diff --git a/.release-plan.json b/.release-plan.json
new file mode 100644
index 0000000000..fa12358e29
--- /dev/null
+++ b/.release-plan.json
@@ -0,0 +1,42 @@
+{
+  "solution": {
+    "limber-ui": {
+      "oldVersion": "1.0.0"
+    },
+    "ember-repl": {
+      "impact": "major",
+      "oldVersion": "3.0.0",
+      "newVersion": "4.0.0",
+      "constraints": [
+        {
+          "impact": "major",
+          "reason": "Appears in changelog section :boom: Breaking Change"
+        },
+        {
+          "impact": "minor",
+          "reason": "Appears in changelog section :rocket: Enhancement"
+        }
+      ],
+      "pkgJSONPath": "./packages/ember-repl/addon/package.json"
+    },
+    "codemirror-lang-glimdown": {
+      "oldVersion": "0.0.0"
+    },
+    "@glimdown/lezer": {
+      "oldVersion": "0.0.0"
+    },
+    "codemirror-lang-glimmer-js": {
+      "oldVersion": "0.0.0"
+    },
+    "@glimdown/lezer-glimmer-expression": {
+      "oldVersion": "0.0.0"
+    },
+    "codemirror-lang-glimmer": {
+      "oldVersion": "0.0.0"
+    },
+    "lezer-glimmer": {
+      "oldVersion": "0.0.0"
+    }
+  },
+  "description": "## Release (2024-02-20)\n\nember-repl 4.0.0 (major)\n\n#### :boom: Breaking Change\n* `ember-repl`, `ember-repl-test-app`\n  * [#1674](https://github.com/NullVoxPopuli/limber/pull/1674) Refactor the compilation library to prepare for broader usage ([@NullVoxPopuli](https://github.com/NullVoxPopuli))\n* `ember-repl`\n  * [#1672](https://github.com/NullVoxPopuli/limber/pull/1672) [ember-repl] remove broccoli plugin for generating a 'component map' ([@NullVoxPopuli](https://github.com/NullVoxPopuli))\n\n#### :rocket: Enhancement\n* `ember-repl`, `ember-repl-test-app`\n  * [#1674](https://github.com/NullVoxPopuli/limber/pull/1674) Refactor the compilation library to prepare for broader usage ([@NullVoxPopuli](https://github.com/NullVoxPopuli))\n\n#### :house: Internal\n* `ember-repl-test-app`\n  * [#1676](https://github.com/NullVoxPopuli/limber/pull/1676) Remove skipped tests that have been skipped for years ([@NullVoxPopuli](https://github.com/NullVoxPopuli))\n* Other\n  * [#1670](https://github.com/NullVoxPopuli/limber/pull/1670) Release plan ([@NullVoxPopuli](https://github.com/NullVoxPopuli))\n\n#### Committers: 1\n- [@NullVoxPopuli](https://github.com/NullVoxPopuli)\n"
+}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 825c32f0d0..244baf6626 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1 +1,24 @@
 # Changelog
+
+## Release (2024-02-20)
+
+ember-repl 4.0.0 (major)
+
+#### :boom: Breaking Change
+* `ember-repl`, `ember-repl-test-app`
+  * [#1674](https://github.com/NullVoxPopuli/limber/pull/1674) Refactor the compilation library to prepare for broader usage ([@NullVoxPopuli](https://github.com/NullVoxPopuli))
+* `ember-repl`
+  * [#1672](https://github.com/NullVoxPopuli/limber/pull/1672) [ember-repl] remove broccoli plugin for generating a 'component map' ([@NullVoxPopuli](https://github.com/NullVoxPopuli))
+
+#### :rocket: Enhancement
+* `ember-repl`, `ember-repl-test-app`
+  * [#1674](https://github.com/NullVoxPopuli/limber/pull/1674) Refactor the compilation library to prepare for broader usage ([@NullVoxPopuli](https://github.com/NullVoxPopuli))
+
+#### :house: Internal
+* `ember-repl-test-app`
+  * [#1676](https://github.com/NullVoxPopuli/limber/pull/1676) Remove skipped tests that have been skipped for years ([@NullVoxPopuli](https://github.com/NullVoxPopuli))
+* Other
+  * [#1670](https://github.com/NullVoxPopuli/limber/pull/1670) Release plan ([@NullVoxPopuli](https://github.com/NullVoxPopuli))
+
+#### Committers: 1
+- [@NullVoxPopuli](https://github.com/NullVoxPopuli)
diff --git a/packages/ember-repl/addon/package.json b/packages/ember-repl/addon/package.json
index eada9fbcca..6053f04de1 100644
--- a/packages/ember-repl/addon/package.json
+++ b/packages/ember-repl/addon/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ember-repl",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "description": "Addon for enabling REPL and Playground creation with Ember/Glimmer",
   "keywords": [
     "ember-addon"
@@ -168,9 +168,15 @@
     "@glimmer/syntax": ">= 0.86.0"
   },
   "peerDependenciesMeta": {
-    "@glint/template": { "optional": true },
-    "@glimmer/compiler": { "optional": true },
-    "@glimmer/syntax": { "optional": true }
+    "@glint/template": {
+      "optional": true
+    },
+    "@glimmer/compiler": {
+      "optional": true
+    },
+    "@glimmer/syntax": {
+      "optional": true
+    }
   },
   "engines": {
     "node": ">= v16",
diff --git a/stderr.log b/stderr.log
new file mode 100644
index 0000000000..f23d4337aa
--- /dev/null
+++ b/stderr.log
@@ -0,0 +1,3 @@
+Warning: unknown package "ember-repl-test-app"
+Warning: unknown package "ember-repl-test-app"
+Warning: unknown package "ember-repl-test-app"