diff --git a/action.yml b/action.yml
index 96b8abd..184411f 100644
--- a/action.yml
+++ b/action.yml
@@ -12,8 +12,8 @@ github-token:
 
 inputs:
   base_url:
-    description: "base api url. default to: https://api.github.com"
-    default: "https://api.github.com"
+    description: "base api url. default to: ${{ env.GITHUB_API_URL }}"
+    default: "${{ env.GITHUB_API_URL }}"
     required: false
   header:
     description: "Header to determine if the comment is to be updated, not shown on screen. It can be used when you want to add multiple comments independently at the same time."