diff --git a/package.json b/package.json
index fb7df56..e1052af 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "karma-chrome-launcher": "^0.2.2",
     "karma-jasmine": "^0.3.1",
     "karma-notify-reporter": "^0.1.1",
-    "lodash": "^3.10.1",
+    "lodash": "^4.6.1",
     "node-bourbon": "^4.2.3",
     "snapsvg": "^0.4.0",
     "through": "^2.3.8",
diff --git a/src/js/parser/javascript/charset.js b/src/js/parser/javascript/charset.js
index a56e1b0..a021126 100644
--- a/src/js/parser/javascript/charset.js
+++ b/src/js/parser/javascript/charset.js
@@ -54,7 +54,7 @@ export default {
     // and text value of the part, so `[aa]` will have only one item, but
     // `[a\x61]` will contain two since the first matches "a" and the second
     // matches 0x61 (even though both are an "a").
-    this.elements = _.unique(this.properties.parts.elements, part => {
+    this.elements = _.uniqBy(this.properties.parts.elements, part => {
       return `${part.type}:${part.textValue}`;
     });
 
diff --git a/src/js/parser/javascript/root.js b/src/js/parser/javascript/root.js
index 87567d4..c50d720 100644
--- a/src/js/parser/javascript/root.js
+++ b/src/js/parser/javascript/root.js
@@ -47,7 +47,7 @@ export default {
 
   setup() {
     // Convert list of flags into text describing each flag.
-    this.flags = _(this.properties.flags.textValue).unique().sort().map(flag => {
+    this.flags = _(this.properties.flags.textValue).uniq().sort().map(flag => {
       return this.flagLabels[flag];
     }).value();