diff --git a/README.md b/README.md
index 9815e35..425bd12 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ functions with their parameters reversed (as [lodash-fp] do).
 
 Note that the parameters may be backwards from what you are used to. updeep
 supports [partial application][currying], so the parameter order is:
-`updeep(updates, obj)`.
+`updeep(updates, object)`.
 
 ## API and Examples
 
@@ -134,13 +134,13 @@ Apply updates only if `predicate` is truthy or, if `predicate` is a function,
 if it evaluates to truthy when called with `object`.
 
 ```js
-var obj = { a: 2 };
+var object = { a: 2 };
 function isEven(x) { return x % 2 === 0; }
 function inc(x) { return x + 1; }
 
 u({
   a: u.if(isEven, inc),
-}, obj);
+}, object);
 // => { a: 3 }
 ```
 
@@ -148,7 +148,7 @@ u({
 
 If iteratee is a function, map it over the values in `object`.
 If it is an object, apply it as updates to each value in `object`,
-which is equivalent to  `u.map(u(...), obj)`).
+which is equivalent to  `u.map(u(...), object)`).
 
 ```js
 function inc(x) { return x + 1; }
diff --git a/lib/freeze.js b/lib/freeze.js
index dd852a8..361d057 100644
--- a/lib/freeze.js
+++ b/lib/freeze.js
@@ -1,35 +1,35 @@
-function isFreezable(obj) {
-  if (obj === null) return false;
+function isFreezable(object) {
+  if (object === null) return false;
 
-  return Array.isArray(obj) ||
-    typeof obj === 'object';
+  return Array.isArray(object) ||
+    typeof object === 'object';
 }
 
-function needsFreezing(obj) {
-  return isFreezable(obj) && !Object.isFrozen(obj);
+function needsFreezing(object) {
+  return isFreezable(object) && !Object.isFrozen(object);
 }
 
-function recur(obj) {
-  Object.freeze(obj);
+function recur(object) {
+  Object.freeze(object);
 
-  Object.keys(obj).forEach((key) => {
-    const value = obj[key];
+  Object.keys(object).forEach((key) => {
+    const value = object[key];
     if (needsFreezing(value)) {
       recur(value);
     }
   });
 
-  return obj;
+  return object;
 }
 
-export default function freeze(obj) {
+export default function freeze(object) {
   if (process.env.NODE_ENV === 'production') {
-    return obj;
+    return object;
   }
 
-  if (needsFreezing(obj)) {
-    recur(obj);
+  if (needsFreezing(object)) {
+    recur(object);
   }
 
-  return obj;
+  return object;
 }
diff --git a/lib/in.js b/lib/in.js
index 05dbc09..a72472f 100644
--- a/lib/in.js
+++ b/lib/in.js
@@ -1,11 +1,11 @@
 import curry from 'lodash/function/curry';
 import update from './update';
 
-function updateIn(path, value, obj) {
+function updateIn(path, value, object) {
   const parts = Array.isArray(path) ? path : path.split('.');
   const updates = parts.reduceRight((acc, key) => ({ [key]: acc }), value);
 
-  return update(updates, obj);
+  return update(updates, object);
 }
 
 export default curry(updateIn);
diff --git a/lib/index.js b/lib/index.js
index 1fcbf55..55a4153 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -9,8 +9,8 @@ import update from './update';
 
 import curry from 'lodash/function/curry';
 
-function updateAndFreeze(updates, obj) {
-  return freeze(update(updates, obj));
+function updateAndFreeze(updates, object) {
+  return freeze(update(updates, object));
 }
 
 const updeep = curry(updateAndFreeze);
diff --git a/lib/update.js b/lib/update.js
index 1a0fc87..e723409 100644
--- a/lib/update.js
+++ b/lib/update.js
@@ -2,16 +2,16 @@ import reduce from 'lodash/collection/reduce';
 import isEmpty from 'lodash/lang/isEmpty';
 import assign from 'lodash/object/assign';
 
-function resolveUpdates(updates, obj = {}) {
+function resolveUpdates(updates, object = {}) {
   return reduce(updates, (acc, value, key) => {
     let updatedValue = value;
     if (!Array.isArray(value) && value !== null && typeof value === 'object') {
-      updatedValue = update(value, obj[key]);
+      updatedValue = update(value, object[key]);
     } else if (typeof value === 'function') {
