diff --git a/modules/history.js b/modules/history.js
index 4781d5a6c4..83acc3c58e 100644
--- a/modules/history.js
+++ b/modules/history.js
@@ -1,5 +1,4 @@
 import { Scope } from 'parchment';
-import Delta, { Op } from 'quill-delta';
 import Quill from '../core/quill';
 import Module from '../core/module';
 
@@ -39,12 +38,14 @@ class History extends Module {
   change(source, dest) {
     if (this.stack[source].length === 0) return;
     const delta = this.stack[source].pop();
-    this.stack[dest].push(delta);
+    const base = this.quill.getContents();
+    const inverseDelta = delta.invert(base);
+    this.stack[dest].push(inverseDelta);
     this.lastRecorded = 0;
     this.ignoreChange = true;
-    this.quill.updateContents(delta[source], Quill.sources.USER);
+    this.quill.updateContents(delta, Quill.sources.USER);
     this.ignoreChange = false;
-    const index = getLastChangeIndex(this.quill.scroll, delta[source]);
+    const index = getLastChangeIndex(this.quill.scroll, delta);
     this.quill.setSelection(index);
   }
 
@@ -59,25 +60,19 @@ class History extends Module {
   record(changeDelta, oldDelta) {
     if (changeDelta.ops.length === 0) return;
     this.stack.redo = [];
-    let undoDelta = guessUndoDelta(changeDelta);
-    if (undoDelta == null) {
-      undoDelta = this.quill.getContents().diff(oldDelta);
-    }
+    let undoDelta = changeDelta.invert(oldDelta);
     const timestamp = Date.now();
     if (
       this.lastRecorded + this.options.delay > timestamp &&
       this.stack.undo.length > 0
     ) {
       const delta = this.stack.undo.pop();
-      undoDelta = undoDelta.compose(delta.undo);
-      changeDelta = delta.redo.compose(changeDelta);
+      undoDelta = undoDelta.compose(delta);
     } else {
       this.lastRecorded = timestamp;
     }
-    this.stack.undo.push({
-      redo: changeDelta,
-      undo: undoDelta,
-    });
+    if (undoDelta.length() === 0) return;
+    this.stack.undo.push(undoDelta);
     if (this.stack.undo.length > this.options.maxStack) {
       this.stack.undo.shift();
     }
@@ -88,14 +83,8 @@ class History extends Module {
   }
 
   transform(delta) {
-    this.stack.undo.forEach(change => {
-      change.undo = delta.transform(change.undo, true);
-      change.redo = delta.transform(change.redo, true);
-    });
-    this.stack.redo.forEach(change => {
-      change.undo = delta.transform(change.undo, true);
-      change.redo = delta.transform(change.redo, true);
-    });
+    transformStack(this.stack.undo, delta);
+    transformStack(this.stack.redo, delta);
   }
 
   undo() {
@@ -108,6 +97,18 @@ History.DEFAULTS = {
   userOnly: false,
 };
 
+function transformStack(stack, delta) {
+  let remoteDelta = delta;
+  for (let i = stack.length - 1; i >= 0; i -= 1) {
+    const oldDelta = stack[i];
+    stack[i] = remoteDelta.transform(oldDelta, true);
+    remoteDelta = oldDelta.transform(remoteDelta);
+    if (stack[i].length() === 0) {
+      stack.splice(i, 1);
+    }
+  }
+}
+
 function endsWithNewlineChange(scroll, delta) {
   const lastOp = delta.ops[delta.ops.length - 1];
   if (lastOp == null) return false;
@@ -133,21 +134,4 @@ function getLastChangeIndex(scroll, delta) {
   return changeIndex;
 }
 
-function guessUndoDelta(delta) {
-  const undoDelta = new Delta();
-  let failed = false;
-  delta.forEach(op => {
-    if (op.insert) {
-      undoDelta.delete(Op.length(op));
