diff --git a/CHANGELOG.md b/CHANGELOG.md
index f83e3c2..19a7926 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 > **Note**: odd version numbers, for example, `0.13.0`, are not included in this changelog. They are used to test the new features and fixes before the final release.
 
+## [0.21.0] - Unreleased
+
+No changes yet.
+
 ## [0.20.0] - 2025-04-01
 
 ### Added:
diff --git a/package-lock.json b/package-lock.json
index 6091f96..64cd029 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "dev-proxy-toolkit",
-  "version": "0.20.0",
+  "version": "0.21.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "dev-proxy-toolkit",
-      "version": "0.20.0",
+      "version": "0.21.0",
       "dependencies": {
         "json-to-ast": "^2.1.0"
       },
diff --git a/package.json b/package.json
index f398f44..94bd8ef 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "dev-proxy-toolkit",
   "displayName": "Dev Proxy Toolkit",
   "description": "Makes it easy to create and update Dev Proxy configuration files.",
-  "version": "0.20.0",
+  "version": "0.21.0",
   "publisher": "garrytrinder",
   "engines": {
     "vscode": "^1.89.0"