diff --git a/package.json b/package.json
index 7ee495b..343cf3c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@tp/tp-popup",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "description": "",
   "main": "tp-popup.js",
   "scripts": {
diff --git a/tp-popup.js b/tp-popup.js
index 3ed55fa..9deffc5 100644
--- a/tp-popup.js
+++ b/tp-popup.js
@@ -117,6 +117,13 @@ class TpPopup extends EventHelpers(Position(DomQuery(LitElement))) {
     this.listen(this, 'click', '_onClick');
   }
 
+  updated(changes) {
+    // Fire event only if isOpen wasn't undefined before. Otherwise an event is fired at the first render.
+    if (changes.has('isOpen') && changes.get('isOpen') !== undefined) {
+      this.dispatchEvent(new CustomEvent('is-open-changed', { detail: this.isOpen, bubbles: true, composed: true }));
+    }
+  }
+
   disconnectedCallback() {
     super.disconnectedCallback();
     this._cleanupEvents();