-    } else if (op.retain && op.attributes == null) {
-      undoDelta.retain(op.retain);
-    } else {
-      failed = true;
-      return false;
-    }
-    return true;
-  });
-  return failed ? null : undoDelta;
-}
-
 export { History as default, getLastChangeIndex };
diff --git a/package-lock.json b/package-lock.json
index aebd6ae701..8aa96c56bd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -330,9 +330,9 @@
       }
     },
     "@babel/plugin-proposal-object-rest-spread": {
-      "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-object-rest-spread/-/plugin-proposal-object-rest-spread-7.2.0.tgz",
-      "integrity": "sha512-1L5mWLSvR76XYUQJXkd/EEQgjq8HHRP6lQuZTTg0VA4tTGPpGemmCdAfQIz1rzEuWAm+ecP8PyyEm30jC1eQCg==",
+      "version": "7.3.2",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-object-rest-spread/-/plugin-proposal-object-rest-spread-7.3.2.tgz",
+      "integrity": "sha512-DjeMS+J2+lpANkYLLO+m6GjoTMygYglKmRe6cDTbFv3L9i6mmiE8fe6B8MtCSLZpVXscD5kn7s6SgtHrDoBWoA==",
       "dev": true,
       "requires": {
         "@babel/helper-plugin-utils": "^7.0.0",
@@ -465,14 +465,6 @@
         "@babel/helper-replace-supers": "^7.1.0",
         "@babel/helper-split-export-declaration": "^7.0.0",
         "globals": "^11.1.0"
-      },
-      "dependencies": {
-        "globals": {
-          "version": "11.9.0",
-          "resolved": "https://registry.npmjs.org/globals/-/globals-11.9.0.tgz",
-          "integrity": "sha512-5cJVtyXWH8PiJPVLZzzoIizXx944O4OmRro5MWKx5fT4MgcN7OfaMutPeaTdJCCURwbWdhhcCWcKIffPnmTzBg==",
-          "dev": true
-        }
       }
     },
     "@babel/plugin-transform-computed-properties": {
@@ -485,9 +477,9 @@
       }
     },
     "@babel/plugin-transform-destructuring": {
-      "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-destructuring/-/plugin-transform-destructuring-7.2.0.tgz",
-      "integrity": "sha512-coVO2Ayv7g0qdDbrNiadE4bU7lvCd9H539m2gMknyVjjMdwF/iCOM7R+E8PkntoqLkltO0rk+3axhpp/0v68VQ==",
+      "version": "7.3.2",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-destructuring/-/plugin-transform-destructuring-7.3.2.tgz",
+      "integrity": "sha512-Lrj/u53Ufqxl/sGxyjsJ2XNtNuEjDyjpqdhMNh5aZ+XFOdThL46KBj27Uem4ggoezSYBxKWAil6Hu8HtwqesYw==",
       "dev": true,
       "requires": {
         "@babel/helper-plugin-utils": "^7.0.0"
@@ -608,6 +600,15 @@
         "@babel/helper-plugin-utils": "^7.0.0"
       }
     },
+    "@babel/plugin-transform-named-capturing-groups-regex": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-named-capturing-groups-regex/-/plugin-transform-named-capturing-groups-regex-7.3.0.tgz",
+      "integrity": "sha512-NxIoNVhk9ZxS+9lSoAQ/LM0V2UEvARLttEHUrRDGKFaAxOYQcrkN/nLRE+BbbicCAvZPl7wMP0X60HsHE5DtQw==",
+      "dev": true,
+      "requires": {
+        "regexp-tree": "^0.1.0"
+      }
+    },
     "@babel/plugin-transform-new-target": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/@babel/plugin-transform-new-target/-/plugin-transform-new-target-7.0.0.tgz",
@@ -645,17 +646,6 @@
       "dev": true,
       "requires": {
         "regenerator-transform": "^0.13.3"
-      },
-      "dependencies": {
-        "regenerator-transform": {
-          "version": "0.13.3",
-          "resolved": "https://registry.npmjs.org/regenerator-transform/-/regenerator-transform-0.13.3.tgz",
-          "integrity": "sha512-5ipTrZFSq5vU2YoGoww4uaRVAK4wyYC4TSICibbfEPOruUu8FFP7ErV0BjmbIOEpn3O/k9na9UEdYR/3m7N6uA==",
-          "dev": true,
-          "requires": {
-            "private": "^0.1.6"
-          }
-        }
       }
     },
     "@babel/plugin-transform-shorthand-properties": {
@@ -733,19 +723,20 @@
       }
     },
     "@babel/preset-env": {
-      "version": "7.2.3",
-      "resolved": "https://registry.npmjs.org/@babel/preset-env/-/preset-env-7.2.3.tgz",
-      "integrity": "sha512-AuHzW7a9rbv5WXmvGaPX7wADxFkZIqKlbBh1dmZUQp4iwiPpkE/Qnrji6SC4UQCQzvWY/cpHET29eUhXS9cLPw==",
+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/@babel/preset-env/-/preset-env-7.3.1.tgz",
+      "integrity": "sha512-FHKrD6Dxf30e8xgHQO0zJZpUPfVZg+Xwgz5/RdSWCbza9QLNk4Qbp40ctRoqDxml3O8RMzB1DU55SXeDG6PqHQ==",
       "dev": true,
       "requires": {
         "@babel/helper-module-imports": "^7.0.0",
         "@babel/helper-plugin-utils": "^7.0.0",
         "@babel/plugin-proposal-async-generator-functions": "^7.2.0",
         "@babel/plugin-proposal-json-strings": "^7.2.0",
-        "@babel/plugin-proposal-object-rest-spread": "^7.2.0",
+        "@babel/plugin-proposal-object-rest-spread": "^7.3.1",
         "@babel/plugin-proposal-optional-catch-binding": "^7.2.0",
         "@babel/plugin-proposal-unicode-property-regex": "^7.2.0",
         "@babel/plugin-syntax-async-generators": "^7.2.0",
+        "@babel/plugin-syntax-json-strings": "^7.2.0",
         "@babel/plugin-syntax-object-rest-spread": "^7.2.0",
         "@babel/plugin-syntax-optional-catch-binding": "^7.2.0",
         "@babel/plugin-transform-arrow-functions": "^7.2.0",
@@ -765,6 +756,7 @@
         "@babel/plugin-transform-modules-commonjs": "^7.2.0",
         "@babel/plugin-transform-modules-systemjs": "^7.2.0",
         "@babel/plugin-transform-modules-umd": "^7.2.0",
+        "@babel/plugin-transform-named-capturing-groups-regex": "^7.3.0",
         "@babel/plugin-transform-new-target": "^7.0.0",
         "@babel/plugin-transform-object-super": "^7.2.0",
         "@babel/plugin-transform-parameters": "^7.2.0",
@@ -779,25 +771,6 @@
         "invariant": "^2.2.2",
         "js-levenshtein": "^1.1.3",
         "semver": "^5.3.0"
-      },
-      "dependencies": {
-        "browserslist": {
-          "version": "4.3.6",
-          "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.3.6.tgz",
-          "integrity": "sha512-kMGKs4BTzRWviZ8yru18xBpx+CyHG9eqgRbj9XbE3IMgtczf4aiA0Y1YCpVdvUieKGZ03kolSPXqTcscBCb9qw==",
-          "dev": true,
-          "requires": {
-            "caniuse-lite": "^1.0.30000921",
-            "electron-to-chromium": "^1.3.92",
-            "node-releases": "^1.1.1"
-          }
-        },
-        "caniuse-lite": {
-          "version": "1.0.30000923",
-          "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30000923.tgz",
-          "integrity": "sha512-j5ur7eeluOFjjPUkydtXP4KFAsmH3XaQNch5tvWSO+dLHYt5PE+VgJZLWtbVOodfWij6m6zas28T4gB/cLYq1w==",
-          "dev": true
-        }
       }
     },
     "@babel/template": {
@@ -1071,27 +1044,16 @@
       }
     },
     "acorn": {
-      "version": "6.0.4",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.0.4.tgz",
-      "integrity": "sha512-VY4i5EKSKkofY2I+6QLTbTTN/UvEQPCo6eiwzzSaSWfpaDhOmStMCMod6wmuPciNq+XS0faCglFu2lHZpdHUtg==",
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.1.0.tgz",
