diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3955066b..236efbe0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -363,15 +363,21 @@ fixed some issues and configured files for publishing diff-ymd-package v2.0.2 on
 
 - updated details about parent developer QuranBookk.com
 
+### [v3.1.11]
+
+#### Fixed
+
+- updated details about parent developer QuranBookk.com
   
 ### [Next Release] - Collecting issues and new features for next release
 
 ### Important changes links:
 
-- [Unreleased](https://github.com/farhan7reza7/diff-ymd-package/compare/v3.1.10...HEAD)
-- [v3.1.10](https://github.com/farhan7reza7/diff-ymd-package/releases/tag/v3.1.10)
+- [Unreleased](https://github.com/farhan7reza7/diff-ymd-package/compare/v3.1.11...HEAD)
+- [v3.1.11](https://github.com/farhan7reza7/diff-ymd-package/releases/tag/v3.1.11)
 - [Next Release](https://github.com/farhan7reza7/diff-ymd-package/milestone/2)
 
 
 
 
+
diff --git a/README.md b/README.md
index 360fe938..2d5c3236 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,7 @@
 - 🕰️ **[Islamic Prayer Times](https://www.quranbookk.com/prayer-times)** – Updated Salah timings based on your current location
 - 🕰️ **[Worldwide Islamic Prayer Times](https://www.quranbookk.com/prayer-times/worldwide)** – Updated Salah timings for any country, state, or city of the world
 - 📿 **[Digital Tasbih Counter](https://www.quranbookk.com/digital-tasbih)** – Count your Dhikr anytime, anywhere  
+- 📅 **[Islamic Hijri Calendar](https://www.quranbookk.com/islamic-calendar)** – Get accurate Hijri calendar with sunset based location aware calculations
 - 🤖 **[Ask Islam AI](https://www.quranbookk.com/ask-islam-ai)** – AI-powered assistant for Islamic questions, Quran, and Hadiths
 - 🤖 **[Ask Quran AI](https://www.quranbookk.com/ask-quran-ai)** – AI-powered assistant for answering about Islamic history, Quran, and Hadiths
 - 🤖 **[Ask Hadith AI](https://www.quranbookk.com/ask-hadith-ai)** – AI-powered assistant for Hadiths
diff --git a/package.json b/package.json
index 928a0d34..967a460e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@farhan7reza7/diff-ymd-package",
-  "version": "3.1.10",
+  "version": "3.1.11",
   "description": "A javascript library for calculating the difference between two dates in formatted ways like (aY bM cD)(aYears bMonths cDays) or customized desired formats like aY-bM-cD or aYears-bMonths-cDays or kDays or mWeeks or nMonths etc.",
   "main": "lib/index.js",
   "scripts": {