diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c7c0c4a..48059a4 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -6,6 +6,7 @@ name: PR Build
 on:
   push:
   pull_request:
+    branches: ["master"]
 
 jobs:
   build:
@@ -13,11 +14,11 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [20.x]
+        node-version: [16.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v3
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3
         with: