diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 48b9d62bb9b7..971053006b0e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -36,61 +36,8 @@ concurrency:
 
 jobs:
   MacOS:
-    runs-on: macOS-latest
+    runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: 'recursive'
-    - name: Set up environment
-      uses: ./.github/actions/setup
-    - name: Conda Build
-      shell: bash -l {0}
-      run: >-
-        conda build --output-folder=conda/pkg  conda/recipe &&
-        conda install tvm -c ./conda/pkg
-    - name: Build iOS RPC
+    - name: test
       run: |
-        IOS_VERSION="14.0"
-        CMAKE_FLAGS="-DCMAKE_BUILD_TYPE=Release \
-                     -DCMAKE_SYSTEM_NAME=iOS \
-                     -DCMAKE_SYSTEM_VERSION=${IOS_VERSION} \
-                     -DCMAKE_OSX_SYSROOT=iphonesimulator \
-                     -DCMAKE_OSX_ARCHITECTURES=x86_64 \
-                     -DCMAKE_OSX_DEPLOYMENT_TARGET=14.0 \
-                     -DCMAKE_BUILD_WITH_INSTALL_NAME_DIR=ON \
-                     -DUSE_IOS_RPC=ON"
-
-        mkdir build-ios-simulator
-        cd build-ios-simulator
-        cmake .. ${CMAKE_FLAGS}
-        cmake --build . --target ios_rpc
-    - name: Test
-      shell: bash -l {0}
-      run: >-
-        python -m pytest -v tests/python/all-platform-minimal-test
-    - name: Test iOS RPC
-      shell: bash -l {0}
-      run: >-
-        python -m pip install tornado psutil cloudpickle &&
-        export PYTHONPATH=tests/python/contrib:${PYTHONPATH} &&
-        export BUNDLE_ID=org.apache.tvmrpc &&
-        export BUNDLE_PATH=build-ios-simulator/apps/ios_rpc/ios_rpc/src/ios_rpc-build/Release-iphonesimulator/tvmrpc.app &&
-        python -m pytest -v tests/python/contrib/test_rpc_server_device.py
-
-  Windows:
-    runs-on: windows-2019
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: 'recursive'
-    - name: Set up environment
-      uses: ./.github/actions/setup
-    - name: Conda Build
-      shell: cmd /C call {0}
-      run: >-
-        conda build --output-folder=conda/pkg conda/recipe &&
-        conda install tvm -c ./conda/pkg
-    - name: Test
-      shell: cmd /C call {0}
-      run: >-
-        python -m pytest -v tests/python/all-platform-minimal-test
+        echo hi