diff --git a/.codesandbox/ci.json b/.codesandbox/ci.json
index f866879a..bf3237bb 100644
--- a/.codesandbox/ci.json
+++ b/.codesandbox/ci.json
@@ -1,4 +1,5 @@
 {
+  "installCommand": "install:csb",
   "sandboxes": ["new", "github/kentcdodds/react-testing-library-examples"],
   "node": "12"
 }
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 67b71c24..b2e7dc4c 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -2,7 +2,9 @@ name: validate
 on:
   push:
     branches:
-      - '+([0-9])?(.{+([0-9]),x}).x'
+      # Match SemVer major release branches
+      # e.g. "12.x" or "8.x"
+      - '[0-9]+.x'
       - 'main'
       - 'next'
       - 'next-major'
@@ -58,8 +60,7 @@ jobs:
     runs-on: ubuntu-latest
     if:
       ${{ github.repository == 'testing-library/react-testing-library' &&
-      contains('refs/heads/main,refs/heads/beta,refs/heads/next,refs/heads/alpha',
-      github.ref) && github.event_name == 'push' }}
+      github.event_name == 'push' }}
     steps:
       - name: 🛑 Cancel Previous Runs
         uses: styfle/cancel-workflow-action@0.9.0
diff --git a/package.json b/package.json
index 73d39de8..47b5ad06 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,7 @@
     "build:bundle:pure": "dotenv -e .bundle.main.env -e .bundle.pure.env kcd-scripts build -- --bundle --no-clean",
     "build:main": "kcd-scripts build --no-clean",
     "format": "kcd-scripts format",
+    "install:csb": "npm install",
     "lint": "kcd-scripts lint",
     "setup": "npm install && npm run validate -s",
     "test": "kcd-scripts test",
@@ -46,7 +47,7 @@
   "dependencies": {
     "@babel/runtime": "^7.12.5",
     "@testing-library/dom": "^8.0.0",
-    "@types/react-dom": "*"
+    "@types/react-dom": "<18.0.0"
   },
   "devDependencies": {
     "@testing-library/jest-dom": "^5.11.6",
@@ -59,8 +60,8 @@
     "typescript": "^4.1.2"
   },
   "peerDependencies": {
-    "react": "*",
-    "react-dom": "*"
+    "react": "<18.0.0",
+    "react-dom": "<18.0.0"
   },
   "eslintConfig": {
     "extends": "./node_modules/kcd-scripts/eslint.js",