diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 0ee8c01..2537c1f 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.3.0"
+  ".": "0.4.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b17e77..32bcb09 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.4.0](https://github.com/coko7/watari/compare/watari-v0.3.0...watari-v0.4.0) (2026-07-06)
+
+
+### Features
+
+* **upload:** add drag-and-drop file upload with size display ([7449a43](https://github.com/coko7/watari/commit/7449a43b9d5cd89622c40425bc400add3f364ce2))
+
 ## [0.3.0](https://github.com/coko7/watari/compare/watari-v0.2.0...watari-v0.3.0) (2026-07-06)
 
 
diff --git a/Cargo.lock b/Cargo.lock
index 0c75acd..55d46c0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3711,7 +3711,7 @@ dependencies = [
 
 [[package]]
 name = "watari"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "anyhow",
  "askama",
diff --git a/Cargo.toml b/Cargo.toml
index 8845dd9..cb4cf03 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "watari"
-version = "0.3.0"
+version = "0.4.0"
 edition = "2024"
 
 [dependencies]