipo -create -output $f ${INSTALL_LIBDIR}-silicon/$(basename -- $f) $f
+  #         done
+  #         rm -r -f ${INSTALL_LIBDIR}-silicon
+  #         cd ../..
+  #         rm -rf extern
+  #     - name: Build plugin
+  #       run: |
+  #         sed -i '' 's/\"EngineVersion\": \"5.0.0\"/\"EngineVersion\": \"5.3.0\"/g' CesiumForUnreal.uplugin
+  #         export UNREAL_ENGINE_DIR=$HOME/UE_5.3
+  #         cd $UNREAL_ENGINE_DIR/Engine/Build/BatchFiles
+  #         ./RunUAT.sh BuildPlugin -Plugin="$GITHUB_WORKSPACE/CesiumForUnreal.uplugin" -Package="$GITHUB_WORKSPACE/packages/CesiumForUnreal" -CreateSubFolder -TargetPlatforms=Mac
+  #     - name: Publish plugin package artifact
+  #       if: ${{ success() }}
+  #       uses: actions/upload-artifact@v3
+  #       with:
+  #         name: ${{ env.BUILD_CESIUM_UNREAL_PACKAGE_NAME}}
+  #         path: packages
+  # iOS53:
+  #   runs-on: macos-13
+  #   env:
+  #     AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
+  #     AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+  #     AWS_REGION: us-east-1
+  #   steps:
+  #     - name: Get Unreal Engine
+  #       run: |
+  #         aws s3 cp s3://cesium-unreal-engine/UE_53_macOS.zip .
+  #         unzip -q UE_53_macOS.zip -d $HOME
+  #         rm UE_53_macOS.zip
+  #     - name: Check out repository code
+  #       uses: actions/checkout@v3
+  #       with:
+  #         submodules: recursive
+  #         fetch-depth: 0 # so that `git describe` works.
+  #     - name: Set environment variables
+  #       run: |
+  #         export CESIUM_UNREAL_VERSION=$(git describe)
+  #         export BUILD_CESIUM_UNREAL_PACKAGE_NAME="CesiumForUnreal-53-ios-${CESIUM_UNREAL_VERSION}"
+  #         # Make these available to subsequent steps
+  #         echo "CESIUM_UNREAL_VERSION=${CESIUM_UNREAL_VERSION}" >> $GITHUB_ENV
+  #         echo "BUILD_CESIUM_UNREAL_PACKAGE_NAME=${BUILD_CESIUM_UNREAL_PACKAGE_NAME}" >> $GITHUB_ENV
+  #     - name: Install nasm
+  #       uses: ilammy/setup-nasm@v1.4.0
+  #     - name: Build cesium-native
+  #       run: |
+  #         mkdir -p extern/build-ios
+  #         cd extern
+  #         cmake -B build-ios -S . -GXcode -DCMAKE_SYSTEM_NAME=iOS -DCMAKE_OSX_ARCHITECTURES=arm64 -DCMAKE_POSITION_INDEPENDENT_CODE=ON -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS="-fembed-bitcode" -DCMAKE_C_FLAGS="-fembed-bitcode"
+  #         cmake --build build-ios -j 4 --target install --config Release -- -quiet # XCode output maxes out Travis log - Need to make it quiet
+  #         cd ..
+  #         rm -rf extern
+  #     - name: Build plugin
+  #       run: |
+  #         sed -i '' 's/\"EngineVersion\": \"5.0.0\"/\"EngineVersion\": \"5.3.0\"/g' CesiumForUnreal.uplugin
+  #         export UNREAL_ENGINE_DIR=$HOME/UE_5.3
+  #         cd $UNREAL_ENGINE_DIR/Engine/Build/BatchFiles
+  #         ./RunUAT.sh BuildPlugin -Plugin="$GITHUB_WORKSPACE/CesiumForUnreal.uplugin" -Package="$GITHUB_WORKSPACE/packages/CesiumForUnreal" -CreateSubFolder -TargetPlatforms=iOS -NoHostPlatform
+  #     - name: Publish plugin package artifact
+  #       if: ${{ success() }}
+  #       uses: actions/upload-artifact@v3
+  #       with:
+  #         name: ${{ env.BUILD_CESIUM_UNREAL_PACKAGE_NAME}}
+  #         path: packages
+  Combine53:
+    runs-on: ubuntu-latest
+    needs: [Windows53, Android53] # , Linux53, MacOS53, iOS53
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0 # so that `git describe` works.
