diff --git a/lib/order/resolve-conflicts.js b/lib/order/resolve-conflicts.js
index 20556517..98ce1c12 100644
--- a/lib/order/resolve-conflicts.js
+++ b/lib/order/resolve-conflicts.js
@@ -1,6 +1,6 @@
 "use strict";
 
-var util = require("../util");
+let util = require("../util");
 
 module.exports = resolveConflicts;
 
@@ -30,9 +30,9 @@ module.exports = resolveConflicts;
  *    elements in `vs`.
  */
 function resolveConflicts(entries, cg) {
-  var mappedEntries = {};
+  let mappedEntries = {};
   entries.forEach((entry, i) => {
-    var tmp = mappedEntries[entry.v] = {
+    let tmp = mappedEntries[entry.v] = {
       indegree: 0,
       "in": [],
       out: [],
@@ -46,21 +46,21 @@ function resolveConflicts(entries, cg) {
   });
 
   cg.edges().forEach(e => {
-    var entryV = mappedEntries[e.v];
-    var entryW = mappedEntries[e.w];
+    let entryV = mappedEntries[e.v];
+    let entryW = mappedEntries[e.w];
     if (entryV !== undefined && entryW !== undefined) {
       entryW.indegree++;
       entryV.out.push(mappedEntries[e.w]);
     }
   });
 
-  var sourceSet = Object.values(mappedEntries).filter(entry => !entry.indegree);
+  let sourceSet = Object.values(mappedEntries).filter(entry => !entry.indegree);
 
   return doResolveConflicts(sourceSet);
 }
 
 function doResolveConflicts(sourceSet) {
-  var entries = [];
+  let entries = [];
 
   function handleIn(vEntry) {
     return uEntry => {
@@ -85,7 +85,7 @@ function doResolveConflicts(sourceSet) {
   }
 
   while (sourceSet.length) {
-    var entry = sourceSet.pop();
+    let entry = sourceSet.pop();
     entries.push(entry);
     entry["in"].reverse().forEach(handleIn(entry));
     entry.out.forEach(handleOut(entry));
@@ -97,8 +97,8 @@ function doResolveConflicts(sourceSet) {
 }
 
 function mergeEntries(target, source) {
-  var sum = 0;
-  var weight = 0;
+  let sum = 0;
+  let weight = 0;
 
   if (target.weight) {
     sum += target.barycenter * target.weight;