diff --git a/.github/workflows/verify-on-ubuntu.yml b/.github/workflows/verify-on-ubuntu1804.yml
similarity index 94%
rename from .github/workflows/verify-on-ubuntu.yml
rename to .github/workflows/verify-on-ubuntu1804.yml
index 2400e1e..3dc2711 100644
--- a/.github/workflows/verify-on-ubuntu.yml
+++ b/.github/workflows/verify-on-ubuntu1804.yml
@@ -1,6 +1,6 @@
 # https://help.github.com/en/articles/workflow-syntax-for-github-actions
 
-name: Ubuntu
+name: Ubuntu 18.04
 
 on:
 - push
@@ -9,7 +9,7 @@ on:
 jobs:
   ssh:
     name: Connect to github.com
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
     - name: Checkout source codes
       uses: actions/checkout@v2
@@ -24,7 +24,7 @@ jobs:
       run: git clone git@github.com:shimataro/ssh-key-action.git tmp
   ssh-with-name:
     name: Connect to github.com with name and config
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
     - name: Checkout source codes
       uses: actions/checkout@v2
diff --git a/.github/workflows/verify-on-ubuntu2004.yml b/.github/workflows/verify-on-ubuntu2004.yml
new file mode 100644
index 0000000..5ae7307
--- /dev/null
+++ b/.github/workflows/verify-on-ubuntu2004.yml
@@ -0,0 +1,45 @@
+# https://help.github.com/en/articles/workflow-syntax-for-github-actions
+
+name: Ubuntu 20.04
+
+on:
+- push
+- pull_request
+
+jobs:
+  ssh:
+    name: Connect to github.com
+    runs-on: ubuntu-20.04
+    steps:
+    - name: Checkout source codes
+      uses: actions/checkout@v2
+    - name: Install SSH key
+      uses: ./.
+      with:
+        key: ${{ secrets.SSH_KEY }}
+        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+    - 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-with-name:
+    name: Connect to github.com with name and config
+    runs-on: ubuntu-20.04
+    steps:
+    - name: Checkout source codes
+      uses: actions/checkout@v2
+    - name: Install SSH key
+      uses: ./.
+      with:
+        key: ${{ secrets.SSH_KEY }}
+        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+        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 -l ~/.ssh
+    - name: git clone through SSH
+      run: git clone github:shimataro/ssh-key-action.git tmp