diff --git a/.github/workflows/issue_comment.yml b/.github/workflows/issue_comment.yml
index 7398d128a..5f8f46081 100644
--- a/.github/workflows/issue_comment.yml
+++ b/.github/workflows/issue_comment.yml
@@ -18,3 +18,5 @@ jobs:
           commands: |
             format
             benchmark
+            rebase
+            rerun
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 6108f714a..6421f0809 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -134,7 +134,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix: ${{ fromJson(needs.matrix_prep.outputs.matrix) }}
-    runs-on: macos-latest
+    runs-on: macos-11
     steps:
       - uses: actions/checkout@v2
         with:
@@ -155,7 +155,7 @@ jobs:
       - name: Download Pre-Built LLVM 10.0.0
         run: python misc/ci_download.py
         env:
-          CI_PLATFORM: macos-latest
+          CI_PLATFORM: macos-11
 
       - name: Create Python Wheel
         run: |
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index a02363def..d64d6e42b 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -227,11 +227,11 @@ jobs:
   build_and_test_cpu_mac:
     name: Build and Test macos (CPU)
     needs: [check_code_format, check_files]
-    timeout-minutes: 60
+    timeout-minutes: 90
     strategy:
       matrix:
         include:
-          - os: macos-latest
+          - os: macos-11
             python: 3.7
             with_cc: OFF
             with_cpp_tests: ON
@@ -265,12 +265,15 @@ jobs:
 
       - name: Build & Install
         run: |
+          brew install llvm@11
+          export CXX=/usr/local/opt/llvm@11/bin/clang++
           if [[ ${{needs.check_files.outputs.run_job}} == false ]]; then
             exit 0
           fi
           mkdir -p sccache_cache
           export PATH=`pwd`/taichi-llvm/bin/:$PATH
           .github/workflows/scripts/unix_build.sh
+          mv ./dist/taichi-0.8.10-cp37-cp37m-macosx_11_0_x86_64.whl ./dist/taichi-0.8.10-cp37-cp37m-macosx_10_15_x86_64.whl
         env:
           TAICHI_CMAKE_ARGS: -DTI_WITH_OPENGL:BOOL=OFF -DTI_WITH_CC:BOOL=${{ matrix.with_cc }} -DTI_WITH_VULKAN:BOOL=OFF -DTI_BUILD_TESTS:BOOL=${{ matrix.with_cpp_tests }} -DCMAKE_C_COMPILER_LAUNCHER=sccache -DCMAKE_CXX_COMPILER_LAUNCHER=sccache
           CXX: clang++