diff --git a/.github/workflows/code-cov.yml b/.github/workflows/code-cov.yml
index 80c6a37..f15ccfa 100644
--- a/.github/workflows/code-cov.yml
+++ b/.github/workflows/code-cov.yml
@@ -14,14 +14,15 @@ jobs:
     steps:
       - name: ccache
         uses: hendrikmuhs/ccache-action@v1
-      - name: C++ Setting
+      - name: Basic Setting
         run: |
-          sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
-          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
-          sudo add-apt-repository -y "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-${{matrix.clang-version}} main"
           sudo apt-get update
-          sudo apt-get install -yq clang-${{matrix.clang-version}} libc++-dev libc++abi-dev libstdc++-${{matrix.clang-version}}-dev build-essential cmake
-          sudo apt-get install -yq libllvm${{matrix.clang-version}} llvm-${{matrix.clang-version}} llvm-${{matrix.clang-version}}-dev llvm-${{matrix.clang-version}}-runtime
+          sudo apt-get install -yq build-essential cmake
+      - name: Install LLVM
+        run: |
+          wget https://apt.llvm.org/llvm.sh
+          chmod +x ./llvm.sh
+          sudo ./llvm.sh ${{matrix.clang-version}}
       - name: Compiler Setting
         run: |
           echo "CC=clang-${{matrix.clang-version}}" >> $GITHUB_ENV
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 903512a..ce24aa6 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -48,13 +48,15 @@ jobs:
     steps:
       - name: ccache
         uses: hendrikmuhs/ccache-action@v1
-      - name: C++ Setting
+      - name: Basic Setting
         run: |
-          sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
-          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
-          sudo add-apt-repository -y "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-${{matrix.clang-version}} main"
           sudo apt-get update
-          sudo apt-get install -yq clang-${{matrix.clang-version}} libc++-dev libc++abi-dev libstdc++-${{matrix.clang-version}}-dev build-essential cmake
+          sudo apt-get install -yq build-essential cmake
+      - name: Install LLVM
+        run: |
+          wget https://apt.llvm.org/llvm.sh
+          chmod +x ./llvm.sh
+          sudo ./llvm.sh ${{matrix.clang-version}}
       - name: Compiler Setting
         run: |
           echo "CC=clang-${{matrix.clang-version}}" >> $GITHUB_ENV