diff --git a/.github/workflows/verify.yml.bak b/.github/workflows/verify.yml.bak
deleted file mode 100644
index 3088b2c..0000000
--- a/.github/workflows/verify.yml.bak
+++ /dev/null
@@ -1,54 +0,0 @@
-# https://help.github.com/en/articles/workflow-syntax-for-github-actions
-
-on: push
-name: Connection test
-jobs:
-  ssh:
-    name: Connect to github.com on ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os:
-        - Windows-latest
-        - macOS-latest
-        - Ubuntu-16.04
-        - Ubuntu-latest
-      fail-fast: false
-    steps:
-    - name: Install SSH key
-      uses: shimataro/ssh-key-action@HEAD
-      with:
-        private-key: ${{ secrets.SSH_KEY }}
-        public-key: ${{ secrets.SSH_KEY_PUBLIC }}
-        known-hosts: ${{ secrets.KNOWN_HOSTS }} # optional
-    - name: print created files
-      run: ls ~/.ssh
-    - name: git clone through SSH
-      run: git clone git@github.com:shimataro/ssh-key-action.git tmp
-  ssh-with-name:
-    name: Connect to github.com on ${{ matrix.os }} with name
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os:
-        - Windows-latest
-        - macOS-latest
-        - Ubuntu-latest
-      fail-fast: false
-    steps:
-    - name: Install SSH key
-      uses: shimataro/ssh-key-action@HEAD
-      with:
-        private-key: ${{ secrets.SSH_KEY }}
-        public-key: ${{ secrets.SSH_KEY_PUBLIC }}
-        known-hosts: ${{ secrets.KNOWN_HOSTS }} # optional
-        name: ssh_key_name # optional
-        config: | # optional
-          Host github
-            Hostname github.com
-            User git
-            IdentityFile ~/.ssh/ssh_key_name
-    - name: print created files
-      run: ls ~/.ssh
-    - name: git clone through SSH
-      run: git clone github:shimataro/ssh-key-action.git tmp