diff --git a/.github/workflows/container.yml b/.github/workflows/container.yml
index 0e12659..e902a8d 100644
--- a/.github/workflows/container.yml
+++ b/.github/workflows/container.yml
@@ -8,6 +8,13 @@ on:
         description: 'Git ref (e.g. branch or tag) of Penumbra repo for building'
         default: "main"
         required: true
+  # Support triggering builds from penumbra-zone/penumbra CI.
+  repository_dispatch:
+    inputs:
+      penumbra_version:
+        description: 'Git ref (e.g. branch or tag) of Penumbra repo for building'
+        default: "main"
+        required: true
   push:
     branches:
       - main