diff --git a/CHANGELOG.md b/CHANGELOG.md
index 01ea109..cab49a6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,14 +9,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Breaking changes
 
-* The `--port-range` option was removed. Instead, `--port` can now be repeated and accepts dash-separated ranges. For example, the default is now equivalent to `--port 8080-8090 --port 0`.
-
-* This also corresponds to a breaking change to the `local_server` library interface
-
 ### New features
 
 ### Fixed bugs
 
+## [v0.4.0] - 2024-05-04
+
+### Breaking changes
+
+* The `--port-range` option was removed. Instead, `--port` can now be repeated and accepts dash-separated ranges. For example, the default is now equivalent to `--port 8080-8090 --port 0`.
+
+* This also corresponds to a breaking change to the `local_server` library interface
+
 ## [v0.3.0] - 2024-04-11
 
 Make `diffedit3` easier to install
diff --git a/Cargo.lock b/Cargo.lock
index a5dae6c..82c9a13 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -678,7 +678,7 @@ dependencies = [
 
 [[package]]
 name = "diffedit3"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "assert_matches",
  "clap",
@@ -702,7 +702,7 @@ dependencies = [
 
 [[package]]
 name = "diffedit3-gui"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "clap",
  "diffedit3",
diff --git a/Cargo.toml b/Cargo.toml
index 531d9d7..c9dcd37 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,7 +18,7 @@ include = ["/src", "/webapp/dist", "/*.md"]
 pkg-url = "{ repo }/releases/download/v{ version }/diffedit3-v{ version }-{ target }.{ archive-format }"
 
 [workspace.package]
-version = "0.3.0"  # Also update package.json and tauri.conf.json
+version = "0.4.0"  # Also update package.json and tauri.conf.json
 edition = "2021"
 license = "Apache-2.0"
 readme = "README.md"
diff --git a/backend-tauri/tauri.conf.json b/backend-tauri/tauri.conf.json
index 1b8c8af..8db7b80 100644
--- a/backend-tauri/tauri.conf.json
+++ b/backend-tauri/tauri.conf.json
@@ -8,7 +8,7 @@
   },
   "package": {
     "productName": "diffedit3-gui",
-    "version": "0.3.0"
+    "version": "0.4.0"
   },
   "tauri": {
     "allowlist": {
diff --git a/package-lock.json b/package-lock.json
index e35a97c..1927d75 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1888,7 +1888,7 @@
       "dev": true
     },
     "webapp": {
-      "version": "0.3.0",
+      "version": "0.4.0",
       "dependencies": {
         "@tauri-apps/api": "^1.5.3",
         "codemirror": "^5.65",
diff --git a/webapp/package.json b/webapp/package.json
index c96faf2..e305bc4 100644
--- a/webapp/package.json
+++ b/webapp/package.json
@@ -1,7 +1,7 @@
 {
   "name": "diffedit3-webapp",
   "private": true,
-  "version": "0.3.0",
+  "version": "0.4.0",
   "type": "module",
   "dependencies": {
     "@tauri-apps/api": "^1.5.3",