diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 9e81b21c..334948de 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,7 +18,6 @@ jobs:
     - run: npx aegir build
     - run: npx aegir dep-check
     - uses: ipfs/aegir/actions/bundle-size@master
-      name: size
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
   test-node:
@@ -27,7 +26,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest, ubuntu-latest, macos-latest]
-        node: [12, 14]
+        node: [14, 15]
       fail-fast: true
     steps:
       - uses: actions/checkout@v2
@@ -35,22 +34,33 @@ jobs:
         with:
           node-version: ${{ matrix.node }}
       - run: npm install
-      - run: npx nyc --reporter=lcov aegir test -t node -- --bail
+      - run: npx aegir test -t node --bail --cov
       - uses: codecov/codecov-action@v1
   test-chrome:
     needs: check
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: microsoft/playwright-github-action@v1
       - run: npm install
-      - run: npx aegir test -t browser -t webworker --bail
+      - run: npx aegir test -t browser -t webworker --bail --cov
+      - uses: codecov/codecov-action@v1
   test-firefox:
     needs: check
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: microsoft/playwright-github-action@v1
+      - run: npm install
+      - run: npx aegir test -t browser -t webworker --bail -- --browser firefox
+  test-webkit:
+    needs: check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: microsoft/playwright-github-action@v1
       - run: npm install
-      - run: npx aegir test -t browser -t webworker --bail -- --browsers FirefoxHeadless
+      - run: npx aegir test -t browser -t webworker --bail -- --browser webkit
   test-electron-main:
     needs: check
     runs-on: ubuntu-latest
diff --git a/.gitignore b/.gitignore
index 83922d23..01782c1a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,4 +35,5 @@ node_modules
 
 dist
 docs
-yarn.lock
\ No newline at end of file
+yarn.lock
+.nyc_output
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70e8d49c..8dcb4b9a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,39 @@
+## [4.0.2](https://github.com/multiformats/js-multihash/compare/v4.0.1...v4.0.2) (2021-03-03)
+
+
+### Bug Fixes
+
+* revert to node12 ([adf5a6c](https://github.com/multiformats/js-multihash/commit/adf5a6c1af5176ef2ba7dd6bb9d429b043c7c88d))
+
+
+
+## [4.0.1](https://github.com/multiformats/js-multihash/compare/v4.0.0...v4.0.1) (2021-03-01)
+
+
+### Bug Fixes
+
+* downgrade varint ([#118](https://github.com/multiformats/js-multihash/issues/118)) ([e84aabb](https://github.com/multiformats/js-multihash/commit/e84aabbd906fa7a5cdea69c4633d4bb87e01a898))
+
+
+
+# [4.0.0](https://github.com/multiformats/js-multihash/compare/v3.1.2...v4.0.0) (2021-03-01)
+
+
+### Bug Fixes
+
+* update to new aegir ([#115](https://github.com/multiformats/js-multihash/issues/115)) ([1d8348d](https://github.com/multiformats/js-multihash/commit/1d8348d11d7c8b5cebd22b74ffbd9cf4a69ac786))
+
+
+### BREAKING CHANGES
+
+* No longer supports deep type imports only from the entrypoint.
+
+
+
+## [3.1.3-0](https://github.com/multiformats/js-multihash/compare/v3.1.2...v3.1.3-0) (2021-02-13)
+
+
+
 ## [3.1.2](https://github.com/multiformats/js-multihash/compare/v3.1.1...v3.1.2) (2021-01-26)
 
 
diff --git a/package.json b/package.json
index 4d0116a6..d18854be 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "multihashes",
-  "version": "3.1.2",
+  "version": "4.0.2",
   "description": "multihash implementation",
   "keywords": [
     "multihash",
@@ -30,30 +30,24 @@
   },
   "main": "src/index.js",
   "types": "dist/src/index.d.ts",
-  "typesVersions": {
-    "*": {
-      "src/*": [
-        "dist/src/*",
-        "dist/src/*/index"
-      ],
-      "src/": [
-        "dist/src/index"
-      ]
-    }
-  },
   "repository": "github:multiformats/js-multihash",
   "dependencies": {
-    "multibase": "^3.1.0",
-    "uint8arrays": "^2.0.5",
-    "varint": "^6.0.0"
+    "multibase": "^4.0.1",
+    "uint8arrays": "^2.1.3",
+    "varint": "^5.0.2"
   },
   "devDependencies": {
-    "aegir": "^30.3.0",
-    "ipfs-utils": "^5.0.1"
+    "aegir": "^31.0.0",
+    "ipfs-utils": "^6.0.1"
   },
   "eslintConfig": {
     "extends": "ipfs"
   },
+  "aegir": {
+    "build": {
+      "bundlesizeMax": "5.8kB"
+    }
+  },
   "contributors": [
     "David Dias <daviddias.p@gmail.com>",
     "Hugo Dias <hugomrdias@gmail.com>",
@@ -79,7 +73,7 @@
     "Alan Shaw <alan@tableflip.io>"
   ],
   "engines": {
-    "node": ">=10.0.0",
+    "node": ">=12.0.0",
     "npm": ">=6.0.0"
   }
 }
diff --git a/src/index.js b/src/index.js
index 09809c08..dfb18d4f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,7 +1,5 @@
 /**
  * Multihash implementation in JavaScript.
- *
- * @module multihash
  */
 'use strict'
 
@@ -19,6 +17,7 @@ for (const key in names) {
   const name = /** @type {HashName} */(key)
   codes[names[name]] = name
 }
+Object.freeze(codes)
 
 /**
  * Convert the given multihash to a hex encoded string.
@@ -229,7 +228,7 @@ function prefix (multihash) {
 
 module.exports = {
   names,
-  codes: Object.freeze(codes),
+  codes,
   toHexString,
   fromHexString,
   toB58String,
diff --git a/src/types.ts b/src/types.d.ts
similarity index 100%
rename from src/types.ts
rename to src/types.d.ts