diff --git a/.github/workflows/abicheck.yml b/.github/workflows/abicheck.yml
index 48f39b25..992f2811 100644
--- a/.github/workflows/abicheck.yml
+++ b/.github/workflows/abicheck.yml
@@ -17,11 +17,11 @@ jobs:
           pip3 install wheel
           pip3 install meson
       - name: checkout merge ref
-        uses: actions/checkout@master
+        uses: actions/checkout@main
         with:
           path: merge.src
       - name: checkout base ref
-        uses: actions/checkout@master
+        uses: actions/checkout@main
         with:
           path: base.src
           ref: ${{ github.base_ref }}
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 17da255d..4558a244 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -4,7 +4,7 @@ jobs:
   install:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@master
+    - uses: actions/checkout@main
     - name: install
       uses: irssi-import/actions-irssi/check-irssi@master
       with:
diff --git a/.github/workflows/clangformat.yml b/.github/workflows/clangformat.yml
index 71f2ffed..070227bf 100644
--- a/.github/workflows/clangformat.yml
+++ b/.github/workflows/clangformat.yml
@@ -4,7 +4,7 @@ jobs:
   check-clang-format:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@main
       - name: fetch target ref
         run:
           |