diff --git a/CHANGELOG.md b/CHANGELOG.md
index b5ab4fe..b923e03 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+### [2.1.5](https://www.github.com/mljs/regression-base/compare/v2.1.4...v2.1.5) (2021-11-16)
+
+
+### Bug Fixes
+
+* add type definitions to auxiliary functions ([#9](https://www.github.com/mljs/regression-base/issues/9)) ([c041fd9](https://www.github.com/mljs/regression-base/commit/c041fd9f7a6e6ad49477c2940a4344ba87d71a21))
+
 ### [2.1.4](https://www.github.com/mljs/regression-base/compare/v2.1.3...v2.1.4) (2021-10-12)
 
 
diff --git a/package.json b/package.json
index dcd5b94..c864415 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ml-regression-base",
-  "version": "2.1.4",
+  "version": "2.1.5",
   "description": "Base class for regression modules",
   "main": "lib/index.js",
   "module": "src/index.js",