diff --git a/.github/workflows/verify-on-macos.yml b/.github/workflows/verify-on-macos.yml
index b631750..5363970 100644
--- a/.github/workflows/verify-on-macos.yml
+++ b/.github/workflows/verify-on-macos.yml
@@ -23,11 +23,34 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+        known_hosts: unnecessary
     - name: print created files
       run: ls -l ~/.ssh
     - name: git clone through SSH
       run: git clone git@github.com:shimataro/ssh-key-action.git tmp
+  ssh-pem-bitbucket:
+    name: Connect to bitbucket.org (PEM format)
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+        - macos-10.15
+        - macos-11
+        - macos-12
+    steps:
+    - name: Checkout source codes
+      uses: actions/checkout@v2
+    - name: Install SSH key
+      uses: ./.
+      with:
+        key: ${{ secrets.SSH_KEY_PEM }}
+        known_hosts: |
+          bitbucket.org ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAubiN81eDcafrgMeLzaFPsw2kNvEcqTKl/VqLat/MaB33pZy0y3rJZtnqwR2qOOvbwKZYKiEO1O6VqNEBxKvJJelCq0dTXWT5pbO2gDXC6h6QDXCaHo6pOHGPUy+YBaGQRGuSusMEASYiWunYN0vCAI8QaXnWMXNMdFP3jHAJH0eDsoiGnLPBlBp4TNm6rYI74nMzgz3B9IikW4WVK+dc8KZJZWYjAuORU3jc1c/NPskD2ASinf8v3xnfXeukU0sJ5N6m5E8VLjObPEO+mN2t/FZTMZLiFqPWc/ALSqnMnnhwrNi2rbfg/rd/IpL8Le3pSBne8+seeFVBoGqzHM9yXw==
+    - name: print created files
+      run: ls -l ~/.ssh
+    - name: git clone through SSH
+      run: git clone git@bitbucket.org:shimataro999/ssh-test.git tmp
   ssh-pkcs8:
     name: Connect to github.com (PKCS8 format)
     runs-on: ${{ matrix.os }}
@@ -257,26 +280,3 @@ jobs:
       run: ls -l ~/.ssh
     - name: git clone through SSH
       run: git clone git@github.com:shimataro/ssh-key-action.git tmp
-
-  known_hosts-unnecessary:
-    name: without known_hosts file
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os:
-        - macos-10.15
-        - macos-11
-        - macos-12
-    steps:
-    - name: Checkout source codes
-      uses: actions/checkout@v2
-    - name: Install SSH key
-      uses: ./.
-      with:
-        key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: unnecessary
-    - name: print created files
-      run: ls -l ~/.ssh
-    - name: git clone through SSH # can clone because key of "github.com" always set to "known_hosts"
-      run: git clone git@github.com:shimataro/ssh-key-action.git tmp