diff --git a/CHANGELOG.md b/CHANGELOG.md
index 485415e..2fca4ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+## [1.2.0](https://github.com/adamhamlin/deep-equality-data-structures/compare/v1.1.0...v1.2.0) (2023-01-31)
+
+
+### Features
+
+* Add `union`, `intersection`, and `difference` methods ([#12](https://github.com/adamhamlin/deep-equality-data-structures/issues/12)) ([31f61c0](https://github.com/adamhamlin/deep-equality-data-structures/commit/31f61c0cb49f106c2c7f24ac463a0b96905ba602))
+
 ## [1.1.0](https://github.com/adamhamlin/deep-equality-data-structures/compare/v1.0.3...v1.1.0) (2023-01-05)
 
 
diff --git a/package-lock.json b/package-lock.json
index fc21604..0811fac 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
     "name": "deep-equality-data-structures",
-    "version": "1.1.0",
+    "version": "1.2.0",
     "lockfileVersion": 2,
     "requires": true,
     "packages": {
         "": {
             "name": "deep-equality-data-structures",
-            "version": "1.1.0",
+            "version": "1.2.0",
             "license": "MIT",
             "dependencies": {
                 "object-hash": "^3.0.0"
diff --git a/package.json b/package.json
index 16c7110..99d0711 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "deep-equality-data-structures",
-    "version": "1.1.0",
+    "version": "1.2.0",
     "description": "Javascript data structures (e.g., Map, Set) that support deep object equality",
     "main": "dist/index.js",
     "types": "dist/index.d.ts",