diff --git a/README.md b/README.md
index 86498dce..45e3ab9b 100644
--- a/README.md
+++ b/README.md
@@ -514,46 +514,7 @@ const stringify = fastJson(schema, { schema: externalSchema })
 
 <a name="long"></a>
 #### Long integers
-By default the library will handle automatically [BigInt](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt) from Node.js v10.3 and above.
-If you can't use BigInts in your environment, long integers (64-bit) are also supported using the [long](https://github.com/dcodeIO/long.js) module.
-Example:
-```javascript
-// => using native BigInt
-const stringify = fastJson({
-  title: 'Example Schema',
-  type: 'object',
-  properties: {
-    id: {
-      type: 'integer'
-    }
-  }
-})
-
-const obj = {
-  id: 18446744073709551615n
-}
-
-console.log(stringify(obj)) // '{"id":18446744073709551615}'
-
-// => using the long library
-const Long = require('long')
-
-const stringify = fastJson({
-  title: 'Example Schema',
-  type: 'object',
-  properties: {
-    id: {
-      type: 'integer'
-    }
-  }
-})
-
-const obj = {
-  id: Long.fromString('18446744073709551615', true)
-}
-
-console.log(stringify(obj)) // '{"id":18446744073709551615}'
-```
+By default the library will handle automatically [BigInt](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt).
 
 <a name="integer"></a>
 #### Integers
diff --git a/index.js b/index.js
index b4e03114..55ce3981 100644
--- a/index.js
+++ b/index.js
@@ -10,13 +10,6 @@ const fjsCloned = Symbol('fast-json-stringify.cloned')
 const validate = require('./schema-validator')
 let stringSimilarity = null
 
-let isLong
-try {
-  isLong = require('long').isLong
-} catch (e) {
-  isLong = null
-}
-
 const addComma = `
   if (addComma) {
     json += ','
@@ -121,8 +114,6 @@ function build (schema, options) {
     })()
 
 
-    var isLong = ${isLong ? isLong.toString() : false}
-
     function parseInteger(int) { return Math.${intParseFunctionName}(int) }
     `
 
@@ -286,9 +277,7 @@ function $asNull () {
 }
 
 function $asInteger (i) {
-  if (isLong && isLong(i)) {
-    return i.toString()
-  } else if (typeof i === 'bigint') {
+  if (typeof i === 'bigint') {
     return i.toString()
   } else if (Number.isInteger(i)) {
     return $asNumber(i)
@@ -547,22 +536,11 @@ function additionalProperty (location) {
   } else if (type === 'integer') {
     code += `
         var t = Number(obj[keys[i]])
+        if (!isNaN(t)) {
+          ${addComma}
+          json += $asString(keys[i]) + ':' + t
+        }
     `
-    if (isLong) {
-      code += `
-          if (isLong(obj[keys[i]]) || !isNaN(t)) {
-            ${addComma}
-            json += $asString(keys[i]) + ':' + $asInteger(obj[keys[i]])
-          }
-      `
-    } else {
-      code += `
-          if (!isNaN(t)) {
-            ${addComma}
-            json += $asString(keys[i]) + ':' + t
-          }
-      `
-    }
   } else if (type === 'number') {
     code += `
         var t = Number(obj[keys[i]])
@@ -764,33 +742,12 @@ function buildCode (location, code, laterCode, name) {
     } else if (type === 'integer') {
       code += `
           var rendered = false
-      `
-      if (isLong) {
-        code += `
-            if (isLong(obj[${sanitized}])) {
-              ${addComma}
-              json += ${asString} + ':' + obj[${sanitized}].toString()
-              rendered = true
-            } else {
-              var t = Number(obj[${sanitized}])
-              if (!isNaN(t)) {
-                ${addComma}
-                json += ${asString} + ':' + t
-                rendered = true
-              }
-            }
-        `
-      } else {
-        code += `
-            var t = Number(obj[${sanitized}])
-            if (!isNaN(t)) {
-              ${addComma}
-              json += ${asString} + ':' + t
-              rendered = true
-            }
-        `
-      }
-      code += `
+          var t = Number(obj[${sanitized}])
+          if (!isNaN(t)) {
+            ${addComma}
+            json += ${asString} + ':' + t
+            rendered = true
+          }
           if (rendered) {
       `
     } else {
diff --git a/package.json b/package.json
index 8f0909a7..243f0084 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,6 @@
     "benchmark": "^2.1.4",
     "compile-json-stringify": "^0.1.2",
     "is-my-json-valid": "^2.20.0",
-    "long": "^4.0.0",
     "moment": "^2.24.0",
     "pre-commit": "^1.2.2",
     "proxyquire": "^2.1.3",
diff --git a/test/bigint.js b/test/bigint.js
deleted file mode 100644
index ec166b46..00000000
--- a/test/bigint.js
+++ /dev/null
@@ -1,74 +0,0 @@
-'use strict'
-
-module.exports = function (test, build) {
-  test('render a bigint as JSON', (t) => {
-    t.plan(1)
-
-    const schema = {
-      title: 'bigint',
-      type: 'integer'
-    }
-
-    const stringify = build(schema)
-    const output = stringify(1615n)
-
-    t.equal(output, '1615')
-  })
-
-  test('render an object with a bigint as JSON', (t) => {
-    t.plan(1)
-
-    const schema = {
-      title: 'object with bigint',
-      type: 'object',
-      properties: {
-        id: {
-          type: 'integer'
-        }
-      }
-    }
-
-    const stringify = build(schema)
-    const output = stringify({
-      id: 1615n
-    })
-
-    t.equal(output, '{"id":1615}')
-  })
-
-  test('render an array with a bigint as JSON', (t) => {
-    t.plan(1)
-
-    const schema = {
-      title: 'array with bigint',
-      type: 'array',
-      items: {
-        type: 'integer'
-      }
-    }
-
-    const stringify = build(schema)
-    const output = stringify([1615n])
-
-    t.equal(output, '[1615]')
-  })
-
-  test('render an object with an additionalProperty of type bigint as JSON', (t) => {
-    t.plan(1)
-
-    const schema = {
-      title: 'object with bigint',
-      type: 'object',
-      additionalProperties: {
-        type: 'integer'
-      }
-    }
-
-    const stringify = build(schema)
-    const output = stringify({
-      num: 1615n
-    })
-
-    t.equal(output, '{"num":1615}')
-  })
-}
diff --git a/test/bigint.test.js b/test/bigint.test.js
new file mode 100644
index 00000000..02a75d4d
--- /dev/null
+++ b/test/bigint.test.js
@@ -0,0 +1,76 @@
+'use strict'
+
+const t = require('tap')
+const test = t.test
+const build = require('..')
+
+test('render a bigint as JSON', (t) => {
+  t.plan(1)
+
+  const schema = {
+    title: 'bigint',
+    type: 'integer'
+  }
+
+  const stringify = build(schema)
+  const output = stringify(1615n)
+
+  t.equal(output, '1615')
+})
+
+test('render an object with a bigint as JSON', (t) => {
+  t.plan(1)
+
+  const schema = {
+    title: 'object with bigint',
+    type: 'object',
+    properties: {
+      id: {
+        type: 'integer'
+      }
+    }
+  }
+
+  const stringify = build(schema)
+  const output = stringify({
+    id: 1615n
+  })
+
+  t.equal(output, '{"id":1615}')
+})
+
+test('render an array with a bigint as JSON', (t) => {
+  t.plan(1)
+
+  const schema = {
+    title: 'array with bigint',
+    type: 'array',
+    items: {
+      type: 'integer'
+    }
+  }
+
+  const stringify = build(schema)
+  const output = stringify([1615n])
+
+  t.equal(output, '[1615]')
+})
+
+test('render an object with an additionalProperty of type bigint as JSON', (t) => {
+  t.plan(1)
+
+  const schema = {
+    title: 'object with bigint',
+    type: 'object',
+    additionalProperties: {
+      type: 'integer'
+    }
+  }
+
+  const stringify = build(schema)
+  const output = stringify({
+    num: 1615n
+  })
+
+  t.equal(output, '{"num":1615}')
+})
diff --git a/test/integer.test.js b/test/integer.test.js
index c2c7d04d..fd1530f9 100644
--- a/test/integer.test.js
+++ b/test/integer.test.js
@@ -2,10 +2,8 @@
 
