diff --git a/action.yml b/action.yml
index 59a1ab789..5cacb2121 100644
--- a/action.yml
+++ b/action.yml
@@ -23,6 +23,9 @@ inputs:
   result-encoding:
     description: Either "string" or "json" (default "json")—how the result will be encoded 
     default: json
+  baseUrl:
+    description: The base URL for the GitHub API service instance 
+    default: https://api.github.com
 outputs:
   result:
     description: The return value of the script, stringified with `JSON.stringify`
diff --git a/src/main.ts b/src/main.ts
index c0668c626..0265e5a3c 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -12,6 +12,7 @@ type Options = {
   log?: Console
   userAgent?: string
   previews?: string[]
+  baseUrl?: string
 }
 
 async function main(): Promise<void> {
@@ -19,11 +20,13 @@ async function main(): Promise<void> {
   const debug = core.getInput('debug')
   const userAgent = core.getInput('user-agent')
   const previews = core.getInput('previews')
+  const baseUrl  = core.getInput('baseUrl')
 
   const opts: Options = {}
   if (debug === 'true') opts.log = console
   if (userAgent != null) opts.userAgent = userAgent
   if (previews != null) opts.previews = previews.split(',')
+  if (baseUrl != null) opts.baseUrl = baseUrl
 
   const github = getOctokit(token, opts)
   const script = core.getInput('script', {required: true})