diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3eb5554..4425b92 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## Unreleased
+## 0.4.0 (2026-08-18)
 
 The CLI and MCP server now share one set of operation declarations (`src/ops/`),
 so the two surfaces expose identical operations with identical parameters.
diff --git a/Cargo.lock b/Cargo.lock
index 6be24c2..fbffb9e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -501,7 +501,7 @@ dependencies = [
 
 [[package]]
 name = "fossapi"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "async-trait",
  "axum",
diff --git a/Cargo.toml b/Cargo.toml
index eb71b82..3c8ab27 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "fossapi"
-version = "0.3.0"
+version = "0.4.0"
 edition = "2021"
 description = "Rust client library for the FOSSA REST API"
 license = "MIT"