diff --git a/CHANGELOG.md b/CHANGELOG.md
index 187587b..9414d86 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+# [1.3.0](https://github.com/strangedev/css-in-js/compare/1.2.0...1.3.0) (2022-03-04)
+
+
+### Features
+
+* add duration ([#3](https://github.com/strangedev/css-in-js/issues/3)) ([3f6eeaf](https://github.com/strangedev/css-in-js/commit/3f6eeaf23e2dd44ac56ab8a5c6def7c04b8c53aa))
+
 # [1.2.0](https://github.com/strangedev/css-in-js/compare/1.1.0...1.2.0) (2022-03-02)
 
 
diff --git a/lib/index.ts b/lib/index.ts
index 1e810f7..0b20125 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -1,6 +1,7 @@
 import {
   CssBuilder
 } from './CssBuilder';
+import { Duration } from './quantities/Duration';
 import {
   Ch,
   ch,
@@ -51,6 +52,7 @@ export {
   ColorRgb,
   ColorRgba,
   CssBuilder,
+  Duration,
   Em,
   em,
   Ex,
diff --git a/package-lock.json b/package-lock.json
index ee58ffc..2f7e304 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@nhummel/css-in-js",
-  "version": "1.2.0",
+  "version": "1.3.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@nhummel/css-in-js",
-      "version": "1.2.0",
+      "version": "1.3.0",
       "license": "MIT",
       "dependencies": {
         "@types/color": "3.0.3",
diff --git a/package.json b/package.json
index 4a4ba67..5bfc765 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@nhummel/css-in-js",
-  "version": "1.2.0",
+  "version": "1.3.0",
   "description": "Helpers for generating CSS from JS.",
   "contributors": [
     {