diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2b77b37..53978d2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [3.1.1](https://github.com/mljs/sparse-matrix/compare/v3.1.0...v3.1.1) (2025-07-08)
+
+
+### Performance Improvements
+
+* optimize to2DArray method by only getting non-zeros ([#19](https://github.com/mljs/sparse-matrix/issues/19)) ([e80f453](https://github.com/mljs/sparse-matrix/commit/e80f4536e30428c8b4d187a4fc3af9c7f7fe825a))
+
 ## [3.1.0](https://github.com/mljs/sparse-matrix/compare/v3.0.1...v3.1.0) (2025-07-07)
 
 
diff --git a/package.json b/package.json
index f4483dd..9297ec5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ml-sparse-matrix",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "Sparse matrix library",
   "type": "module",
   "exports": "./lib/index.js",