diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3b9c9fe..8cc19ac 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -20,6 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: technote-space/auto-cancel-redundant-workflow@v1
       - uses: actions/setup-java@v1
         with:
           java-version: '12.x'
diff --git a/.github/workflows/build_nightly.yml b/.github/workflows/build_nightly.yml
index 59bde38..d591a42 100644
--- a/.github/workflows/build_nightly.yml
+++ b/.github/workflows/build_nightly.yml
@@ -20,6 +20,7 @@ jobs:
     runs-on: [macos-latest]
     steps:
       - uses: actions/checkout@v2
+      - uses: technote-space/auto-cancel-redundant-workflow@v1
       - name: Install RubyGems
         run: |
           cd ios