diff --git a/.github/workflows/npm_publish.yaml b/.github/workflows/npm_publish.yaml
index c6f1c13..8d28cf1 100644
--- a/.github/workflows/npm_publish.yaml
+++ b/.github/workflows/npm_publish.yaml
@@ -4,6 +4,8 @@ on:
   pull_request:
     types: [ closed ]
     branches: [ "main" ]
+  # For a merge that went in without the Release label.
+  workflow_dispatch:
 
 permissions:
   id-token: write
@@ -11,13 +13,15 @@ permissions:
 
 jobs:
   publish-npm:
-    if: github.event.pull_request.merged == true && contains(github.event.pull_request.labels.*.name, 'Release')
+    if: >-
+      (github.event_name == 'workflow_dispatch' && github.ref == 'refs/heads/main') ||
+      (github.event.pull_request.merged == true && contains(github.event.pull_request.labels.*.name, 'Release'))
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v4
         with:
-          ref: ${{ github.event.pull_request.merge_commit_sha }}
+          ref: ${{ github.event.pull_request.merge_commit_sha || github.sha }}
 
       - uses: actions/setup-node@v4
         with: