diff --git a/docs/README.md b/docs/README.md
index bdefa05a..a507114e 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -66,6 +66,7 @@ import ReactModal from 'react-modal';
   className="ReactModal__Content"
   /*
      String className to be applied to the document.body (must be a constant string).
+     This attribute when set as `null` doesn't add any class to document.body.
      See the `Styles` section for more details.
   */
   bodyOpenClassName="ReactModal__Body--open"
diff --git a/docs/styles/classes.md b/docs/styles/classes.md
index 717c6016..4b38d496 100644
--- a/docs/styles/classes.md
+++ b/docs/styles/classes.md
@@ -48,6 +48,8 @@ require a complex system to manage which class name should be added to or
 removed from `document.body` from which modal (if using multiple modals
 simultaneously).  The default value is `ReactModal__Body--open`.
 
+`bodyOpenClassName` when set as `null` doesn't add any class to `document.body`.
+
 `bodyOpenClassName` can support adding multiple classes to `document.body` when
 the modal is open. Add as many class names as you desire, delineated by spaces.
 
diff --git a/package-lock.json b/package-lock.json
index 333c65db..a6b81655 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27,9 +27,9 @@
       },
       "dependencies": {
         "jsesc": {
-          "version": "2.5.1",
-          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.1.tgz",
-          "integrity": "sha1-5CGiqOINawgZ3yiQj3glJrlt0f4=",
+          "version": "2.5.2",
+          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.2.tgz",
+          "integrity": "sha512-OYu7XEzjkCQ3C5Ps3QIZsQfNpqoJyZZA99wd9aWd05NCtC5pWOkShK2mkL6HXQR6/Cy2lbNdPlZBpuQHXE63gA==",
           "dev": true
         }
       }
@@ -94,6 +94,12 @@
             "supports-color": "^5.3.0"
           }
         },
+        "js-tokens": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-3.0.2.tgz",
+          "integrity": "sha1-mGbfOVECEw449/mWvOtlRDIJwls=",
+          "dev": true
+        },
         "supports-color": {
           "version": "5.5.0",
           "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
@@ -150,18 +156,18 @@
           "dev": true
         },
         "debug": {
-          "version": "3.2.5",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.5.tgz",
-          "integrity": "sha512-D61LaDQPQkxJ5AUM2mbSJRbPkNs/TmdmOeLAi1hgDkpDfIfetSrjmWhccwtuResSwMbACjx/xXQofvM9CE/aeg==",
+          "version": "3.2.6",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
+          "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
           "dev": true,
           "requires": {
             "ms": "^2.1.1"
           }
         },
         "globals": {
-          "version": "11.7.0",
-          "resolved": "https://registry.npmjs.org/globals/-/globals-11.7.0.tgz",
-          "integrity": "sha512-K8BNSPySfeShBQXsahYB/AbbWruVOTyVpgoIDnl8odPpeSfP2J5QO2oLFFdl2j7GfDCtZj2bMKar2T49itTPCg==",
+          "version": "11.9.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-11.9.0.tgz",
+          "integrity": "sha512-5cJVtyXWH8PiJPVLZzzoIizXx944O4OmRro5MWKx5fT4MgcN7OfaMutPeaTdJCCURwbWdhhcCWcKIffPnmTzBg==",
           "dev": true
         },
         "ms": {
@@ -309,7 +315,7 @@
     },
     "ansi-escapes": {
       "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
+      "resolved": "http://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
       "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
       "dev": true
     },
@@ -351,9 +357,9 @@
       }
     },
     "aria-query": {
-      "version": "0.7.1",
-      "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-0.7.1.tgz",
-      "integrity": "sha1-Jsu1r/ZBRLCoJb4YRuCxbPoAsR4=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-3.0.0.tgz",
+      "integrity": "sha1-ZbP8wcoRVajJrmTW7uKX8V1RM8w=",
       "dev": true,
       "requires": {
         "ast-types-flow": "0.0.7",
@@ -400,9 +406,9 @@
       "dev": true
     },
     "array-flatten": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-2.1.1.tgz",
-      "integrity": "sha1-Qmu52oQJDBg42BLIFQryCoMx4pY=",
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-2.1.2.tgz",
+      "integrity": "sha512-hNfzcOV8W4NdualtqBFPyVO+54DSJuZGY9qT4pRroB6S9e3iiido2ISIC5h9R2sPJ8H3FHCIiEnsv1lPXO3KtQ==",
       "dev": true
     },
     "array-from": {
@@ -466,17 +472,6 @@
       "integrity": "sha1-8zshWfBTKj8xB6JywMz70a0peco=",
       "dev": true
     },
-    "arrify": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
-      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
-      "dev": true
-    },
-    "asap": {
-      "version": "2.0.6",
-      "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz",
-      "integrity": "sha1-5QNHYR1+aQlDIIu9r+vLwvuGbUY="
-    },
     "asn1": {
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
@@ -514,7 +509,7 @@
         },
         "util": {
           "version": "0.10.3",
-          "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
+          "resolved": "http://registry.npmjs.org/util/-/util-0.10.3.tgz",
           "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
           "dev": true,
           "requires": {
@@ -543,7 +538,7 @@
     },
     "async": {
       "version": "1.5.2",
-      "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
+      "resolved": "http://registry.npmjs.org/async/-/async-1.5.2.tgz",
       "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
       "dev": true
     },
@@ -578,9 +573,9 @@
       "dev": true
     },
     "axobject-query": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/axobject-query/-/axobject-query-0.1.0.tgz",
-      "integrity": "sha1-YvWdvFnJ+SQnWco0mWDnov48NsA=",
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/axobject-query/-/axobject-query-2.0.2.tgz",
+      "integrity": "sha512-MCeek8ZH7hKyO1rWUbKNQBbl4l2eY0ntk7OGi+q0RlafrCnfPxC06WZA+uebCfmYp4mNU9jRBP1AhGyf8+W3ww==",
       "dev": true,
       "requires": {
         "ast-types-flow": "0.0.7"
@@ -618,12 +613,20 @@
         "chalk": "^1.1.3",
         "esutils": "^2.0.2",
         "js-tokens": "^3.0.2"
+      },
+      "dependencies": {
+        "js-tokens": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-3.0.2.tgz",
+          "integrity": "sha1-mGbfOVECEw449/mWvOtlRDIJwls=",
+          "dev": true
+        }
       }
     },
     "babel-core": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.26.0.tgz",
-      "integrity": "sha1-rzL3izGm/O8RnIew/Y2XU/A6C7g=",
+      "version": "6.26.3",
+      "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.26.3.tgz",
+      "integrity": "sha512-6jyFLuDmeidKmUEb3NM+/yawG0M2bDZ9Z1qbZP59cyHLz8kYGKYwpJP0UwUKKUiTRNvxfLesJnTedqczP7cTDA==",
       "dev": true,
       "requires": {
         "babel-code-frame": "^6.26.0",
@@ -636,28 +639,28 @@
         "babel-traverse": "^6.26.0",
         "babel-types": "^6.26.0",
         "babylon": "^6.18.0",
-        "convert-source-map": "^1.5.0",
-        "debug": "^2.6.8",
+        "convert-source-map": "^1.5.1",
+        "debug": "^2.6.9",
         "json5": "^0.5.1",
         "lodash": "^4.17.4",
         "minimatch": "^3.0.4",
         "path-is-absolute": "^1.0.1",
-        "private": "^0.1.7",
+        "private": "^0.1.8",
         "slash": "^1.0.0",
-        "source-map": "^0.5.6"
+        "source-map": "^0.5.7"
       }
     },
     "babel-eslint": {
-      "version": "8.2.3",
-      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-8.2.3.tgz",
-      "integrity": "sha512-0HeSTtaXg/Em7FCUWxwOT+KeFSO1O7LuRuzhk7g+1BjwdlQGlHq4OyMi3GqGxrNfEq8jEi6Hmt5ylEQUhurgiQ==",
+      "version": "8.2.6",
+      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-8.2.6.tgz",
+      "integrity": "sha512-aCdHjhzcILdP8c9lej7hvXKvQieyRt20SF102SIGyY4cUIiw6UaAtK4j2o3dXX74jEmy0TJ0CEhv4fTIM3SzcA==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "7.0.0-beta.44",
         "@babel/traverse": "7.0.0-beta.44",
         "@babel/types": "7.0.0-beta.44",
         "babylon": "7.0.0-beta.44",
-        "eslint-scope": "~3.7.1",
+        "eslint-scope": "3.7.1",
         "eslint-visitor-keys": "^1.0.0"
       },
       "dependencies": {
@@ -857,9 +860,9 @@
       }
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     "babel-loader": {
-      "version": "7.1.4",
-      "resolved": "http://registry.npmjs.org/babel-loader/-/babel-loader-7.1.4.tgz",
-      "integrity": "sha512-/hbyEvPzBJuGpk9o80R0ZyTej6heEOr59GoEUtn8qFKbnx4cJm9FWES6J/iv644sYgrtVw9JJQkjaLW/bqb5gw==",
+      "version": "7.1.5",
+      "resolved": "https://registry.npmjs.org/babel-loader/-/babel-loader-7.1.5.tgz",
+      "integrity": "sha512-iCHfbieL5d1LfOQeeVJEUyD9rTwBcP/fcEbRCfempxTDuqrKpu0AZjLAQHEQa3Yqyj9ORKe2iHfoj4rHLf7xpw==",
       "dev": true,
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@@ -1342,9 +1345,9 @@
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-      "version": "1.6.1",
-      "resolved": "https://registry.npmjs.org/babel-preset-env/-/babel-preset-env-1.6.1.tgz",
-      "integrity": "sha512-W6VIyA6Ch9ePMI7VptNn2wBM6dbG0eSz25HEiL40nQXCsXGTGZSTZu1Iap+cj3Q0S5a7T9+529l/5Bkvd+afNA==",
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/babel-preset-env/-/babel-preset-env-1.7.0.tgz",
+      "integrity": "sha512-9OR2afuKDneX2/q2EurSftUYM0xGu4O2D9adAhVfADDhrYDaxXV0rBbevVYoY9n6nyX1PmQW/0jtpJvUNr9CHg==",
       "dev": true,
       "requires": {
         "babel-plugin-check-es2015-constants": "^6.22.0",
@@ -1374,7 +1377,7 @@
         "babel-plugin-transform-es2015-unicode-regex": "^6.22.0",
         "babel-plugin-transform-exponentiation-operator": "^6.22.0",
         "babel-plugin-transform-regenerator": "^6.22.0",
-        "browserslist": "^2.1.2",
+        "browserslist": "^3.2.6",
         "invariant": "^2.2.2",
         "semver": "^5.3.0"
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@@ -1614,7 +1617,6 @@
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       "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
       "dev": true,
-      "optional": true,
       "requires": {
         "tweetnacl": "^0.14.3"
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@@ -1642,14 +1644,14 @@
     },
     "blob": {
       "version": "0.0.4",
-      "resolved": "https://registry.npmjs.org/blob/-/blob-0.0.4.tgz",
+      "resolved": "http://registry.npmjs.org/blob/-/blob-0.0.4.tgz",
       "integrity": "sha1-vPEwUspURj8w+fx+lbmkdjCpSSE=",
       "dev": true
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     "bluebird": {
-      "version": "3.5.2",
-      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.2.tgz",
-      "integrity": "sha512-dhHTWMI7kMx5whMQntl7Vr9C6BvV10lFXDAasnqnrMYhXVCzzk6IO9Fo2L75jXHT07WrOngL1WDXOp+yYS91Yg==",
+      "version": "3.5.3",
+      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.3.tgz",
+      "integrity": "sha512-/qKPUQlaW1OyR51WeCPBvRnAlnZFUJkCSG5HzGnuIqhgyJtF+T94lFnn33eiazjRm2LAHVy2guNnaq48X9SJuw==",
       "dev": true
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@@ -1709,19 +1711,11 @@
     },
     "boom": {
       "version": "2.10.1",
-      "resolved": "https://registry.npmjs.org/boom/-/boom-2.10.1.tgz",
+      "resolved": "http://registry.npmjs.org/boom/-/boom-2.10.1.tgz",
       "integrity": "sha1-OciRjO/1eZ+D+UkqhI9iWt0Mdm8=",
       "dev": true,
       "requires": {
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-          "resolved": "https://registry.npmjs.org/hoek/-/hoek-2.16.3.tgz",
-          "integrity": "sha1-ILt0A9POo5jpHcRxCo/xuCdKJe0=",
-          "dev": true
-        }
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     "brace-expansion": {
@@ -1829,13 +1823,13 @@
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-      "version": "2.11.3",
-      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-2.11.3.tgz",
-      "integrity": "sha512-yWu5cXT7Av6mVwzWc8lMsJMHWn4xyjSuGYi4IozbVTLUOEYPSagUB8kiMDUHA1fS3zjr8nkxkn9jdvug4BBRmA==",
+      "version": "3.2.8",
+      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-3.2.8.tgz",
+      "integrity": "sha512-WHVocJYavUwVgVViC0ORikPHQquXwVh939TaelZ4WDqpWgTX/FsGhl/+P4qBUAGcRvtOgDgC+xftNWWp2RUTAQ==",
       "dev": true,
       "requires": {
-        "caniuse-lite": "^1.0.30000792",
-        "electron-to-chromium": "^1.3.30"
+        "caniuse-lite": "^1.0.30000844",
+        "electron-to-chromium": "^1.3.47"
       }
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     "buffer": {
@@ -1949,7 +1943,7 @@
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     "callsites": {
       "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz",
+      "resolved": "http://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz",
       "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
       "dev": true
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@@ -1961,7 +1955,7 @@
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       "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/camelcase-keys/-/camelcase-keys-2.1.0.tgz",
+      "resolved": "http://registry.npmjs.org/camelcase-keys/-/camelcase-keys-2.1.0.tgz",
       "integrity": "sha1-MIvur/3ygRkFHvodkyITyRuPkuc=",
       "dev": true,
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@@ -1970,9 +1964,9 @@
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-      "version": "1.0.30000887",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30000887.tgz",
-      "integrity": "sha512-AHpONWuGFWO8yY9igdXH94tikM6ERS84286r0cAMAXYFtJBk76lhiMhtCxBJNBZsD6hzlvpWZ2AtbVFEkf4JQA==",
+      "version": "1.0.30000914",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30000914.tgz",
+      "integrity": "sha512-qqj0CL1xANgg6iDOybiPTIxtsmAnfIky9mBC35qgWrnK4WwmhqfpmkDYMYgwXJ8LRZ3/2jXlCntulO8mBaAgSg==",
       "dev": true
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@@ -2168,9 +2162,9 @@
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-      "version": "2.18.0",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.18.0.tgz",
-      "integrity": "sha512-6CYPa+JP2ftfRU2qkDK+UTVeQYosOg/2GbcjIcKPHfinyOLPVGXu/ovN86RP49Re5ndJK1N0kuiidFFuepc4ZQ==",
+      "version": "2.19.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.19.0.tgz",
+      "integrity": "sha512-6tvAOO+D6OENvRAh524Dh9jcfKTYDQAqvqezbCW82xj5X0pSrcpxtvRKHLG0yBY6SD7PSDrJaj+0AiOcKVd1Xg==",
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@@ -2330,9 +2324,9 @@
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-      "version": "2.5.7",
-      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.5.7.tgz",
-      "integrity": "sha512-RszJCAxg/PP6uzXVXL6BsxSXx/B05oJAQ2vkJRjyjrEcNVycaqOmNb5OTxZPE3xa5gwZduqza6L9JOCenh/Ecw==",
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.6.0.tgz",
+      "integrity": "sha512-kLRC6ncVpuEW/1kwrOXYX6KQASCVtrh1gQr/UiaVgFlf9WE5Vp+lNe5+h3LuMr5PAucWnnEXwH0nQHRH/gpGtw==",
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@@ -2359,40 +2353,6 @@
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-          "version": "2.79.0",
-          "resolved": "http://registry.npmjs.org/request/-/request-2.79.0.tgz",
-          "integrity": "sha1-Tf5b9r6LjNw3/Pk+BLZVd3InEN4=",
-          "dev": true,
-          "requires": {
-            "aws-sign2": "~0.6.0",
-            "aws4": "^1.2.1",
-            "caseless": "~0.11.0",
-            "combined-stream": "~1.0.5",
-            "extend": "~3.0.0",
-            "forever-agent": "~0.6.1",
-            "form-data": "~2.1.1",
-            "har-validator": "~2.0.6",
-            "hawk": "~3.1.3",
-            "http-signature": "~1.1.0",
-            "is-typedarray": "~1.0.0",
-            "isstream": "~0.1.2",
-            "json-stringify-safe": "~5.0.1",
-            "mime-types": "~2.1.7",
-            "oauth-sign": "~0.8.1",
-            "qs": "~6.3.0",
-            "stringstream": "~0.0.4",
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-          "version": "3.3.2",
-          "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
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-          "dev": true
         }
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@@ -2434,29 +2394,31 @@
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-      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-5.1.4.tgz",
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+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.2.tgz",
+      "integrity": "sha512-qky9CVt0lVIECkEsYbNILVnPvycuEBkXoMFLRWsREkomQLevYhtRKC+R91a5TOAQ3bCMjikRwhyaRqj1VYatYg==",
       "dev": true
     },
     "spdy": {
@@ -13791,9 +13640,9 @@
       }
     },
     "spdy-transport": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/spdy-transport/-/spdy-transport-2.1.0.tgz",
-      "integrity": "sha512-bpUeGpZcmZ692rrTiqf9/2EUakI6/kXX1Rpe0ib/DyOzbiexVfXkw6GnvI9hVGvIwVaUhkaBojjCZwLNRGQg1g==",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/spdy-transport/-/spdy-transport-2.1.1.tgz",
+      "integrity": "sha512-q7D8c148escoB3Z7ySCASadkegMmUZW8Wb/Q1u0/XBgDKMO880rLQDj8Twiew/tYi7ghemKUi/whSYOwE17f5Q==",
       "dev": true,
       "requires": {
         "debug": "^2.6.8",
@@ -13805,15 +13654,6 @@
         "wbuf": "^1.7.2"
       }
     },
-    "split": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/split/-/split-1.0.1.tgz",
-      "integrity": "sha512-mTyOoPbrivtXnwnIxZRFYRrPNtEFKlpB2fvjSnCQUiAA6qAZzqwna5envK4uk6OIeP17CsdF3rSBGYVBsU0Tkg==",
-      "dev": true,
-      "requires": {
-        "through": "2"
-      }
-    },
     "split-string": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/split-string/-/split-string-3.1.0.tgz",
@@ -13830,9 +13670,9 @@
       "dev": true
     },
     "sshpk": {
-      "version": "1.14.2",
-      "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.14.2.tgz",
-      "integrity": "sha1-xvxhZIo9nE52T9P8306hBeSSupg=",
+      "version": "1.15.2",
+      "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.15.2.tgz",
+      "integrity": "sha512-Ra/OXQtuh0/enyl4ETZAfTaeksa6BXks5ZcjpSUNrjBr0DvrJKX+1fsKDPpT9TBXgHAFsa4510aNVgI8g/+SzA==",
       "dev": true,
       "requires": {
         "asn1": "~0.2.3",
@@ -13883,7 +13723,7 @@
     },
     "stream-browserify": {
       "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/stream-browserify/-/stream-browserify-2.0.1.tgz",
+      "resolved": "http://registry.npmjs.org/stream-browserify/-/stream-browserify-2.0.1.tgz",
       "integrity": "sha1-ZiZu5fm9uZQKTkUUyvtDu3Hlyds=",
       "dev": true,
       "requires": {
@@ -13891,16 +13731,6 @@
         "readable-stream": "^2.0.2"
       }
     },
-    "stream-combiner": {
-      "version": "0.2.2",
-      "resolved": "http://registry.npmjs.org/stream-combiner/-/stream-combiner-0.2.2.tgz",
-      "integrity": "sha1-rsjLrBd7Vrb0+kec7YwZEs7lKFg=",
-      "dev": true,
-      "requires": {
-        "duplexer": "~0.1.1",
-        "through": "~2.3.4"
-      }
-    },
     "stream-http": {
       "version": "2.8.3",
       "resolved": "https://registry.npmjs.org/stream-http/-/stream-http-2.8.3.tgz",
@@ -13954,7 +13784,7 @@
     },
     "string_decoder": {
       "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
       "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
       "dev": true,
       "requires": {
@@ -13969,7 +13799,7 @@
     },
     "strip-ansi": {
       "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
       "dev": true,
       "requires": {
@@ -13984,7 +13814,7 @@
     },
     "strip-eof": {
       "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
+      "resolved": "http://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
       "dev": true
     },
@@ -14070,7 +13900,7 @@
     },
     "text-encoding": {
       "version": "0.6.4",
-      "resolved": "https://registry.npmjs.org/text-encoding/-/text-encoding-0.6.4.tgz",
+      "resolved": "http://registry.npmjs.org/text-encoding/-/text-encoding-0.6.4.tgz",
       "integrity": "sha1-45mpgiV6J22uQou5KEXLcb3CbRk=",
       "dev": true
     },
@@ -14087,15 +13917,15 @@
       "dev": true
     },
     "thunky": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/thunky/-/thunky-1.0.2.tgz",
-      "integrity": "sha1-qGLgGOP7HqLsP85dVWBc9X8kc3E=",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/thunky/-/thunky-1.0.3.tgz",
+      "integrity": "sha512-YwT8pjmNcAXBZqrubu22P4FYsh2D4dxRmnWBOL8Jk8bUcRUtc5326kx32tuTmFDAZtLOGEVNl8POAR8j896Iow==",
       "dev": true
     },
     "time-stamp": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/time-stamp/-/time-stamp-2.1.0.tgz",
-      "integrity": "sha512-lJbq6KsFhZJtN3fPUVje1tq/hHsJOKUUcUj/MGCiQR6qWBDcyi5kxL9J7/RnaEChCn0+L/DUN2WvemDrkk4i3Q==",
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/time-stamp/-/time-stamp-2.2.0.tgz",
+      "integrity": "sha512-zxke8goJQpBeEgD82CXABeMh0LSJcj7CXEd0OHOg45HgcofF7pxNwZm9+RknpxpDhwN4gFpySkApKfFYfRQnUA==",
       "dev": true
     },
     "timers-browserify": {
@@ -14178,7 +14008,7 @@
     },
     "tough-cookie": {
       "version": "2.3.4",
-      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
+      "resolved": "http://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
       "integrity": "sha512-TZ6TTfI5NtZnuyy/Kecv+CnoROnyXn2DN97LontgQpCwsX2XyLYCC0ENhYkehSOwAp8rTQKc/NUIF7BkQ5rKLA==",
       "dev": true,
       "requires": {
@@ -14213,8 +14043,7 @@
       "version": "0.14.5",
       "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
       "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-      "dev": true,
-      "optional": true
+      "dev": true
     },
     "type-check": {
       "version": "0.3.2",
@@ -14247,11 +14076,6 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
-    "ua-parser-js": {
-      "version": "0.7.18",
-      "resolved": "https://registry.npmjs.org/ua-parser-js/-/ua-parser-js-0.7.18.tgz",
-      "integrity": "sha512-LtzwHlVHwFGTptfNSgezHp7WUlwiqb0gA9AALRbKaERfxwJoiX0A73QbTToxteIAuIaFshhgIZfqK8s7clqgnA=="
-    },
     "uglify-js": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.1.1.tgz",
@@ -14472,9 +14296,9 @@
       }
     },
     "url-parse": {
-      "version": "1.4.3",
-      "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.4.3.tgz",
-      "integrity": "sha512-rh+KuAW36YKo0vClhQzLLveoj8FwPJNu65xLb7Mrt+eZht0IPT0IXgSv8gcMegZ6NvjJUALf6Mf25POlMwD1Fw==",
+      "version": "1.4.4",
+      "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.4.4.tgz",
+      "integrity": "sha512-/92DTTorg4JjktLNLe6GPS2/RvAd/RGr6LuktmWSMLEOa6rjnlrFXNgSbSmkNvCoL2T028A0a1JaJLzRMlFoHg==",
       "dev": true,
       "requires": {
         "querystringify": "^2.0.0",
@@ -14525,9 +14349,9 @@
       "dev": true
     },
     "uuid": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
-      "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho=",
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
+      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
       "dev": true
     },
     "v8flags": {
@@ -14967,9 +14791,9 @@
       }
     },
     "webpack": {
-      "version": "3.11.0",
-      "resolved": "http://registry.npmjs.org/webpack/-/webpack-3.11.0.tgz",
-      "integrity": "sha512-3kOFejWqj5ISpJk4Qj/V7w98h9Vl52wak3CLiw/cDOfbVTq7FeoZ0SdoHHY9PYlHr50ZS42OfvzE2vB4nncKQg==",
+      "version": "3.12.0",
+      "resolved": "https://registry.npmjs.org/webpack/-/webpack-3.12.0.tgz",
+      "integrity": "sha512-Sw7MdIIOv/nkzPzee4o0EdvCuPmxT98+vVpIvwtcwcF1Q4SDSNp92vwcKc4REe7NItH9f1S4ra9FuQ7yuYZ8bQ==",
       "dev": true,
       "requires": {
         "acorn": "^5.0.0",
@@ -14997,9 +14821,9 @@
       },
       "dependencies": {
         "ajv": {
-          "version": "6.5.4",
-          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.5.4.tgz",
-          "integrity": "sha512-4Wyjt8+t6YszqaXnLDfMmG/8AlO5Zbcsy3ATHncCzjW/NoPzAId8AK6749Ybjmdt+kUY1gP60fCu46oDxPv/mg==",
+          "version": "6.6.1",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.6.1.tgz",
+          "integrity": "sha512-ZoJjft5B+EJBjUyu9C9Hc0OZyPZSSlOF+plzouTrg6UlA8f+e/n8NIgBFG/9tppJtpPWfthHakK7juJdNDODww==",
           "dev": true,
           "requires": {
             "fast-deep-equal": "^2.0.1",
@@ -15073,9 +14897,9 @@
           }
         },
         "tapable": {
-          "version": "0.2.8",
-          "resolved": "https://registry.npmjs.org/tapable/-/tapable-0.2.8.tgz",
-          "integrity": "sha1-mTcqXJmb8t8WCvwNdL7U9HlIzSI=",
+          "version": "0.2.9",
+          "resolved": "https://registry.npmjs.org/tapable/-/tapable-0.2.9.tgz",
+          "integrity": "sha512-2wsvQ+4GwBvLPLWsNfLCDYGsW6xb7aeC6utq2Qh0PFwgEy7K7dsma9Jsmb2zSQj7GvYAyUGSntLtsv++GmgL1A==",
           "dev": true
         }
       }
@@ -15154,20 +14978,6 @@
             "wrap-ansi": "^2.0.0"
           }
         },
-        "del": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/del/-/del-3.0.0.tgz",
-          "integrity": "sha1-U+z2mf/LyzljdpGrE7rxYIGXZuU=",
-          "dev": true,
-          "requires": {
-            "globby": "^6.1.0",
-            "is-path-cwd": "^1.0.0",
-            "is-path-in-cwd": "^1.0.0",
-            "p-map": "^1.1.1",
-            "pify": "^3.0.0",
-            "rimraf": "^2.2.8"
-          }
-        },
         "find-up": {
           "version": "1.1.2",
           "resolved": "https://registry.npmjs.org/find-up/-/find-up-1.1.2.tgz",
@@ -15178,27 +14988,6 @@
             "pinkie-promise": "^2.0.0"
           }
         },
-        "globby": {
-          "version": "6.1.0",
-          "resolved": "https://registry.npmjs.org/globby/-/globby-6.1.0.tgz",
-          "integrity": "sha1-9abXDoOV4hyFj7BInWTfAkJNUGw=",
-          "dev": true,
-          "requires": {
-            "array-union": "^1.0.1",
-            "glob": "^7.0.3",
-            "object-assign": "^4.0.1",
-            "pify": "^2.0.0",
-            "pinkie-promise": "^2.0.0"
-          },
-          "dependencies": {
-            "pify": {
-              "version": "2.3.0",
-              "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
-              "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
-              "dev": true
-            }
-          }
-        },
         "has-flag": {
           "version": "2.0.0",
           "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-2.0.0.tgz",
@@ -15225,14 +15014,6 @@
             "pify": "^2.0.0",
             "pinkie-promise": "^2.0.0",
             "strip-bom": "^2.0.0"
-          },
-          "dependencies": {
-            "pify": {
-              "version": "2.3.0",
-              "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
-              "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
-              "dev": true
-            }
           }
         },
         "os-locale": {
@@ -15262,16 +15043,14 @@
             "graceful-fs": "^4.1.2",
             "pify": "^2.0.0",
             "pinkie-promise": "^2.0.0"
-          },
-          "dependencies": {
-            "pify": {
-              "version": "2.3.0",
-              "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
-              "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
-              "dev": true
-            }
           }
         },
+        "pify": {
+          "version": "2.3.0",
+          "resolved": "http://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
+          "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
+          "dev": true
+        },
         "read-pkg": {
           "version": "1.1.0",
           "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-1.1.0.tgz",
@@ -15351,7 +15130,7 @@
         },
         "yargs-parser": {
           "version": "4.2.1",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-4.2.1.tgz",
+          "resolved": "http://registry.npmjs.org/yargs-parser/-/yargs-parser-4.2.1.tgz",
           "integrity": "sha1-KczqwNxPA8bIe0qfIX3RjJ90hxw=",
           "dev": true,
           "requires": {
@@ -15394,11 +15173,6 @@
       "integrity": "sha512-nqHUnMXmBzT0w570r2JpJxfiSD1IzoI+HGVdd3aZ0yNi3ngvQ4jv1dtHt5VGxfI2yj5yqImPhOK4vmIh2xMbGg==",
       "dev": true
     },
-    "whatwg-fetch": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-3.0.0.tgz",
-      "integrity": "sha512-9GSJUgz1D4MfyKU7KRqwOjXCXTqWdFNvEr7eUBYchQiVc744mqK/MzXPNR2WsPkmkOa4ywfg8C2n8h+13Bey1Q=="
-    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
diff --git a/specs/Modal.spec.js b/specs/Modal.spec.js
index cf3d3d44..87e2613c 100644
--- a/specs/Modal.spec.js
+++ b/specs/Modal.spec.js
@@ -14,7 +14,8 @@ import {
   escKeyDown,
   renderModal,
   unmountModal,
-  emptyDOM
+  emptyDOM,
+  documentBodyClassList
 } from "./helper";
 
 export default () => {
@@ -301,6 +302,12 @@ export default () => {
     isBodyWithReactModalOpenClass().should.not.be.ok();
   });
 
+  // eslint-disable-next-line max-len
+  it("don't append any class to document.body when bodyOpenClassName is null.", () => {
+    renderModal({ isOpen: true, bodyOpenClassName: null });
+    documentBodyClassList().should.be.empty();
+  });
+
   it("don't append class to <html /> if modal is closed.", () => {
     renderModal({ isOpen: false, htmlOpenClassName: "custom-modal-open" });
     isHtmlWithReactModalOpenClass().should.not.be.ok();
diff --git a/src/components/ModalPortal.js b/src/components/ModalPortal.js
index 4d852193..4b37fef5 100644
--- a/src/components/ModalPortal.js
+++ b/src/components/ModalPortal.js
@@ -135,7 +135,7 @@ export default class ModalPortal extends Component {
     } = this.props;
 
     // Add classes.
-    classList.add(document.body, bodyOpenClassName);
+    bodyOpenClassName && classList.add(document.body, bodyOpenClassName);
 
     htmlOpenClassName &&
       classList.add(
@@ -158,7 +158,7 @@ export default class ModalPortal extends Component {
     } = this.props;
 
     // Remove classes.
-    classList.remove(document.body, bodyOpenClassName);
+    bodyOpenClassName && classList.remove(document.body, bodyOpenClassName);
 
     htmlOpenClassName &&
       classList.remove(