-      updatedValue = value(obj[key]);
+      updatedValue = value(object[key]);
     }
 
-    if (obj[key] !== updatedValue) {
+    if (object[key] !== updatedValue) {
       acc[key] = updatedValue;
     }
 
@@ -19,8 +19,8 @@ function resolveUpdates(updates, obj = {}) {
   }, {});
 }
 
-function updateArray(updates, obj) {
-  const newObj = [...obj];
+function updateArray(updates, object) {
+  const newObj = [...object];
 
   return reduce(updates, (acc, value, index) => {
     acc[index] = value;
@@ -43,22 +43,22 @@ function updateArray(updates, obj) {
  * @param {Object|Array}    object to update
  * @return {Object|Array}   new object with modifications
  */
-function update(updates, obj) {
+function update(updates, object) {
   if (typeof updates === 'function') {
-    return updates(obj);
+    return updates(object);
   }
 
-  const resolvedUpdates = resolveUpdates(updates, obj);
+  const resolvedUpdates = resolveUpdates(updates, object);
 
   if (isEmpty(resolvedUpdates)) {
-    return obj;
+    return object;
   }
 
-  if (Array.isArray(obj)) {
-    return updateArray(resolvedUpdates, obj);
+  if (Array.isArray(object)) {
+    return updateArray(resolvedUpdates, object);
   }
 
-  return assign({}, obj, resolvedUpdates);
+  return assign({}, object, resolvedUpdates);
 }
 
 export default update;
diff --git a/test/freeze-spec.js b/test/freeze-spec.js
index 7f12721..c749e74 100644
--- a/test/freeze-spec.js
+++ b/test/freeze-spec.js
@@ -7,59 +7,59 @@ describe('u.freeze', () => {
   });
 
   it('freezes objects', () => {
-    const obj = {};
-    u.freeze(obj);
+    const object = {};
+    u.freeze(object);
 
-    expect(Object.isFrozen(obj)).to.be.true;
+    expect(Object.isFrozen(object)).to.be.true;
   });
 
   it('freezes nested objects', () => {
-    const obj = { foo: { bar: 3 } };
-    u.freeze(obj);
+    const object = { foo: { bar: 3 } };
+    u.freeze(object);
 
-    expect(Object.isFrozen(obj.foo)).to.be.true;
+    expect(Object.isFrozen(object.foo)).to.be.true;
   });
 
   it('freezes nested arrays', () => {
-    const obj = [[0]];
-    u.freeze(obj);
+    const object = [[0]];
+    u.freeze(object);
 
-    expect(Object.isFrozen(obj)).to.be.true;
-    expect(Object.isFrozen(obj[0])).to.be.true;
+    expect(Object.isFrozen(object)).to.be.true;
+    expect(Object.isFrozen(object[0])).to.be.true;
   });
 
   it('ignores functions', () => {
-    const obj = { foo: () => 1 };
-    u.freeze(obj);
+    const object = { foo: () => 1 };
+    u.freeze(object);
 
-    expect(Object.isFrozen(obj.foo)).to.be.false;
+    expect(Object.isFrozen(object.foo)).to.be.false;
   });
 
   it('does not freeze children if the parent is already frozen', () => {
-    const obj = { foo: {} };
-    Object.freeze(obj);
-    u.freeze(obj);
+    const object = { foo: {} };
+    Object.freeze(object);
+    u.freeze(object);
 
-    expect(Object.isFrozen(obj.foo)).to.be.false;
+    expect(Object.isFrozen(object.foo)).to.be.false;
   });
 
   it('does not freeze in production', () => {
     process.env.NODE_ENV = 'production';
-    const obj = {};
-    u.freeze(obj);
+    const object = {};
+    u.freeze(object);
 
-    expect(Object.isFrozen(obj)).to.be.false;
+    expect(Object.isFrozen(object)).to.be.false;
   });
 
   it('handles null objects', () => {
-    const obj = { foo: null };
-    u.freeze(obj);
-    expect(Object.isFrozen(obj)).to.be.true;
+    const object = { foo: null };
+    u.freeze(object);
+    expect(Object.isFrozen(object)).to.be.true;
   });
 
   it('returns the same object', () => {
-    const obj = {};
-    const result = u.freeze(obj);
-    expect(result).to.equal(obj);
+    const object = {};
+    const result = u.freeze(object);
+    expect(result).to.equal(object);
   });
 });
diff --git a/test/if-spec.js b/test/if-spec.js
index 194a976..784015d 100644
--- a/test/if-spec.js
+++ b/test/if-spec.js
@@ -3,33 +3,33 @@ import u from '../lib';
 
 describe('u.if', () => {