+      "integrity": "sha512-MW/FjM+IvU9CgBzjO3UIPCE2pyEwUsoFl+VGdczOPEdxfGFjuKny/gN54mOuX7Qxmb9Rg9MCn2oKiSUeW+pjrw==",
       "dev": true
     },
     "acorn-dynamic-import": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/acorn-dynamic-import/-/acorn-dynamic-import-3.0.0.tgz",
-      "integrity": "sha512-zVWV8Z8lislJoOKKqdNMOB+s6+XV5WERty8MnKBeFgwA+19XJjJHs2RP5dzM57FftIs+jQnRToLiWazKr6sSWg==",
-      "dev": true,
-      "requires": {
-        "acorn": "^5.0.0"
-      },
-      "dependencies": {
-        "acorn": {
-          "version": "5.7.3",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
-          "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
-          "dev": true
-        }
-      }
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-dynamic-import/-/acorn-dynamic-import-4.0.0.tgz",
+      "integrity": "sha512-d3OEjQV4ROpoflsnUA8HozoIR504TFxNivYEUi6uwz0IYhBkTDXGuWlNdMtybRt3nqVx/L6XqMt0FxkXuWKZhw==",
+      "dev": true
     },
     "acorn-jsx": {
       "version": "5.0.1",
@@ -1179,9 +1141,9 @@
       "dev": true
     },
     "ansi-escapes": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
-      "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
+      "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
       "dev": true
     },
     "ansi-html": {
@@ -1423,12 +1385,12 @@
       }
     },
     "babel-loader": {
-      "version": "8.0.4",
-      "resolved": "https://registry.npmjs.org/babel-loader/-/babel-loader-8.0.4.tgz",
-      "integrity": "sha512-fhBhNkUToJcW9nV46v8w87AJOwAJDz84c1CL57n3Stj73FANM/b9TbCUK4YhdOwEyZ+OxhYpdeZDNzSI29Firw==",
+      "version": "8.0.5",
+      "resolved": "https://registry.npmjs.org/babel-loader/-/babel-loader-8.0.5.tgz",
+      "integrity": "sha512-NTnHnVRd2JnRqPC0vW+iOQWU5pchDbYXsG2E6DMXEpMfUcQKclF9gmf3G3ZMhzG7IG9ji4coL0cm+FxeWxDpnw==",
       "dev": true,
       "requires": {
-        "find-cache-dir": "^1.0.0",
+        "find-cache-dir": "^2.0.0",
         "loader-utils": "^1.0.2",
         "mkdirp": "^0.5.1",
         "util.promisify": "^1.0.0"
@@ -1787,6 +1749,17 @@
         "pako": "~1.0.5"
       }
     },
+    "browserslist": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.4.1.tgz",
+      "integrity": "sha512-pEBxEXg7JwaakBXjATYw/D1YZh4QUSCX/Mnd/wnqSRPPSi1U39iDhDoKGoBUcraKdxDlrYqJxSI5nNvD+dWP2A==",
+      "dev": true,
+      "requires": {
+        "caniuse-lite": "^1.0.30000929",
+        "electron-to-chromium": "^1.3.103",
+        "node-releases": "^1.1.3"
+      }
+    },
     "buffer": {
       "version": "4.9.1",
       "resolved": "https://registry.npmjs.org/buffer/-/buffer-4.9.1.tgz",
@@ -1918,15 +1891,6 @@
         "unset-value": "^1.0.0"
       }
     },
-    "caller-path": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
-      "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
-      "dev": true,
-      "requires": {
-        "callsites": "^0.2.0"
-      }
-    },
     "callsite": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/callsite/-/callsite-1.0.0.tgz",
@@ -1934,9 +1898,9 @@
       "dev": true
     },
     "callsites": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz",
-      "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.0.0.tgz",
+      "integrity": "sha512-tWnkwu9YEq2uzlBDI4RcLn8jrFvF9AOi8PxDNU3hZZjJcjkcRAq3vCI+vZcg1SuxISDYe86k9VZFwAxDiJGoAw==",
       "dev": true
     },
     "camel-case": {
@@ -1965,6 +1929,12 @@
