diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1b6a1d6c..60c53145 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,33 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.4.0] - 2023-08-31
+
+### Bug Fixes
+
+- Improve code generation using cleaner URL usage
+- Do not override headers with default headers
+- Adjust wrong LinkRelationTypes definitions
+- Implement Copy for ResourceType
+- Implement Display for ResourceType
+
+### Documentation
+
+- Improve generated doc comments
+
+### Features
+
+- Implement basic REST client
+- Implement paging
+- Implement search with typed helpers
+
+### Miscellaneous Tasks
+
+- Fix new clippy lints
+- Add expansions for R4B and remove unneeded definitions
+- Update typed-builder and fhir-sdk dependencies
+- Update README
+
 ## [0.3.0] - 2023-04-01
 
 ### Bug Fixes
diff --git a/Cargo.lock b/Cargo.lock
index a2168d8e..6c2a6e14 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -200,31 +200,31 @@ checksum = "6999dc1837253364c2ebb0704ba97994bd874e8f195d665c50b7548f6ea92764"
 [[package]]
 name = "fhir-model"
 version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33964d0de38324d137cc3a250b8ffd5508ae37e66741dbc939b10726710564b5"
 dependencies = [
- "assert-json-diff",
  "serde",
- "serde_json",
- "typed-builder 0.15.2",
+ "typed-builder 0.14.0",
 ]
 
 [[package]]
 name = "fhir-model"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "33964d0de38324d137cc3a250b8ffd5508ae37e66741dbc939b10726710564b5"
+version = "0.4.0"
 dependencies = [
+ "assert-json-diff",
  "serde",
- "typed-builder 0.14.0",
+ "serde_json",
+ "typed-builder 0.16.0",
 ]
 
 [[package]]
 name = "fhir-sdk"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "async-trait",
  "dotenvy",
  "eyre",
- "fhir-model 0.3.0",
+ "fhir-model 0.4.0",
  "futures",
  "reqwest",
  "serde",
@@ -359,7 +359,7 @@ version = "0.1.0"
 dependencies = [
  "Inflector",
  "anyhow",
- "fhir-model 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fhir-model 0.3.0",
  "once_cell",
  "prettyplease",
  "proc-macro2",
@@ -1224,18 +1224,18 @@ dependencies = [
 
 [[package]]
 name = "typed-builder"
-version = "0.15.2"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fe83c85a85875e8c4cb9ce4a890f05b23d38cd0d47647db7895d3d2a79566d2"
+checksum = "6605aaa56cce0947127ffa0675a8a1b181f87773364390174de60a86ab9085f1"
 dependencies = [
  "typed-builder-macro",
 ]
 
 [[package]]
 name = "typed-builder-macro"
-version = "0.15.2"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "29a3151c41d0b13e3d011f98adc24434560ef06673a155a6c7f66b9879eecce2"
+checksum = "2a6a6884f6a890a012adcc20ce498f30ebdc70fb1ea242c333cc5f435b0b3871"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/crates/fhir-model/Cargo.toml b/crates/fhir-model/Cargo.toml
index 2f33e52e..db9c4334 100644
--- a/crates/fhir-model/Cargo.toml
+++ b/crates/fhir-model/Cargo.toml
@@ -11,7 +11,7 @@ license = "MIT"
 name = "fhir-model"
 readme = "README.md"
 repository = "https://github.com/FlixCoder/fhir-sdk"
-version = "0.3.0"
+version = "0.4.0"
 
 [features]
 default = ["r5"]
@@ -20,7 +20,7 @@ r5 = []
 
 [dependencies]
 serde = {version = "1.0.158", features = ["derive"]}
-typed-builder = "0.15.2"
+typed-builder = "0.16.0"
 
 [dev-dependencies]
 assert-json-diff = "2.0.2"
diff --git a/crates/fhir-sdk/Cargo.toml b/crates/fhir-sdk/Cargo.toml
index b29d0e25..f9ba8130 100644
--- a/crates/fhir-sdk/Cargo.toml
+++ b/crates/fhir-sdk/Cargo.toml
@@ -10,7 +10,7 @@ license = "MIT"
 name = "fhir-sdk"
 readme = "README.md"
 repository = "https://github.com/FlixCoder/fhir-sdk"
-version = "0.3.0"
+version = "0.4.0"
 
 [features]
 client = ["dep:async-trait", "dep:futures", "dep:reqwest", "dep:serde", "dep:serde_json", "dep:thiserror", "dep:tokio-retry"]
@@ -20,7 +20,7 @@ r5 = ["fhir-model/r5"]
 
 [dependencies]
 async-trait = {version = "0.1.68", optional = true}
-fhir-model = {path = "../fhir-model", version = "0.3.0"}
+fhir-model = {path = "../fhir-model", version = "0.4.0"}
 futures = {version = "0.3.28", optional = true}
 reqwest = {version = "0.11.16", features = ["json"], optional = true}
 serde = {version = "1.0.159", optional = true}