diff --git a/.github/workflows/verify-on-macos.yml b/.github/workflows/verify-on-macos.yml
index 5363970..145ac2e 100644
--- a/.github/workflows/verify-on-macos.yml
+++ b/.github/workflows/verify-on-macos.yml
@@ -68,11 +68,34 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PKCS8 }}
-        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-pkcs8-bitbucket:
+    name: Connect to bitbucket.org (PKCS8 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_PKCS8 }}
+        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-rfc4716:
     name: Connect to github.com (RFC4716 format)
     runs-on: ${{ matrix.os }}
@@ -90,11 +113,35 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_RFC4716 }}
-        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-rfc4716-bitbucket:
+    name: Connect to bitbucket.org (RFC4716 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_RFC4716 }}
+        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-with-name:
     name: Connect to github.com with name and config
     runs-on: ${{ matrix.os }}
@@ -112,7 +159,7 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+        known_hosts: unnecessary
         name: ssh_key_name # optional
         config: | # optional
           Host github
@@ -141,12 +188,12 @@ jobs:
       uses: ./.
       with:
         key: "dummy" # replaced
-        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+        known_hosts: unnecessary
     - name: Install SSH key (replace)
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+        known_hosts: unnecessary
         if_key_exists: replace
     - name: print created files
       run: ls -l ~/.ssh
@@ -169,7 +216,7 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+        known_hosts: unnecessary
         if_key_exists: replace
     - name: print created files
       run: ls -l ~/.ssh
@@ -193,12 +240,12 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+        known_hosts: unnecessary
     - name: Install SSH key (replace)
       uses: ./.
       with:
         key: "dummy" # ignored
-        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+        known_hosts: unnecessary
         if_key_exists: ignore
     - name: print created files
       run: ls -l ~/.ssh
@@ -221,7 +268,7 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+        known_hosts: unnecessary
         if_key_exists: ignore
     - name: print created files
       run: ls -l ~/.ssh
@@ -245,12 +292,12 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+        known_hosts: unnecessary
     - name: Install SSH key (replace)
       uses: ./.
       with:
         key: "dummy" # ignored
-        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+        known_hosts: unnecessary
         if_key_exists: fail
       continue-on-error: true
     - name: print created files
@@ -274,7 +321,7 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+        known_hosts: unnecessary
         if_key_exists: fail
     - name: print created files
       run: ls -l ~/.ssh