diff --git a/.github/workflows/verify-on-macos.yml b/.github/workflows/verify-on-macos.yml
index 274b1e1..eb17706 100644
--- a/.github/workflows/verify-on-macos.yml
+++ b/.github/workflows/verify-on-macos.yml
@@ -1,6 +1,6 @@
 # https://help.github.com/en/articles/workflow-syntax-for-github-actions
 
-name: macOS
+name: macOS Catalina
 
 on:
 - push
@@ -9,7 +9,7 @@ on:
 jobs:
   ssh:
     name: Connect to github.com
-    runs-on: macos-latest
+    runs-on: macos-10.15
     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: macos-latest
+    runs-on: macos-10.15
     steps:
     - name: Checkout source codes
       uses: actions/checkout@v2