diff --git a/src/models/claim.js b/src/models/claim.js
deleted file mode 100644
index baa4b5dd2..000000000
--- a/src/models/claim.js
+++ /dev/null
@@ -1,30 +0,0 @@
-import EasyPostObject from './easypost_object';
-
-/**
- * An {@link https://docs.easypost.com/docs/insurance/claims Claim} object represents claim for a {@link Shipment shipment}.
- * @public
- * @extends EasyPostObject
- */
-export default class Claim extends EasyPostObject {
-  static id;
-  static object;
-  static mode;
-  static attachments;
-  static contact_email;
-  static created_at;
-  static description;
-  static history;
-  static insurance_amount;
-  static insurance_id;
-  static payment_method;
-  static recipient_name;
-  static reference;
-  static requested_amount;
-  static shipment_id;
-  static status_detail;
-  static status_timestamp;
-  static status;
-  static tracking_code;
-  static type;
-  static updated_at;
-}
diff --git a/src/models/claim.ts b/src/models/claim.ts
new file mode 100644
index 000000000..5cb378f8f
--- /dev/null
+++ b/src/models/claim.ts
@@ -0,0 +1,28 @@
+import EasyPostObject from './easypost_object';
+
+/**
+ * An {@link https://docs.easypost.com/docs/insurance/claims Claim} object represents claim for a {@link Shipment shipment}.
+ * @public
+ * @extends EasyPostObject
+ */
+export default class Claim extends EasyPostObject {
+  declare approved_amount?: string | null;
+  declare attachments?: string[] | null;
+  declare check_delivery_address?: string | null;
+  declare contact_email?: string | null;
+  declare description?: string | null;
+  declare history?: Record<string, unknown>[] | null;
+  declare insurance_amount?: string | null;
+  declare insurance_id?: string | null;
+  declare payment_method?: string | null;
+  declare recipient_name?: unknown | null;
+  declare reference?: string | null;
+  declare requested_amount?: string | null;
+  declare salvage_value?: unknown | null;
+  declare shipment_id?: string | null;
+  declare status_detail?: string | null;
+  declare status_timestamp?: string | null;
+  declare status?: string | null;
+  declare tracking_code?: string | null;
+  declare type?: string | null;
+}
diff --git a/src/models/event.js b/src/models/event.ts
similarity index 51%
rename from src/models/event.js
rename to src/models/event.ts
index f63cd7edd..6bf8f8729 100644
--- a/src/models/event.js
+++ b/src/models/event.ts
@@ -6,10 +6,10 @@ import EasyPostObject from './easypost_object';
  * @extends EasyPostObject
  */
 export default class Event extends EasyPostObject {
-  static completed_urls;
-  static description;
-  static pending_urls;
-  static previous_attributes;
-  static result;
-  static status;
+  declare completed_urls?: string[] | null;
+  declare description?: string | null;
+  declare pending_urls?: string[] | null;
+  declare previous_attributes?: Record<string, unknown> | null;
+  declare result?: Record<string, unknown> | null;
+  declare status?: 'completed' | 'failed' | 'in_queue' | 'retrying' | 'pending' | null;
 }
diff --git a/src/models/insurance.js b/src/models/insurance.js
deleted file mode 100644
index ea020b634..000000000
--- a/src/models/insurance.js
+++ /dev/null
@@ -1,21 +0,0 @@
-import EasyPostObject from './easypost_object';
-
-/**
- * An {@link https://docs.easypost.com/docs/api-keys Insurance} object represents insurance for a {@link Shipment shipment}.
- * @public
- * @extends EasyPostObject
- */
-export default class Insurance extends EasyPostObject {
-  static amount;
-  static fee;
-  static from_address;
-  static messages;
-  static provider_id;
-  static provider;
-  static reference;
-  static shipment_id;
-  static status;
-  static to_address;
-  static tracking_code;
-  static tracker;
-}
diff --git a/src/models/insurance.ts b/src/models/insurance.ts
new file mode 100644
index 000000000..337e1bd82
--- /dev/null
+++ b/src/models/insurance.ts
@@ -0,0 +1,21 @@
+import EasyPostObject from './easypost_object';
+
+/**
+ * An {@link https://docs.easypost.com/docs/api-keys Insurance} object represents insurance for a {@link Shipment shipment}.
