diff --git a/action.yml b/action.yml
index 327a264..d4c20d5 100644
--- a/action.yml
+++ b/action.yml
@@ -4,11 +4,15 @@ inputs:
   sourcepkg:
     description: 'Filename of the source package'
     required: true
+  branch:
+    description: 'Filename of the source package'
+    required: false
+    default: 'latest'
 outputs:
   binarypkg:
     description: 'Filename of the wasm binary package (if successful)'
 runs:
   using: 'docker'
-  image: 'docker://ghcr.io/r-universe-org/build-wasm'
+  image: docker://ghcr.io/r-universe-org/build-wasm:${{ inputs.branch }}
   env:
     SOURCEPKG: ${{ inputs.sourcepkg }}