diff --git a/CHANGELOG.md b/CHANGELOG.md
index 445f90c..0f71977 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [13.1.1](https://github.com/mljs/global-spectral-deconvolution/compare/v13.1.0...v13.1.1) (2025-11-19)
+
+
+### Bug Fixes
+
+* first derivative algorithm to detect peaks ([#135](https://github.com/mljs/global-spectral-deconvolution/issues/135)) ([05b0925](https://github.com/mljs/global-spectral-deconvolution/commit/05b092550330d8b152ae5e8294e64d5c5ac5bc13))
+
 ## [13.1.0](https://github.com/mljs/global-spectral-deconvolution/compare/v13.0.1...v13.1.0) (2025-09-22)
 
 
diff --git a/package.json b/package.json
index 42c2074..f653fcd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ml-gsd",
-  "version": "13.1.0",
+  "version": "13.1.1",
   "description": "Global Spectral Deconvolution",
   "type": "module",
   "exports": {