diff --git a/action.yml b/action.yml
index 0d20de5..e45ccb2 100644
--- a/action.yml
+++ b/action.yml
@@ -6,6 +6,10 @@ inputs:
     description: "Additional packages to install"
     required: false
     default: ''
+  branch:
+    description: "Alpine Linux branch"
+    required: false
+    default: 3.21
 runs:
   using: "node20"
   main: "index.js"
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