         "map-obj": "^1.0.0"
       }
     },
+    "caniuse-lite": {
+      "version": "1.0.30000936",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30000936.tgz",
+      "integrity": "sha512-orX4IdpbFhdNO7bTBhSbahp1EBpqzBc+qrvTRVUFfZgA4zta7TdM6PN5ZxkEUgDnz36m+PfWGcdX7AVfFWItJw==",
+      "dev": true
+    },
     "center-align": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/center-align/-/center-align-0.1.3.tgz",
@@ -2086,6 +2056,17 @@
         "restore-cursor": "^2.0.0"
       }
     },
+    "cli-table3": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/cli-table3/-/cli-table3-0.5.1.tgz",
+      "integrity": "sha512-7Qg2Jrep1S/+Q3EceiZtQcDPWxhAvBw+ERf1162v4sikJrvojMHFqXt8QIVha8UlH9rgU0BeWPytZ9/TzYqlUw==",
+      "dev": true,
+      "requires": {
+        "colors": "^1.1.2",
+        "object-assign": "^4.1.0",
+        "string-width": "^2.1.1"
+      }
+    },
     "cli-width": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
@@ -2334,9 +2315,9 @@
       "dev": true
     },
     "core-js": {
-      "version": "2.6.1",
-      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.6.1.tgz",
-      "integrity": "sha512-L72mmmEayPJBejKIWe2pYtGis5r0tQ5NaJekdhyXgeMQTpJoBsH0NL4ElY2LfSoV15xeQWKQ+XTTOZdyero5Xg==",
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.6.4.tgz",
+      "integrity": "sha512-05qQ5hXShcqGkPZpXEFLIpxayZscVD2kuMBZewxiIPPEagukO4mqgPA9CWhUvFBJfy3ODdK2p9xyHh7FTU9/7A==",
       "dev": true
     },
     "core-util-is": {
@@ -2697,6 +2678,12 @@
       "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA=",
       "dev": true
     },
+    "detect-file": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/detect-file/-/detect-file-1.0.0.tgz",
+      "integrity": "sha1-8NZtA2cqglyxtzvbP+YjEMjlUrc=",
+      "dev": true
+    },
     "detect-node": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/detect-node/-/detect-node-2.0.4.tgz",
@@ -2773,9 +2760,9 @@
       "dev": true
     },
     "duplexify": {
-      "version": "3.6.1",
-      "resolved": "https://registry.npmjs.org/duplexify/-/duplexify-3.6.1.tgz",
-      "integrity": "sha512-vM58DwdnKmty+FSPzT14K9JXb90H+j5emaR4KYbr2KTIz00WHGbWOe5ghQTx233ZCLZtrGDALzKwcjEtSt35mA==",
+      "version": "3.7.1",
+      "resolved": "https://registry.npmjs.org/duplexify/-/duplexify-3.7.1.tgz",
+      "integrity": "sha512-07z8uv2wMyS51kKhD1KsdXJg5WQ6t93RneqRxUHnskXVtlYYkLqM0gqStQZ3pj073g687jPCHrqNfCzawLYh5g==",
       "dev": true,
       "requires": {
         "end-of-stream": "^1.0.0",
@@ -2791,9 +2778,9 @@
       "dev": true
     },
     "electron-to-chromium": {
-      "version": "1.3.96",
-      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.96.tgz",
-      "integrity": "sha512-ZUXBUyGLeoJxp4Nt6G/GjBRLnyz8IKQGexZ2ndWaoegThgMGFO1tdDYID5gBV32/1S83osjJHyfzvanE/8HY4Q==",
+      "version": "1.3.113",
+      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.113.tgz",
+      "integrity": "sha512-De+lPAxEcpxvqPTyZAXELNpRZXABRxf+uL/rSykstQhzj/B0l1150G/ExIIxKc16lI89Hgz81J0BHAcbTqK49g==",
       "dev": true
     },
     "elliptic": {
@@ -2812,9 +2799,9 @@
       }
     },
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@@ -8947,9 +9198,9 @@
       "dev": true
     },
     "ts-loader": {
-      "version": "5.3.2",
-      "resolved": "https://registry.npmjs.org/ts-loader/-/ts-loader-5.3.2.tgz",
-      "integrity": "sha512-TPeXFkdPjOrVEawY4xUgRnzlHEmKQF1DclJghPGq67jKnroVvs6mEGHWYtbUczgeWTvTaqUjSSaMmp1k5do4vw==",
