diff --git a/packages/ripple-binary-codec/package.json b/packages/ripple-binary-codec/package.json
index 9b23674e..2679351a 100644
--- a/packages/ripple-binary-codec/package.json
+++ b/packages/ripple-binary-codec/package.json
@@ -12,6 +12,7 @@
   },
   "dependencies": {
     "buffer": "6.0.3",
+    "bignumber.js": "^9.0.0",
     "create-hash": "^1.2.0",
     "ripple-address-codec": "^4.3.1"
   },
diff --git a/packages/ripple-binary-codec/src/types/amount.ts b/packages/ripple-binary-codec/src/types/amount.ts
index a389459b..4dcc1867 100644
--- a/packages/ripple-binary-codec/src/types/amount.ts
+++ b/packages/ripple-binary-codec/src/types/amount.ts
@@ -17,7 +17,7 @@ const MIN_XRP = new BigNumber('1e-6')
 const mask = BigInt(0x00000000ffffffff)
 
 /**
- * decimal.js configuration for Amount IOUs
+ * BigNumber configuration for Amount IOUs
  */
 BigNumber.config({
   EXPONENTIAL_AT: [
@@ -207,7 +207,7 @@ class Amount extends SerializedType {
   /**
    * Validate IOU.value amount
    *
-   * @param decimal Decimal.js object representing IOU.value
+   * @param decimal BigNumber object representing IOU.value
    * @returns void, but will throw if invalid amount
    */
   private static assertIouIsValid(decimal: BigNumber): void {
diff --git a/packages/ripple-keypairs/test/codec.test.ts b/packages/ripple-keypairs/test/codec.test.ts
deleted file mode 100644
index 11953745..00000000
--- a/packages/ripple-keypairs/test/codec.test.ts
+++ /dev/null
@@ -1,58 +0,0 @@
-import assert from 'assert'
-import * as api from 'ripple-address-codec'
-
-function toHex(bytes) {
-  return Buffer.from(bytes).toString('hex').toUpperCase()
-}
-
-function toBytes(hex) {
-  return Buffer.from(hex, 'hex').toJSON().data
-}
-
-describe('ripple-address-codec', function () {
-  function makeTest(type, base58, hex) {
-    it(`can translate between ${hex} and ${base58} (encode ${type})`, () => {
-      const actual = api[`encode${type}`](toBytes(hex))
-      assert.equal(actual, base58)
-    })
-    it(`can translate between ${base58} and ${hex} (decode ${type})`, () => {
-      const buf = api[`decode${type}`](base58)
-      assert.equal(toHex(buf), hex)
-    })
-  }
-
-  makeTest(
-    'AccountID',
-    'rJrRMgiRgrU6hDF4pgu5DXQdWyPbY35ErN',
-    'BA8E78626EE42C41B46D46C3048DF3A1C3C87072',
-  )
-
-  makeTest(
-    'NodePublic',
-    'n9MXXueo837zYH36DvMc13BwHcqtfAWNJY5czWVbp7uYTj7x17TH',
-    '0388E5BA87A000CB807240DF8C848EB0B5FFA5C8E5A521BC8E105C0F0A44217828',
-  )
-
-  it('can decode arbitrary seeds', () => {
-    const decoded = api.decodeSeed('sEdTM1uX8pu2do5XvTnutH6HsouMaM2')
-    assert.equal(toHex(decoded.bytes), '4C3A1D213FBDFB14C7C28D609469B341')
-    assert.equal(decoded.type, 'ed25519')
-
-    const decoded2 = api.decodeSeed('sn259rEFXrQrWyx3Q7XneWcwV6dfL')
-    assert.equal(toHex(decoded2.bytes), 'CF2DE378FBDD7E2EE87D486DFB5A7BFF')
-    assert.equal(decoded2.type, 'secp256k1')
-  })
-
-  it('can pass a type as second arg to encodeSeed', () => {
-    const edSeed = 'sEdTM1uX8pu2do5XvTnutH6HsouMaM2'
-    const decoded = api.decodeSeed(edSeed)
-    assert.equal(toHex(decoded.bytes), '4C3A1D213FBDFB14C7C28D609469B341')
-    assert.equal(decoded.type, 'ed25519')
-    if (decoded.type === null) {
-      assert.fail('decoded.type should not be null')
-    }
-    assert.equal(api.encodeSeed(decoded.bytes, decoded.type), edSeed)
-  })
-})
-
-export {}