   it('does not update if the predicate is false', () => {
-    const obj = { a: 0 };
-    const result = u.if(false, { b: 1 }, obj);
-    expect(result).to.eql(obj);
+    const object = { a: 0 };
+    const result = u.if(false, { b: 1 }, object);
+    expect(result).to.eql(object);
   });
 
   it('does update if the predicate is true', () => {
-    const obj = { a: 0 };
-    const result = u.if(true, { b: 1 }, obj);
+    const object = { a: 0 };
+    const result = u.if(true, { b: 1 }, object);
     expect(result).to.eql({ a: 0, b: 1 });
   });
 
   it('will use the result of a function passed as a predicate', () => {
-    const obj = { a: 0 };
+    const object = { a: 0 };
     const aIsThree = x => x.a === 3;
-    const result = u.if(aIsThree, { b: 1 }, obj);
+    const result = u.if(aIsThree, { b: 1 }, object);
 
     expect(result).to.eql({ a: 0 });
   });
 
   it('can be partially applied', () => {
-    const obj = { a: 2 };
+    const object = { a: 2 };
     const isEven = x => x % 2 === 0;
     const inc = x => x + 1;
 
     const result = u({
       a: u.if(isEven, inc),
-    }, obj);
+    }, object);
 
     expect(result).to.eql({ a: 3 });
   });
diff --git a/test/in-spec.js b/test/in-spec.js
index f54e495..4c9d2be 100644
--- a/test/in-spec.js
+++ b/test/in-spec.js
@@ -3,33 +3,33 @@ import u from '../lib';
 
 describe('u.in', () => {
   it('can update a single path described with a string', () => {
-    const obj = { a: { b: 0 } };
-    const result = u.in('a.b', 3, obj);
+    const object = { a: { b: 0 } };
+    const result = u.in('a.b', 3, object);
     expect(result).to.eql({ a: { b: 3 } });
   });
 
   it('can update a single path described with a string with a function', () => {
     const inc = x => x + 1;
-    const obj = { a: { b: 0 } };
-    const result = u.in('a.b', inc, obj);
+    const object = { a: { b: 0 } };
+    const result = u.in('a.b', inc, object);
     expect(result).to.eql({ a: { b: 1 } });
   });
 
   it('can update a single path described with an array', () => {
-    const obj = { a: { b: 0 } };
-    const result = u.in(['a', 'b'], 3, obj);
+    const object = { a: { b: 0 } };
+    const result = u.in(['a', 'b'], 3, object);
     expect(result).to.eql({ a: { b: 3 } });
   });
 
   it('can update arrays', () => {
-    const obj = { a: [0, 0, 0] };
-    const result = u.in('a.1', 3, obj);
+    const object = { a: [0, 0, 0] };
+    const result = u.in('a.1', 3, object);
     expect(result).to.eql({ a: [0, 3, 0] });
   });
 
   it('can be partially applied', () => {
-    const obj = { a: { b: 0 } };
-    const result = u.in('a.b')(3)(obj);
+    const object = { a: { b: 0 } };
+    const result = u.in('a.b')(3)(object);
     expect(result).to.eql({ a: { b: 3 } });
   });
 });
diff --git a/test/map-spec.js b/test/map-spec.js
index 43d1334..3668bdd 100644
--- a/test/map-spec.js
+++ b/test/map-spec.js
@@ -3,35 +3,35 @@ import u from '../lib';
 
 describe('u.map', () => {
   it('applies updates to each item in an array', () => {
-    const obj = [0, 1, 2];
+    const object = [0, 1, 2];
     const inc = x => x + 1;
-    const result = u.map(inc, obj);
+    const result = u.map(inc, object);
 
     expect(result).to.eql([1, 2, 3]);
   });
 
   it('applies updates to each value in an object', () => {
-    const obj = { a: 0, b: 1, c: 2 };
+    const object = { a: 0, b: 1, c: 2 };
     const inc = x => x + 1;
-    const result = u.map(inc, obj);
+    const result = u.map(inc, object);
 
     expect(result).to.eql({ a: 1, b: 2, c: 3 });
   });
 
   it('can update with a regular updates object', () => {
-    const obj = [{ a: 0 }, { a: 0 }];
-    const result = u.map({ a: 1 }, obj);
+    const object = [{ a: 0 }, { a: 0 }];
+    const result = u.map({ a: 1 }, object);
 
     expect(result).to.eql([{ a: 1 }, { a: 1 }]);
   });
 
   it('passes the key or index as the second parameter to the iteratee', () => {
-    const obj = {
+    const object = {
