diff --git a/README.md b/README.md
index 32ce894..7bdeafc 100644
--- a/README.md
+++ b/README.md
@@ -2,13 +2,15 @@
 
 > In-memory [`abstract-leveldown`] store for Node.js and browsers.
 
-[![level badge][level-badge]](https://github.com/level/awesome)
-[![npm](https://img.shields.io/npm/v/memdown.svg)](https://www.npmjs.com/package/memdown)
-![Node version](https://img.shields.io/node/v/memdown.svg)
-[![Travis](https://secure.travis-ci.org/Level/memdown.svg?branch=master)](http://travis-ci.org/Level/memdown)
+[![level badge][level-badge]](https://github.com/Level/awesome)
+[![npm](https://img.shields.io/npm/v/memdown.svg?label=&logo=npm)](https://www.npmjs.com/package/memdown)
+[![Node version](https://img.shields.io/node/v/memdown.svg)](https://www.npmjs.com/package/memdown)
+[![Travis](https://img.shields.io/travis/Level/memdown.svg?logo=travis&label=)](https://travis-ci.org/Level/memdown)
 [![Coverage Status](https://coveralls.io/repos/Level/memdown/badge.svg?branch=master&service=github)](https://coveralls.io/github/Level/memdown?branch=master)
 [![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
-[![npm](https://img.shields.io/npm/dm/memdown.svg)](https://www.npmjs.com/package/memdown)
+[![npm](https://img.shields.io/npm/dm/memdown.svg?label=dl)](https://www.npmjs.com/package/memdown)
+[![Backers on Open Collective](https://opencollective.com/level/backers/badge.svg?color=orange)](#backers)
+[![Sponsors on Open Collective](https://opencollective.com/level/sponsors/badge.svg?color=orange)](#sponsors)
 
 ## Example
 
@@ -141,6 +143,18 @@ Cross-browser Testing Platform and Open Source ♥ Provided by [Sauce Labs](http
 
 [![Sauce Labs logo](./sauce-labs.svg)](https://saucelabs.com)
 
+## Donate
+
+To sustain [`Level`](https://github.com/Level) and its activities, become a backer or sponsor on [Open Collective](https://opencollective.com/level). Your logo or avatar will be displayed on our 28+ [GitHub repositories](https://github.com/Level), [npm](https://www.npmjs.com/) packages and (soon) [our website](http://leveldb.org). 💖
+
+### Backers
+
+[![Open Collective backers](https://opencollective.com/level/backers.svg?width=890)](https://opencollective.com/level)
+
+### Sponsors
+
+[![Open Collective sponsors](https://opencollective.com/level/sponsors.svg?width=890)](https://opencollective.com/level)
+
 ## License
 
 [MIT](LICENSE.md) © 2013-present Rod Vagg and [Contributors](CONTRIBUTORS.md).
diff --git a/package.json b/package.json
index 4a2a5a4..f9bcac7 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,9 @@
     "test-browsers": "airtap --loopback airtap.local --coverage test.js",
     "test-browser-local": "airtap --coverage --local test.js",
     "coverage": "nyc report --reporter=text-lcov | coveralls",
-    "hallmark": "hallmark --fix"
+    "hallmark": "hallmark --fix",
+    "dependency-check": "dependency-check . immediate*.js test.js",
+    "prepublishOnly": "npm run dependency-check"
   },
   "files": [
     "memdown.js",
@@ -36,6 +38,7 @@
   "devDependencies": {
     "airtap": "^2.0.0",
     "coveralls": "^3.0.2",
+    "dependency-check": "^3.3.0",
     "hallmark": "^0.1.0",
     "level-community": "^3.0.0",
     "nyc": "^12.0.2",