diff --git a/lib/index.js b/lib/index.js
index 80a1c4d..acb1be8 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -7,7 +7,7 @@ class Unvault extends Map {
    * @param {object} options
    */
   async insert(key, interval, update, options) {
-    this.set(key, { interval, update, ...options });
+    this.set(key, Object.assign({ interval, update }, options));
     return this.trigger(key, interval !== 0);
   }
 
@@ -31,7 +31,7 @@ class Unvault extends Map {
     const value = await tracker.update(key);
     if (this.has(key) === false) return null;
 
-    this.set(key, { ...tracker, value });
+    this.set(key, Object.assign(tracker, { value }));
     if (automated) {
       setTimeout(() => {
         this.trigger(key, automated);
diff --git a/package.json b/package.json
index ca59e27..091586d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "unvault",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "description": "A minimal layer for node that allows results of time-consuming tasks to be stored.",
   "repository": "vaneenige/unvault",
   "main": "lib/index.js",