       a: { x: 0 },
       b: [3, 3],
     };
     const setToKey = (_, key) => key;
-    const result = u.map(u.map(setToKey), obj);
+    const result = u.map(u.map(setToKey), object);
 
     expect(result).to.eql( {
       a: { x: 'x' },
@@ -40,13 +40,13 @@ describe('u.map', () => {
   });
 
   it('can be partially applied', () => {
-    const obj = {
+    const object = {
       b: [3, 3],
     };
     const setToKey = (_, key) => key;
     const result = u({
       b: u.map(setToKey),
-    }, obj);
+    }, object);
 
     expect(result).to.eql( {
       b: [0, 1],
diff --git a/test/updeep-spec.js b/test/updeep-spec.js
index c50383d..00c0a1c 100644
--- a/test/updeep-spec.js
+++ b/test/updeep-spec.js
@@ -3,84 +3,84 @@ import u from '../lib';
 
 describe('updeep', () => {
   it('does not change anything if no updates are specified', () => {
-    const obj = { foo: 3, bar: [7, 5] };
-    const result = u({}, obj);
+    const object = { foo: 3, bar: [7, 5] };
+    const result = u({}, object);
 
-    expect(result).to.equal(obj);
+    expect(result).to.equal(object);
   });
 
   it('can update with fixed values', () => {
-    const obj = { foo: 3, bar: [7, 5] };
-    const result = u({ foo: 4 }, obj);
+    const object = { foo: 3, bar: [7, 5] };
+    const result = u({ foo: 4 }, object);
 
     expect(result).to.deep.equal({ foo: 4, bar: [7, 5] });
   });
 
   it('returns the same instance if an update doesn\'t make changes', () => {
-    const obj = { foo: 3 };
-    const result = u({ foo: 3 }, obj);
+    const object = { foo: 3 };
+    const result = u({ foo: 3 }, object);
 
-    expect(result).to.equal(obj);
+    expect(result).to.equal(object);
   });
 
   it('can update a nested structure', () => {
-    const obj = { foo: { bar: 7, bam: 3 }, baz: 32 };
-    const result = u({ foo: { bar: 8 } }, obj);
+    const object = { foo: { bar: 7, bam: 3 }, baz: 32 };
+    const result = u({ foo: { bar: 8 } }, object);
 
     expect(result).to.deep.equal({ foo: { bar: 8, bam: 3 }, baz: 32 });
   });
 
   it('can update arrays', () => {
-    const obj = [1, 2, 3];
-    const result = u({ 1: 7 }, obj);
+    const object = [1, 2, 3];
+    const result = u({ 1: 7 }, object);
 
     expect(result).to.deep.equal([1, 7, 3]);
   });
 
   it('can add an element to an array', () => {
-    const obj = [];
-    const result = u({ 0: 3 }, obj);
+    const object = [];
+    const result = u({ 0: 3 }, object);
 
     expect(result).to.eql([3]);
   });
 
   it('can update nested arrays', () => {
-    const obj = { foo: [1, 2, 3], bar: 9 };
-    const result = u({ foo: { 1: 7 } }, obj);
+    const object = { foo: [1, 2, 3], bar: 9 };
+    const result = u({ foo: { 1: 7 } }, object);
 
     expect(result).to.deep.equal({ foo: [1, 7, 3], bar: 9 });
   });
 
   it('can use functions to update values', () => {
     const inc = (i) => i + 1;
-    const obj = { foo: 3, bar: 4, baz: 7 };
-    const result = u({ foo: inc, bar: inc }, obj);
+    const object = { foo: 3, bar: 4, baz: 7 };
+    const result = u({ foo: inc, bar: inc }, object);
 
     expect(result).to.deep.equal({ foo: 4, bar: 5, baz: 7 });
   });
 
   it('can be partially applied', () => {
     const inc = (i) => i + 1;
-    const obj = { foo: 3 };
+    const object = { foo: 3 };
     const incFoo = u({ foo: inc });
 
-    const result = incFoo(obj);
+    const result = incFoo(object);
 
     expect(result).to.deep.equal({ foo: 4 });
   });
 
   it('can update if the value is an array', () => {
-    const obj = {};
-    const result = u({ foo: [0, 1] }, obj);
+    const object = {};
+    const result = u({ foo: [0, 1] }, object);
 
     expect(result).to.deep.equal({ foo: [0, 1] });
   });
 
   it('can use withDefault to default things', () => {
-    const obj = {};
+    const object = {};
     const result = u({
       foo: u.withDefault([], { 0: 'bar' }),
-    }, obj);
+    }, object);
 
     expect(result).to.eql({ foo: ['bar'] });
   });