 const t = require('tap')
 const test = t.test
-const semver = require('semver')
 const validator = require('is-my-json-valid')
-const proxyquire = require('proxyquire')
-const build = proxyquire('..', { long: null })
+const build = require('..')
 
 test('render an integer as JSON', (t) => {
   t.plan(2)
@@ -130,10 +128,3 @@ test('render an object with an additionalProperty of type integer as JSON', (t)
   t.equal(output, '{"num":1615}')
   t.ok(validate(JSON.parse(output)), 'valid schema')
 })
-
-if (semver.gt(process.versions.node, '10.3.0')) {
-  require('./bigint')(t.test, build)
-} else {
-  t.pass('Skip because Node version < 10.4')
-  t.end()
-}
diff --git a/test/long.test.js b/test/long.test.js
deleted file mode 100644
index d5bf1138..00000000
--- a/test/long.test.js
+++ /dev/null
@@ -1,85 +0,0 @@
-'use strict'
-
-const test = require('tap').test
-const validator = require('is-my-json-valid')
-const Long = require('long')
-const build = require('..')
-
-test('render a long as JSON', (t) => {
-  t.plan(2)
-
-  const schema = {
-    title: 'long',
-    type: 'integer'
-  }
-
-  const validate = validator(schema)
-  const stringify = build(schema)
-  const output = stringify(Long.fromString('18446744073709551615', true))
-
-  t.equal(output, '18446744073709551615')
-  t.ok(validate(JSON.parse(output)), 'valid schema')
-})
-
-test('render an object with long as JSON', (t) => {
-  t.plan(2)
-
-  const schema = {
-    title: 'object with long',
-    type: 'object',
-    properties: {
-      id: {
-        type: 'integer'
-      }
-    }
-  }
-
-  const validate = validator(schema)
-  const stringify = build(schema)
-  const output = stringify({
-    id: Long.fromString('18446744073709551615', true)
-  })
-
-  t.equal(output, '{"id":18446744073709551615}')
-  t.ok(validate(JSON.parse(output)), 'valid schema')
-})
-
-test('render an array with long as JSON', (t) => {
-  t.plan(2)
-
-  const schema = {
-    title: 'array with long',
-    type: 'array',
-    items: {
-      type: 'integer'
-    }
-  }
-
-  const validate = validator(schema)
-  const stringify = build(schema)
-  const output = stringify([Long.fromString('18446744073709551615', true)])
-
-  t.equal(output, '[18446744073709551615]')
-  t.ok(validate(JSON.parse(output)), 'valid schema')
-})
-
-test('render an object with a long additionalProperty as JSON', (t) => {
-  t.plan(2)
-
-  const schema = {
-    title: 'object with long',
-    type: 'object',
-    additionalProperties: {
-      type: 'integer'
-    }
-  }
-
-  const validate = validator(schema)
-  const stringify = build(schema)
-  const output = stringify({
-    num: Long.fromString('18446744073709551615', true)
-  })
-
-  t.equal(output, '{"num":18446744073709551615}')
-  t.ok(validate(JSON.parse(output)), 'valid schema')
-})