diff --git a/.github/workflows/Build.yml b/.github/workflows/Build.yml
index 3ec300a3..9791fd2a 100644
--- a/.github/workflows/Build.yml
+++ b/.github/workflows/Build.yml
@@ -31,7 +31,7 @@ jobs:
           bundle install --jobs=4
       - name: Update index
         run: |
-          bundle exec ruby Scripts/update-index.rb --pod "${{ inputs.pod }}" --version "${{ inputs.version }}" --action "${{ inputs.action }}" --path "${{ inputs.path }}"
+          bundle exec ruby Scripts/update-index.rb --sha "${{ inputs.sha }}"
 
       # - name: Deploy to Pages
       #   if: github.event_name == 'schedule'
@@ -58,22 +58,10 @@ jobs:
 on:
   workflow_dispatch:
     inputs:
-      pod:
-        description: 'The pod to be updated'
+      sha:
+        description: 'Spec repo commit SHA'
         required: true
         type: string
-      version:
-        description: 'The version of the pod to update'
-        required: true
-        type: string
-      podspec_path:
-        description: 'The path to the podspec in the spec repo'
-        required: true
-        type: string
-      action:
-        description: 'The action to perform'
-        required: true
-        type: string  
   # repository_dispatch:
   #   types: 
   #     - cronjob
diff --git a/Scripts/update-index.rb b/Scripts/update-index.rb
index 50b6681d..a0d32cd1 100644
--- a/Scripts/update-index.rb
+++ b/Scripts/update-index.rb
@@ -7,10 +7,7 @@
 
 options = {}
 OptionParser.new do |opts|
-  opts.on("--pod POD_NAME", "The name of the Pod to update", String)
-  opts.on("--version POD_VERSION", "The version of the Pod to update", String)
-  opts.on("--action ACTION", "The action to perform", String)
-  opts.on("--path PODSPEC_PATH", "The relative path to the podspec in the master spec repo", String)
+  opts.on("--sha SHA", "SHA of the latest commit to the Specs repo", String)
 
   opts.on("-h", "--help", "Prints this help") do
     puts opts
@@ -21,3 +18,15 @@
 STDERR.puts 'CDN Indexer v3'
 
 puts "Options: #{options.inspect}"
+
+exit 1 unless (sha = options[:sha])
+
+response = REST.get("https://api.github.com/repos/CocoaPods/Specs/commits/#{sha}")
+if !response.ok?
+  puts "Failed to fetch commit: #{sha}"
+  puts response.body
+  exit 1
+end
+
+commit_info = JSON.parse(response.body)
+pp commit_info