diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..b194ca1
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,25 @@
+# Changelog
+
+## 1.0.0-alpha (2023-03-30)
+
+
+### Features
+
+* Cast booleans ([a00c0b0](https://github.com/alecperkins/defaulted/commit/a00c0b0095706e4436e2122abd8e7774dd027737))
+* Cast numbers based on default types ([8791182](https://github.com/alecperkins/defaulted/commit/879118236740a708c4ae12f890939e9adb1c8499))
+* Include ENVIRONMENT ([a1c03ab](https://github.com/alecperkins/defaulted/commit/a1c03abc712912268b0558f118f0e509e311334c))
+* Make config readonly, prevent access of undefined keys ([d858850](https://github.com/alecperkins/defaulted/commit/d858850ea888f3c0b15b5a59d42ac4bbb4fdbc46))
+* Merge env with defaults, overrides ([fd2313f](https://github.com/alecperkins/defaulted/commit/fd2313fa4c6189b25812aa909142682bfaf4ac83))
+* Throw if override set to undefined is not found in the matching ENVIRONMENT ([da22d80](https://github.com/alecperkins/defaulted/commit/da22d807c5b194afd70ea9296e1c60e53782e52c))
+* Validate Boolean casting ([67e47c0](https://github.com/alecperkins/defaulted/commit/67e47c00d2163540c34998fceb16692cb697c33e))
+* Validate Number casting ([350483d](https://github.com/alecperkins/defaulted/commit/350483d531b114ed99fb162e563119058bca54d5))
+
+
+### Bug Fixes
+
+* Reliably throw on assignment ([824cc35](https://github.com/alecperkins/defaulted/commit/824cc351d3c92260aab275d34da208b713b04a59))
+
+
+### Miscellaneous Chores
+
+* release 1.0.0-alpha ([1f2be3a](https://github.com/alecperkins/defaulted/commit/1f2be3a8c8f01812658bcaac28817ada0f08cdd7))
diff --git a/package-lock.json b/package-lock.json
index 666a4b4..8dd0b74 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "defaulted",
-  "version": "0.0.0",
+  "version": "1.0.0-alpha",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "defaulted",
-      "version": "0.0.0",
+      "version": "1.0.0-alpha",
       "license": "MIT",
       "devDependencies": {
         "node-fetch": "^3.3.1",
diff --git a/package.json b/package.json
index 8e9dffe..7ad9103 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "defaulted",
-  "version": "0.0.0",
+  "version": "1.0.0-alpha",
   "description": "Build config from environment variables and sensible defaults, with typing and validation.",
   "author": "Alec Perkins <mail@alecperkins.me>",
   "license": "MIT",