diff --git a/packages/ripple-keypairs/test/xrp-codec.test.ts b/packages/ripple-keypairs/test/xrp-codec.test.ts
deleted file mode 100644
index 05bd7655..00000000
--- a/packages/ripple-keypairs/test/xrp-codec.test.ts
+++ /dev/null
@@ -1,99 +0,0 @@
-import assert from 'assert'
-import * as api from 'ripple-address-codec'
-
-function toHex(bytes: Buffer) {
-  return Buffer.from(bytes).toString('hex').toUpperCase()
-}
-
-function toBytes(hex: string) {
-  return Buffer.from(hex, 'hex').toJSON().data
-}
-
-describe('ripple-address-codec', function () {
-  describe('encodeSeed', function () {
-    it('encodes a secp256k1 seed', () => {
-      const result = api.encodeSeed(
-        Buffer.from(toBytes('CF2DE378FBDD7E2EE87D486DFB5A7BFF')),
-        'secp256k1',
-      )
-      assert.equal(result, 'sn259rEFXrQrWyx3Q7XneWcwV6dfL')
-    })
-
-    it('encodes low secp256k1 seed', () => {
-      const result = api.encodeSeed(
-        Buffer.from(toBytes('00000000000000000000000000000000')),
-        'secp256k1',
-      )
-      assert.equal(result, 'sp6JS7f14BuwFY8Mw6bTtLKWauoUs')
-    })
-
-    it('encodes high secp256k1 seed', () => {
-      const result = api.encodeSeed(
-        Buffer.from(toBytes('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF')),
-        'secp256k1',
-      )
-      assert.equal(result, 'saGwBRReqUNKuWNLpUAq8i8NkXEPN')
-    })
-
-    it('encodes an ed25519 seed', () => {
-      const result = api.encodeSeed(
-        Buffer.from(toBytes('4C3A1D213FBDFB14C7C28D609469B341')),
-        'ed25519',
-      )
-      assert.equal(result, 'sEdTM1uX8pu2do5XvTnutH6HsouMaM2')
-    })
-
-    it('encodes low ed25519 seed', () => {
-      const result = api.encodeSeed(
-        Buffer.from(toBytes('00000000000000000000000000000000')),
-        'ed25519',
-      )
-      assert.equal(result, 'sEdSJHS4oiAdz7w2X2ni1gFiqtbJHqE')
-    })
-
-    it('encodes high ed25519 seed', () => {
-      const result = api.encodeSeed(
-        Buffer.from(toBytes('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF')),
-        'ed25519',
-      )
-      assert.equal(result, 'sEdV19BLfeQeKdEXyYA4NhjPJe6XBfG')
-    })
-  })
-
-  describe('decodeSeed', function () {
-    it('can decode an Ed25519 seed', () => {
-      const decoded = api.decodeSeed('sEdTM1uX8pu2do5XvTnutH6HsouMaM2')
-      assert.equal(toHex(decoded.bytes), '4C3A1D213FBDFB14C7C28D609469B341')
-      assert.equal(decoded.type, 'ed25519')
-    })
-
-    it('can decode a secp256k1 seed', () => {
-      const decoded = api.decodeSeed('sn259rEFXrQrWyx3Q7XneWcwV6dfL')
-      assert.equal(toHex(decoded.bytes), 'CF2DE378FBDD7E2EE87D486DFB5A7BFF')
-      assert.equal(decoded.type, 'secp256k1')
-    })
-  })
-
-  describe('encodeAccountID', function () {
-    it('can encode an AccountID', () => {
-      const encoded = api.encodeAccountID(
-        Buffer.from(toBytes('BA8E78626EE42C41B46D46C3048DF3A1C3C87072')),
-      )
-      assert.equal(encoded, 'rJrRMgiRgrU6hDF4pgu5DXQdWyPbY35ErN')
-    })
-  })
-
-  describe('decodeNodePublic', function () {
-    it('can decode a NodePublic', () => {
-      const decoded = api.decodeNodePublic(
-        'n9MXXueo837zYH36DvMc13BwHcqtfAWNJY5czWVbp7uYTj7x17TH',
-      )
-      assert.equal(
-        toHex(decoded),
-        '0388E5BA87A000CB807240DF8C848EB0B5FFA5C8E5A521BC8E105C0F0A44217828',
-      )
-    })
-  })
-})
-
-export {}