+      "version": "5.3.3",
+      "resolved": "https://registry.npmjs.org/ts-loader/-/ts-loader-5.3.3.tgz",
+      "integrity": "sha512-KwF1SplmOJepnoZ4eRIloH/zXL195F51skt7reEsS6jvDqzgc/YSbz9b8E07GxIUwLXdcD4ssrJu6v8CwaTafA==",
       "dev": true,
       "requires": {
         "chalk": "^2.3.0",
@@ -9026,9 +9277,9 @@
       "dev": true
     },
     "typescript": {
-      "version": "3.2.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.2.2.tgz",
-      "integrity": "sha512-VCj5UiSyHBjwfYacmDuc/NOk4QQixbE+Wn7MFJuS0nRuPQbof132Pw4u53dm264O8LPc2MVsc7RJNml5szurkg==",
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.3.3.tgz",
+      "integrity": "sha512-Y21Xqe54TBVp+VDSNbuDYdGw0BpoR/Q6wo/+35M8PAU0vipahnyduJWirxxdxjsAkS7hue53x2zp8gz7F05u0A==",
       "dev": true
     },
     "uglify-js": {
@@ -9363,17 +9614,17 @@
       }
     },
     "webpack": {
-      "version": "4.28.2",
-      "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.28.2.tgz",
-      "integrity": "sha512-PK3uVg3/NuNVOjPfYleFI6JF7khO7c2kIlksH7mivQm+QDcwiqV1x6+q89dDeOioh5FNxJHr3LKbDu3oSAhl9g==",
+      "version": "4.29.3",
+      "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.29.3.tgz",
+      "integrity": "sha512-xPJvFeB+8tUflXFq+OgdpiSnsCD5EANyv56co5q8q8+YtEasn5Sj3kzY44mta+csCIEB0vneSxnuaHkOL2h94A==",
       "dev": true,
       "requires": {
         "@webassemblyjs/ast": "1.7.11",
         "@webassemblyjs/helper-module-context": "1.7.11",
         "@webassemblyjs/wasm-edit": "1.7.11",
         "@webassemblyjs/wasm-parser": "1.7.11",
-        "acorn": "^5.6.2",
-        "acorn-dynamic-import": "^3.0.0",
+        "acorn": "^6.0.5",
+        "acorn-dynamic-import": "^4.0.0",
         "ajv": "^6.1.0",
         "ajv-keywords": "^3.1.0",
         "chrome-trace-event": "^1.0.0",
@@ -9387,19 +9638,13 @@
         "mkdirp": "~0.5.0",
         "neo-async": "^2.5.0",
         "node-libs-browser": "^2.0.0",
-        "schema-utils": "^0.4.4",
+        "schema-utils": "^1.0.0",
         "tapable": "^1.1.0",
         "terser-webpack-plugin": "^1.1.0",
         "watchpack": "^1.5.0",
         "webpack-sources": "^1.3.0"
       },
       "dependencies": {
-        "acorn": {
-          "version": "5.7.3",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
-          "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
-          "dev": true
-        },
         "enhanced-resolve": {
           "version": "4.1.0",
           "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-4.1.0.tgz",
@@ -9421,16 +9666,6 @@
             "readable-stream": "^2.0.1"
           }
         },
-        "schema-utils": {
-          "version": "0.4.7",
-          "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-0.4.7.tgz",
-          "integrity": "sha512-v/iwU6wvwGK8HbU9yi3/nhGzP0yGSuhQMzL6ySiec1FSrZZDkhm4noOSWzrNFo/jEc+SJY6jRTwuwbSXJPDUnQ==",
-          "dev": true,
-          "requires": {
-            "ajv": "^6.1.0",
-            "ajv-keywords": "^3.1.0"
-          }
-        },
         "tapable": {
           "version": "1.1.1",
           "resolved": "https://registry.npmjs.org/tapable/-/tapable-1.1.1.tgz",
@@ -9440,21 +9675,22 @@
       }
     },
     "webpack-cli": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.1.2.tgz",
-      "integrity": "sha512-Cnqo7CeqeSvC6PTdts+dywNi5CRlIPbLx1AoUPK2T6vC1YAugMG3IOoO9DmEscd+Dghw7uRlnzV1KwOe5IrtgQ==",
