diff --git a/.aegir.js b/.aegir.js
new file mode 100644
index 0000000..25fbe20
--- /dev/null
+++ b/.aegir.js
@@ -0,0 +1,3 @@
+module.exports = {
+  bundlesize: { maxSize: '155kB' }
+}
diff --git a/.travis.yml b/.travis.yml
index 88040e7..00e0e5f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,7 +23,7 @@ jobs:
   include:
     - stage: check
       script:
-        - npx aegir commitlint --travis
+        - npx aegir build --bundlesize
         - npx aegir dep-check
         - npm run lint
 
diff --git a/package.json b/package.json
index abc1dd9..ad300c5 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "release-minor": "aegir release --type minor",
     "release-major": "aegir release --type major",
     "coverage": "aegir coverage --ignore src/keys/keys.proto.js",
-    "size": "bundlesize -f dist/index.min.js -s 139kB"
+    "size": "aegir build --bundlesize"
   },
   "keywords": [
     "IPFS",
@@ -36,7 +36,7 @@
   "license": "MIT",
   "dependencies": {
     "asmcrypto.js": "^2.3.2",
-    "asn1.js": "^5.0.1",
+    "asn1.js": "^5.2.0",
     "bn.js": "^5.0.0",
     "browserify-aes": "^1.2.0",
     "bs58": "^4.0.1",
@@ -44,22 +44,21 @@
     "iso-random-stream": "^1.1.0",
     "keypair": "^1.0.1",
     "libp2p-crypto-secp256k1": "~0.4.0",
-    "multihashing-async": "~0.7.0",
+    "multihashing-async": "~0.8.0",
     "node-forge": "~0.9.1",
     "pem-jwk": "^2.0.0",
     "protons": "^1.0.1",
     "rsa-pem-to-jwk": "^1.1.3",
     "tweetnacl": "^1.0.1",
-    "ursa-optional": "~0.10.0"
+    "ursa-optional": "~0.10.1"
   },
   "devDependencies": {
-    "aegir": "^19.0.5",
+    "aegir": "^20.4.1",
     "benchmark": "^2.1.4",
-    "bundlesize": "~0.18.0",
     "chai": "^4.2.0",
     "chai-string": "^1.5.0",
     "dirty-chai": "^2.0.1",
-    "sinon": "^7.3.2"
+    "sinon": "^7.5.0"
   },
   "engines": {
     "node": ">=10.0.0",
diff --git a/src/keys/index.js b/src/keys/index.js
index 205d108..7775c71 100644
--- a/src/keys/index.js
+++ b/src/keys/index.js
@@ -25,7 +25,7 @@ const ErrMissingSecp256K1 = {
 }
 
 function typeToKey (type) {
-  let key = supportedKeys[type.toLowerCase()]
+  const key = supportedKeys[type.toLowerCase()]
   if (!key) {
     const supported = Object.keys(supportedKeys).join(' / ')
     throw errcode(new Error(`invalid or unsupported key type ${type}. Must be ${supported}`), 'ERR_UNSUPPORTED_KEY_TYPE')
diff --git a/src/keys/key-stretcher.js b/src/keys/key-stretcher.js
index cca8178..c9c5366 100644
--- a/src/keys/key-stretcher.js
+++ b/src/keys/key-stretcher.js
@@ -29,7 +29,7 @@ module.exports = async (cipherType, hash, secret) => {
   }
 
   if (!hash) {
-    throw errcode(new Error(`missing hash type`), 'ERR_MISSING_HASH_TYPE')
+    throw errcode(new Error('missing hash type'), 'ERR_MISSING_HASH_TYPE')
   }
 
   const cipherKeySize = cipher.keySize
@@ -41,7 +41,7 @@ module.exports = async (cipherType, hash, secret) => {
   const m = await hmac.create(hash, secret)
   let a = await m.digest(seed)
 
-  let result = []
+  const result = []
   let j = 0
 
   while (j < resultLength) {
diff --git a/src/util.js b/src/util.js
index e5f7b6b..3624bfe 100644
--- a/src/util.js
+++ b/src/util.js
@@ -6,7 +6,7 @@ const BN = require('asn1.js').bignum
 // Adapted from https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-41#appendix-C
 exports.toBase64 = function toBase64 (bn, len) {
   // if len is defined then the bytes are leading-0 padded to the length
-  let s = bn.toArrayLike(Buffer, 'be', len).toString('base64')
+  const s = bn.toArrayLike(Buffer, 'be', len).toString('base64')
 
   return s
     .replace(/(=*)$/, '') // Remove any trailing '='s
diff --git a/test/helpers/test-garbage-error-handling.js b/test/helpers/test-garbage-error-handling.js
index 324789c..75d8ab2 100644
--- a/test/helpers/test-garbage-error-handling.js
+++ b/test/helpers/test-garbage-error-handling.js
@@ -14,7 +14,7 @@ function doTests (fncName, fnc, num, skipBuffersAndStrings) {
       // skip this garbage because it's a buffer or a string and we were told do do that
       return
     }
-    let args = []
+    const args = []
     for (let i = 0; i < num; i++) {
       args.push(garbage)
     }
diff --git a/test/keys/ephemeral-keys.spec.js b/test/keys/ephemeral-keys.spec.js
index 5ad6645..57fcb00 100644
--- a/test/keys/ephemeral-keys.spec.js
+++ b/test/keys/ephemeral-keys.spec.js
@@ -61,7 +61,7 @@ describe('generateEphemeralKeyPair', () => {
     })
   })
 
-  it(`handles bad curve name`, async () => {
+  it('handles bad curve name', async () => {
     try {
       await crypto.keys.generateEphemeralKeyPair('bad name')
     } catch (err) {
diff --git a/test/util.spec.js b/test/util.spec.js
index bf66ccd..3688861 100644
--- a/test/util.spec.js
+++ b/test/util.spec.js
@@ -24,7 +24,7 @@ describe('Util', () => {
   })
 
   it('toBase64 zero padding', (done) => {
-    let bnpad = new BN('ff', 16)
+    const bnpad = new BN('ff', 16)
     expect(util.toBase64(bnpad, 2)).to.eql('AP8')
     done()
   })