diff --git a/CHANGELOG.md b/CHANGELOG.md
index f35aa82..e2f3144 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ For the changelog of the `percase-client` crate, please refer to its own [CHANGE
 
 ## Unreleased
 
+## v0.4.0 (2025-10-12)
+
 ### Breaking Changes
 
 * Standalone mode is removed. `server.mode` option is removed from the config file.
diff --git a/Cargo.lock b/Cargo.lock
index 84ffc7b..9fdc96e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -219,7 +219,7 @@ checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
 
 [[package]]
 name = "behavior-tests"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "insta",
  "mea",
@@ -2487,7 +2487,7 @@ checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"
 
 [[package]]
 name = "percas"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "anstyle",
  "clap",
@@ -2520,7 +2520,7 @@ dependencies = [
 
 [[package]]
 name = "percas-core"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "bytesize",
  "criterion",
@@ -2547,7 +2547,7 @@ dependencies = [
 
 [[package]]
 name = "percas-gossip"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "backon",
  "exn",
@@ -2569,14 +2569,14 @@ dependencies = [
 
 [[package]]
 name = "percas-metrics"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "opentelemetry",
 ]
 
 [[package]]
 name = "percas-server"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "arc-swap",
  "exn",
@@ -2608,7 +2608,7 @@ dependencies = [
 
 [[package]]
 name = "percas-version"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "build-data",
  "const_format",
@@ -4728,7 +4728,7 @@ checksum = "ea2f10b9bb0928dfb1b42b65e1f9e36f7f54dbdf08457afefb38afcdec4fa2bb"
 
 [[package]]
 name = "x"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "clap",
  "indent",
diff --git a/Cargo.toml b/Cargo.toml
index b5e0ca9..3d0e524 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,7 +31,7 @@ edition = "2024"
 license = "Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/scopedb/percas/"
-version = "0.3.0"
+version = "0.4.0"
 
 [workspace.dependencies]
 # Workspace published members