diff --git a/Cargo.lock b/Cargo.lock
index d3d8895..7f53042 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1820,7 +1820,7 @@ checksum = "ebc1c04c71510c7f702b52b7c350734c9ff1295c464a03335b00bb84fc54f853"
 
 [[package]]
 name = "usagedb"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "anyhow",
  "arrow",
diff --git a/Cargo.toml b/Cargo.toml
index a3407d2..8609cc6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "usagedb"
-version = "0.3.0"
+version = "0.4.0"
 edition = "2024"
 license = "Apache-2.0"
 description = "Embedded append-only usage database for AI billing workloads"