+      - name: Set environment variables
+        run: |
+          export CESIUM_UNREAL_VERSION=$(git describe)
+          export BUILD_CESIUM_UNREAL_PACKAGE_NAME="CesiumForUnreal-53-${CESIUM_UNREAL_VERSION}"
+          # Make these available to subsequent steps
+          echo "CESIUM_UNREAL_VERSION=$CESIUM_UNREAL_VERSION" >> $GITHUB_ENV
+          echo "BUILD_CESIUM_UNREAL_PACKAGE_NAME=$BUILD_CESIUM_UNREAL_PACKAGE_NAME" >> $GITHUB_ENV
+      # - name: Download iOS build
+      #   uses: actions/download-artifact@v3
+      #   with:
+      #     name: CesiumForUnreal-53-ios-${{ env.CESIUM_UNREAL_VERSION}}
+      #     path: combine
+      # - name: Download macOS build
+      #   uses: actions/download-artifact@v3
+      #   with:
+      #     name: CesiumForUnreal-53-macos-${{ env.CESIUM_UNREAL_VERSION}}
+      #     path: combine
+      - name: Download Android build
+        uses: actions/download-artifact@v3
+        with:
+          name: CesiumForUnreal-53-android-${{ env.CESIUM_UNREAL_VERSION}}
+          path: combine
+      # - name: Download Linux build
+      #   uses: actions/download-artifact@v3
+      #   with:
+      #     name: CesiumForUnreal-53-linux-${{ env.CESIUM_UNREAL_VERSION}}
+      #     path: combine
+      - name: Download Windows build
+        uses: actions/download-artifact@v3
+        with:
+          name: CesiumForUnreal-53-windows-${{ env.CESIUM_UNREAL_VERSION}}
+          path: combine
+      - name: Unreal Marketplace Workaround
+        run: |
+          # The UE Marketplace deletes our Intermediates directory and fails to produces new
+          # intermediates for the Linux platform. The Marketplace team has suggested we copy
+          # them to the LinuxIntermediate directory instead, as a workaround. Users still have
+          # to move these files to the correct place manually, though, in order for Linux builds
+          # to succeed.
+          mkdir -p combine/CesiumForUnreal/LinuxIntermediate/Build/Linux
+          cp -r combine/CesiumForUnreal/Intermediate/Build/Linux/* combine/CesiumForUnreal/LinuxIntermediate/Build/Linux
+      - name: Publish combined package artifact
+        if: ${{ success() }}
+        uses: actions/upload-artifact@v3
+        with:
+          name: ${{ env.BUILD_CESIUM_UNREAL_PACKAGE_NAME}}
+          path: combine
+  TestPackage53:
+    needs: [Combine53]
+    uses: ./.github/workflows/testPackageOnWindows.yml
+    with:
+      unreal-engine-association: "5.3"
+      unreal-runner-label: "unreal-53"
+      unreal-binaries-path: "C:/Program Files/Epic Games/UE_5.3/Engine/Binaries/Win64"
+      unreal-batch-files-path: "C:/Program Files/Epic Games/UE_5.3/Engine/Build/BatchFiles"
+      unreal-plugins-path: "C:/Program Files/Epic Games/UE_5.3/Engine/Plugins"
+      test-package-base-name: "CesiumForUnreal-53"
+    secrets: inherit