diff --git a/strange_eons_to_arkhamdb.js b/strange_eons_to_arkhamdb.js
index 69d6600..cbffe38 100644
--- a/strange_eons_to_arkhamdb.js
+++ b/strange_eons_to_arkhamdb.js
@@ -90,15 +90,15 @@ function build_card(component) {
     str = str.trim();
     str = replaceAll(str, "<fullname>", String(component.getName()));
 
-    for (var tag in tag_replacements) {
+    for (let tag in tag_replacements) {
       str = replaceAll(str, tag, tag_replacements[tag]);
     }
     return str;
   }
 
-  var code = cycle_prefix + leftPad(String(component.settings.get('CollectionNumber')), 3, '0');
+  const code = cycle_prefix + leftPad(String(component.settings.get('CollectionNumber')), 3, '0');
 
-  var card_data = {
+  const card_data = {
     code: String(code),
     deck_limit: 2, // TODO: could be derived?
     flavor: substitute_tags(String(component.settings.get('Flavor'))),
@@ -117,54 +117,54 @@ function build_card(component) {
     xp: int_or_null(component.settings.get('Level')),
   };
 
-  var raw_health = component.settings.get('Stamina');
+  const raw_health = component.settings.get('Stamina');
   if (raw_health && raw_health != 'None' && raw_health != '-') {
     card_data.health = int_or_null(raw_health);
   }
-  var raw_sanity = component.settings.get('Sanity');
+  const raw_sanity = component.settings.get('Sanity');
   if (raw_sanity && raw_sanity != 'None' && raw_sanity != '-') {
     card_data.sanity = int_or_null(raw_sanity);
   }
 
-   var skills = {
+   const skills = {
     Agility: 0,
     Intellect: 0,
     Combat: 0,
     Willpower: 0,
     Wild: 0,
   };
-  for (var i = 1; i<=6; i++) {
-    var skill_icon = component.settings.get('Skill' + i);
+  for (let i = 1; i<=6; i++) {
+    const skill_icon = component.settings.get('Skill' + i);
     if (skill_icon in skills) {
       skills[skill_icon] += 1;
     }
   }
-  for (var skill in skills) {
+  for (let skill in skills) {
     if (skills[skill] > 0) {
       card_data["skill_" + skill.toLowerCase()] = skills[skill];
     }
   }
 
-  var raw_cost = component.settings.get('ResourceCost');
+  const raw_cost = component.settings.get('ResourceCost');
   if (raw_cost) {
     card_data.cost = int_or_null(raw_cost);
   }
 
-  var raw_slot = component.settings.get('Slot');
+  const raw_slot = component.settings.get('Slot');
   if (raw_slot && raw_slot != 'None') {
     card_data.slot = renameSlot(String(raw_slot));
-    var raw_slot2 = component.settings.get('Slot2');
+    const raw_slot2 = component.settings.get('Slot2');
     if (raw_slot2 && raw_slot2 != 'None') {
       card_data.slot += '. ' + renameSlot(String(raw_slot2));
     }
   }
 
-  var subtitle = component.settings.get('Subtitle');
+  const subtitle = component.settings.get('Subtitle');
   if (subtitle && subtitle != '') {
     card_data.subname = String(subtitle);
   }
 
-  var faction = component.settings.get('CardClass');
+  const faction = component.settings.get('CardClass');
   if (faction) {
     if (faction == 'Weakness') {
       card_data.subtype_code = "weakness";
@@ -174,7 +174,7 @@ function build_card(component) {
     }
     else {
       card_data.faction_code = String(faction).toLowerCase();
-      var faction2 = component.settings.get('CardClass2');
+      const faction2 = component.settings.get('CardClass2');
       if (faction2 && faction2 != 'None') {
         card_data.faction2_code = String(faction2).toLowerCase();
       }
@@ -200,13 +200,13 @@ function build_card(component) {
   return ordered_card_data;
 }
 
-var cards = [];
-var member_iter = Eons.getOpenProject().iterator();
+const cards = [];
+const member_iter = Eons.getOpenProject().iterator();
 while (member_iter.hasNext()) {
-  var member = member_iter.next();
+  const member = member_iter.next();
   printf("Generating JSON for '%s'...\n", member);
-  var component = ResourceKit.getGameComponentFromFile(member.getFile());
-  var card_data = build_card(component);
+  const component = ResourceKit.getGameComponentFromFile(member.getFile());
+  const card_data = build_card(component);
   cards.push(card_data);
 }