+ * @public
+ * @extends EasyPostObject
+ */
+export default class Insurance extends EasyPostObject {
+  declare amount?: string | null;
+  declare fee?: Record<string, unknown> | null;
+  declare from_address?: Record<string, unknown> | null;
+  declare messages?: string[] | null;
+  declare provider_id?: string | null;
+  declare provider?: string | null;
+  declare reference?: string | null;
+  declare shipment_id?: string | null;
+  declare status?: 'new' | 'pending' | 'purchased' | 'failed' | 'cancelled' | null;
+  declare to_address?: Record<string, unknown> | null;
+  declare tracking_code?: string | null;
+  declare tracker?: Record<string, unknown> | null;
+}
diff --git a/src/models/payload.js b/src/models/payload.ts
similarity index 88%
rename from src/models/payload.js
rename to src/models/payload.ts
index 7fb47ac8d..68f557b66 100644
--- a/src/models/payload.js
+++ b/src/models/payload.ts
@@ -6,5 +6,5 @@ import EasyPostObject from './easypost_object';
  * @extends EasyPostObject
  */
 export default class Payload extends EasyPostObject {
-  static response_body;
+  declare response_body?: string | null;
 }
diff --git a/src/models/tracker.js b/src/models/tracker.js
deleted file mode 100644
index 88a2d15f6..000000000
--- a/src/models/tracker.js
+++ /dev/null
@@ -1,23 +0,0 @@
-import EasyPostObject from './easypost_object';
-
-/**
- * A {@link https://docs.easypost.com/docs/trackers Tracker} represents the available tracking information for a package.
- * @public
- * @extends EasyPostObject
- */
-export default class Tracker extends EasyPostObject {
-  static carrier_detail;
-  static carrier;
-  static est_delivery_date;
-  static fees;
-  static finalized;
-  static is_return;
-  static public_url;
-  static shipment_id;
-  static signed_by;
-  static status_detail;
-  static status;
-  static tracking_code;
-  static tracking_details;
-  static weight;
-}
diff --git a/src/models/tracker.ts b/src/models/tracker.ts
new file mode 100644
index 000000000..1e1ff45dc
--- /dev/null
+++ b/src/models/tracker.ts
@@ -0,0 +1,23 @@
+import EasyPostObject from './easypost_object';
+
+/**
+ * A {@link https://docs.easypost.com/docs/trackers Tracker} represents the available tracking information for a package.
+ * @public
+ * @extends EasyPostObject
+ */
+export default class Tracker extends EasyPostObject {
+  declare carrier_detail?: Record<string, unknown> | null;
+  declare carrier?: string | null;
+  declare est_delivery_date?: string | null;
+  declare fees?: Record<string, unknown>[] | null;
+  declare finalized?: boolean | null;
+  declare is_return?: boolean | null;
+  declare public_url?: string | null;
+  declare shipment_id?: string | null;
+  declare signed_by?: string | null;
+  declare status_detail?: string | null;
+  declare status?: string | null;
+  declare tracking_code?: string | null;
+  declare tracking_details?: Record<string, unknown>[] | null;
+  declare weight?: number | null;
+}
diff --git a/src/models/webhook.js b/src/models/webhook.ts
similarity index 68%
rename from src/models/webhook.js
rename to src/models/webhook.ts
index 6417304a6..5fb546d26 100644
--- a/src/models/webhook.js
+++ b/src/models/webhook.ts
@@ -6,6 +6,7 @@ import EasyPostObject from './easypost_object';
  * @extends EasyPostObject
  */
 export default class Webhook extends EasyPostObject {
-  static disabled_at;
-  static url;
+  declare custom_headers?: { key: string; value: string }[] | null;
+  declare disabled_at?: string | null;
+  declare url?: string | null;
 }