+      "version": "3.2.3",
+      "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.2.3.tgz",
+      "integrity": "sha512-Ik3SjV6uJtWIAN5jp5ZuBMWEAaP5E4V78XJ2nI+paFPh8v4HPSwo/myN0r29Xc/6ZKnd2IdrAlpSgNOu2CDQ6Q==",
       "dev": true,
       "requires": {
         "chalk": "^2.4.1",
         "cross-spawn": "^6.0.5",
         "enhanced-resolve": "^4.1.0",
-        "global-modules-path": "^2.3.0",
+        "findup-sync": "^2.0.0",
+        "global-modules": "^1.0.0",
         "import-local": "^2.0.0",
         "interpret": "^1.1.0",
         "loader-utils": "^1.1.0",
         "supports-color": "^5.5.0",
         "v8-compile-cache": "^2.0.2",
-        "yargs": "^12.0.2"
+        "yargs": "^12.0.4"
       },
       "dependencies": {
         "cliui": {
@@ -9479,25 +9715,6 @@
             "tapable": "^1.0.0"
           }
         },
-        "find-up": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
-          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
-          "dev": true,
-          "requires": {
-            "locate-path": "^3.0.0"
-          }
-        },
-        "locate-path": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
-          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
-          "dev": true,
-          "requires": {
-            "p-locate": "^3.0.0",
-            "path-exists": "^3.0.0"
-          }
-        },
         "memory-fs": {
           "version": "0.4.1",
           "resolved": "https://registry.npmjs.org/memory-fs/-/memory-fs-0.4.1.tgz",
@@ -9508,30 +9725,6 @@
             "readable-stream": "^2.0.1"
           }
         },
-        "p-limit": {
-          "version": "2.1.0",
-          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.1.0.tgz",
-          "integrity": "sha512-NhURkNcrVB+8hNfLuysU8enY5xn2KXphsHBaC2YmRNTZRc7RWusw6apSpdEj3jo4CMb6W9nrF6tTnsJsJeyu6g==",
-          "dev": true,
-          "requires": {
-            "p-try": "^2.0.0"
-          }
-        },
-        "p-locate": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
-          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
-          "dev": true,
-          "requires": {
-            "p-limit": "^2.0.0"
-          }
-        },
-        "p-try": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.0.0.tgz",
-          "integrity": "sha512-hMp0onDKIajHfIkdRk3P4CdCmErkYAxxDtP3Wx/4nZ3aGlau2VKh3mZpcuFkH27WQkL/3WBCPOktzA9ZOAnMQQ==",
-          "dev": true
-        },
         "tapable": {
           "version": "1.1.1",
           "resolved": "https://registry.npmjs.org/tapable/-/tapable-1.1.1.tgz",
diff --git a/package.json b/package.json
index 0645117401..cf353a92c3 100644
--- a/package.json
+++ b/package.json
@@ -37,43 +37,43 @@
     "eventemitter3": "^3.1.0",
     "extend": "^3.0.2",
     "parchment": "2.0.0-dev.0",
-    "quill-delta": "4.1.0"
+    "quill-delta": "4.2.0"
   },
   "devDependencies": {
     "@babel/core": "^7.2.2",
-    "@babel/preset-env": "^7.2.0",
-    "babel-loader": "^8.0.4",
+    "@babel/preset-env": "^7.3.1",
+    "babel-loader": "^8.0.5",
     "babel-plugin-istanbul": "^5.1.0",
     "css-loader": "^2.1.0",
-    "eslint": "^5.10.0",
+    "eslint": "^5.13.0",
     "eslint-config-airbnb": "^17.1.0",
-    "eslint-config-prettier": "^3.3.0",
-    "eslint-import-resolver-webpack": "~0.10.1",
-    "eslint-plugin-import": "^2.14.0",
