diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0db5787..a4f1ad5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,17 @@
+# [1.4.0](https://github.com/Tada5hi/smob/compare/v1.3.0...v1.4.0) (2023-05-29)
+
+
+### Bug Fixes
+
+* better polyfill implementation for cloning arrays and objects ([fad6beb](https://github.com/Tada5hi/smob/commit/fad6bebd9d7dc016f5c8a153e1e8181f12704bfb))
+* create a new weak map for each source ([4ed64d2](https://github.com/Tada5hi/smob/commit/4ed64d26bc0d2acc7fe075ad45a3cccd3bd4aa19))
+* remove unused utility methods + applied linter ([76baf8e](https://github.com/Tada5hi/smob/commit/76baf8eee28359480878dce17d0dd31143c2610e))
+
+
+### Features
+
+* use weak-map instead of json-stringify for circular reference handling ([33b4ea4](https://github.com/Tada5hi/smob/commit/33b4ea4cef102dec3334f08c66f25fbb84bcafb4))
+
 # [1.3.0](https://github.com/Tada5hi/smob/compare/v1.2.0...v1.3.0) (2023-05-28)
 
 
diff --git a/package-lock.json b/package-lock.json
index 2a770bc..8315d8e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
     "name": "smob",
-    "version": "1.3.0",
+    "version": "1.4.0",
     "lockfileVersion": 3,
     "requires": true,
     "packages": {
         "": {
             "name": "smob",
-            "version": "1.3.0",
+            "version": "1.4.0",
             "license": "MIT",
             "devDependencies": {
                 "@rollup/plugin-node-resolve": "^15.0.2",
diff --git a/package.json b/package.json
index b2a1775..3531055 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "smob",
-    "version": "1.3.0",
+    "version": "1.4.0",
     "description": "Zero dependency library to safe merge objects.",
     "main": "dist/index.cjs",
     "module": "dist/index.mjs",