diff --git a/handlers/api-get/milestoneICS.js b/handlers/api-get/milestoneICS.js
index c5f40cd8..8d5459ea 100644
--- a/handlers/api-get/milestoneICS.js
+++ b/handlers/api-get/milestoneICS.js
@@ -116,20 +116,16 @@ function buildEventDescriptionHTML_lots(request, milestone) {
                 '</tr></thead>' +
                 '<tbody>';
         for (const lot of milestone.workOrderLots) {
-            descriptionHTML +=
-                '<tr>' +
-                    ('<td>' +
-                        '<a href="' +
-                        urlRoot +
-                        '/lots/' +
-                        lot.lotId +
-                        '">' +
-                        escapeHTML(lot.lotName ?? '') +
-                        '</a></td>') +
-                    `<td>${escapeHTML(lot.mapName ?? '')}</td>` +
-                    `<td>${escapeHTML(lot.lotType ?? '')}</td>` +
-                    `<td>${escapeHTML(lot.lotStatus ?? '')}</td>` +
-                    '</tr>';
+            descriptionHTML += `<tr>
+          <td>
+            <a href="${urlRoot}/lots/${lot.lotId.toString()}">
+              ${escapeHTML(lot.lotName ?? '')}
+            </a>
+          </td>
+          <td>${escapeHTML(lot.mapName ?? '')}</td>
+          <td>${escapeHTML(lot.lotType ?? '')}</td>
+          <td>${escapeHTML(lot.lotStatus ?? '')}</td>
+        </tr>`;
         }
         descriptionHTML += '</tbody></table>';
     }
@@ -152,7 +148,7 @@ function buildEventDescriptionHTML_prints(request, milestone) {
                             '/print/' +
                             printName +
                             '/?workOrderId=' +
-                            milestone.workOrderId) +
+                            milestone.workOrderId.toString()) +
                         '</p>';
             }
         }
@@ -213,7 +209,7 @@ export async function handler(request, response) {
     });
     if (request.query.workOrderId && workOrderMilestones.length > 0) {
         calendar.name(`Work Order #${workOrderMilestones[0].workOrderNumber}`);
-        calendar.url(urlRoot + '/workOrders/' + workOrderMilestones[0].workOrderId);
+        calendar.url(urlRoot + '/workOrders/' + workOrderMilestones[0].workOrderId.toString());
     }
     calendar.prodId({
         company: calendarCompany,
diff --git a/handlers/api-get/milestoneICS.ts b/handlers/api-get/milestoneICS.ts
index cd2934dd..82fd1ffb 100644
--- a/handlers/api-get/milestoneICS.ts
+++ b/handlers/api-get/milestoneICS.ts
@@ -175,20 +175,16 @@ function buildEventDescriptionHTML_lots(
       '<tbody>'
 
     for (const lot of milestone.workOrderLots!) {
-      descriptionHTML +=
-        '<tr>' +
-        ('<td>' +
-          '<a href="' +
-          urlRoot +
-          '/lots/' +
-          lot.lotId +
-          '">' +
-          escapeHTML(lot.lotName ?? '') +
-          '</a></td>') +
-        `<td>${escapeHTML(lot.mapName ?? '')}</td>` +
-        `<td>${escapeHTML(lot.lotType ?? '')}</td>` +
-        `<td>${escapeHTML(lot.lotStatus ?? '')}</td>` +
-        '</tr>'
+      descriptionHTML += `<tr>
+          <td>
+            <a href="${urlRoot}/lots/${lot.lotId.toString()}">
+              ${escapeHTML(lot.lotName ?? '')}
+            </a>
+          </td>
+          <td>${escapeHTML(lot.mapName ?? '')}</td>
+          <td>${escapeHTML(lot.lotType ?? '')}</td>
+          <td>${escapeHTML(lot.lotStatus ?? '')}</td>
+        </tr>`
     }
 
     descriptionHTML += '</tbody></table>'
@@ -223,7 +219,7 @@ function buildEventDescriptionHTML_prints(
             '/print/' +
             printName +
             '/?workOrderId=' +
-            milestone.workOrderId) +
+            milestone.workOrderId!.toString()) +
           '</p>'
       }
     }
@@ -320,7 +316,7 @@ export async function handler(
 
   if (request.query.workOrderId && workOrderMilestones.length > 0) {
     calendar.name(`Work Order #${workOrderMilestones[0].workOrderNumber!}`)
-    calendar.url(urlRoot + '/workOrders/' + workOrderMilestones[0].workOrderId)
+    calendar.url(urlRoot + '/workOrders/' + workOrderMilestones[0].workOrderId!.toString())
   }
 
   calendar.prodId({
diff --git a/package-lock.json b/package-lock.json
index 503caf8e..454e024b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -35,7 +35,7 @@
         "express-session": "^1.17.3",
         "font-awesome-v5-icons": "^1.3.0",
         "http-errors": "^2.0.0",
-        "ical-generator": "^3.6.1",
+        "ical-generator": "^4.0.0",
         "leaflet": "^1.9.3",
         "node-cache": "^5.1.2",
         "object.hasown": "^1.1.2",
@@ -6771,14 +6771,14 @@
       }
     },
     "node_modules/ical-generator": {
-      "version": "3.6.1",
-      "resolved": "https://registry.npmjs.org/ical-generator/-/ical-generator-3.6.1.tgz",
-      "integrity": "sha512-tEH0OTNn00Mp61DcTxIFR+5fhsAivKk1LWAJUAbkMCI+M4yu+cZzT5X8rZf3b5PzFkMogh0zj3PsFh9bHvGGIQ==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/ical-generator/-/ical-generator-4.0.0.tgz",
+      "integrity": "sha512-zDjku0O3z/nj/XwgWvhj8vcGwZj/09097VelHLIpUJzjfPdUBNnYkYjSsjrHiwc0HodpSA0U4hiJgz8XerHGXw==",
       "dependencies": {
         "uuid-random": "^1.3.2"
       },
       "engines": {
-        "node": ">=12.0.0"
+        "node": "^14.8.0 || >=16.0.0"
       },
       "peerDependencies": {
         "@touch4it/ical-timezones": ">=1.6.0",
@@ -17773,9 +17773,9 @@
       "dev": true
     },
     "ical-generator": {
-      "version": "3.6.1",
-      "resolved": "https://registry.npmjs.org/ical-generator/-/ical-generator-3.6.1.tgz",
-      "integrity": "sha512-tEH0OTNn00Mp61DcTxIFR+5fhsAivKk1LWAJUAbkMCI+M4yu+cZzT5X8rZf3b5PzFkMogh0zj3PsFh9bHvGGIQ==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/ical-generator/-/ical-generator-4.0.0.tgz",
+      "integrity": "sha512-zDjku0O3z/nj/XwgWvhj8vcGwZj/09097VelHLIpUJzjfPdUBNnYkYjSsjrHiwc0HodpSA0U4hiJgz8XerHGXw==",
       "requires": {
         "uuid-random": "^1.3.2"
       }
diff --git a/package.json b/package.json
index caeb286f..40744ad0 100644
--- a/package.json
+++ b/package.json
@@ -59,7 +59,7 @@
     "express-session": "^1.17.3",
     "font-awesome-v5-icons": "^1.3.0",
     "http-errors": "^2.0.0",
-    "ical-generator": "^3.6.1",
+    "ical-generator": "^4.0.0",
     "leaflet": "^1.9.3",
     "node-cache": "^5.1.2",
     "object.hasown": "^1.1.2",