-    "eslint-plugin-jsx-a11y": "^6.1.2",
-    "eslint-plugin-prettier": "^3.0.0",
-    "eslint-plugin-react": "^7.11.1",
-    "highlight.js": "^9.13.1",
+    "eslint-config-prettier": "^4.0.0",
+    "eslint-import-resolver-webpack": "~0.11.0",
+    "eslint-plugin-import": "^2.16.0",
+    "eslint-plugin-jsx-a11y": "^6.2.1",
+    "eslint-plugin-prettier": "^3.0.1",
+    "eslint-plugin-react": "^7.12.4",
+    "highlight.js": "^9.14.2",
     "html-loader": "~0.5.5",
     "http-proxy": "^1.17.0",
     "jasmine": "^3.3.1",
     "jasmine-core": "^3.3.0",
-    "karma": "^3.1.4",
+    "karma": "^4.0.0",
     "karma-chrome-launcher": "^2.2.0",
     "karma-coverage": "^1.1.2",
     "karma-jasmine": "^2.0.1",
     "karma-sauce-launcher": "^2.0.2",
     "lodash": "^4.17.11",
     "mini-css-extract-plugin": "~0.5.0",
-    "prettier": "^1.15.3",
-    "puppeteer": "^1.11.0",
+    "prettier": "^1.16.4",
+    "puppeteer": "^1.12.2",
     "style-loader": "~0.23.1",
     "stylus": "~0.54.5",
     "stylus-loader": "^3.0.2",
-    "ts-loader": "^5.3.1",
-    "typescript": "^3.2.2",
-    "webpack": "^4.27.1",
-    "webpack-cli": "^3.1.2",
+    "ts-loader": "^5.3.3",
+    "typescript": "^3.3.3",
+    "webpack": "^4.29.3",
+    "webpack-cli": "^3.2.3",
     "webpack-dev-server": "^3.1.10"
   },
   "license": "BSD-3-Clause",
diff --git a/test/unit/modules/history.js b/test/unit/modules/history.js
index d4e3156762..a176f93234 100644
--- a/test/unit/modules/history.js
+++ b/test/unit/modules/history.js
@@ -214,5 +214,43 @@ describe('History', function() {
       this.quill.history.redo();
       expect(this.quill.getText()).toEqual('abcd\n');
     });
+
+    it('correctly transform against remote changes', function() {
+      this.quill.history.options.delay = 0;
+      this.quill.history.options.userOnly = true;
+      this.quill.setText('b\n');
+      this.quill.insertText(1, 'd', Quill.sources.USER);
+      this.quill.insertText(0, 'a', Quill.sources.USER);
+      this.quill.insertText(2, 'c', Quill.sources.API);
+      expect(this.quill.getText()).toEqual('abcd\n');
+      this.quill.history.undo();
+      expect(this.quill.getText()).toEqual('bcd\n');
+      this.quill.history.undo();
+      expect(this.quill.getText()).toEqual('bc\n');
+      this.quill.history.redo();
+      expect(this.quill.getText()).toEqual('bcd\n');
+      this.quill.history.redo();
+      expect(this.quill.getText()).toEqual('abcd\n');
+    });
+
+    it('correctly transform against remote changes breaking up an insert', function() {
+      this.quill.history.options.delay = 0;
+      this.quill.history.options.userOnly = true;
+      this.quill.setText('\n');
+      this.quill.insertText(0, 'ABC', Quill.sources.USER);
+      this.quill.insertText(3, '4', Quill.sources.API);
+      this.quill.insertText(2, '3', Quill.sources.API);
+      this.quill.insertText(1, '2', Quill.sources.API);
+      this.quill.insertText(0, '1', Quill.sources.API);
+      expect(this.quill.getText()).toEqual('1A2B3C4\n');
+      this.quill.history.undo();
+      expect(this.quill.getText()).toEqual('1234\n');
+      this.quill.history.redo();
+      expect(this.quill.getText()).toEqual('1A2B3C4\n');
+      this.quill.history.undo();
+      expect(this.quill.getText()).toEqual('1234\n');
+      this.quill.history.redo();
+      expect(this.quill.getText()).toEqual('1A2B3C4\n');
+    });
   });
 });