diff --git a/.github/workflows/format-code.yml b/.github/workflows/format-code.yml
index 03e6d1a..844afa7 100644
--- a/.github/workflows/format-code.yml
+++ b/.github/workflows/format-code.yml
@@ -8,7 +8,7 @@ on:
 jobs:
   format-code:
     runs-on: "ubuntu-latest"
-    container: rust:1.71.0
+    container: rust:1.72.0
 
     steps:
       - name: Checkout the code on merge
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index f070c79..23e9535 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -9,7 +9,7 @@ on:
 jobs:
   lint:
     runs-on: "ubuntu-latest"
-    container: rust:1.71.0
+    container: rust:1.72.0
 
     steps:
       - uses: actions/checkout@v2
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0077509..52b0b9d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -13,7 +13,7 @@ jobs:
       matrix:
         features: ["", "--no-default-features --features rustls-native"]
     runs-on: "ubuntu-latest"
-    container: rust:1.71.0
+    container: rust:1.72.0
 
     steps:
       - uses: actions/checkout@v2
@@ -26,7 +26,7 @@ jobs:
       matrix:
         features: ["", "--no-default-features --features rustls-native"]
     runs-on: "ubuntu-latest"
-    container: rust:1.71.0
+    container: rust:1.72.0
     services:
       consul:
         image: consul:1.11.11
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 36370b6..0a59b4b 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -6,7 +6,7 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
-    container: rust:1.71.0
+    container: rust:1.72.0
     services:
       consul:
         image: consul:1.11.11
@@ -25,7 +25,7 @@ jobs:
 
   dry-run:
     runs-on: ubuntu-latest
-    container: rust:1.71.0
+    container: rust:1.72.0
 
     steps:
       - uses: actions/checkout@v2
@@ -36,7 +36,7 @@ jobs:
   publish:
     needs: [test, dry-run]
     runs-on: ubuntu-latest
-    container: rust:1.71.0
+    container: rust:1.72.0
     environment: crates-publish
 
     steps:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f2caec..40f5670 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## Unreleased
 
+## 0.4.0 - 2023-08-25
+
+### Changed
+
+- `opentelemetry` updated to version `0.20` from `0.19`.
+
+## 0.3.0 - 2023-06-19
+
 ### Added
 
 - `rustls-native` (default), and `rustls-webpki` features to allow usage of rustls for the https client.
@@ -21,14 +29,6 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - `smart_default` updated to `0.7` from `0.6`.
 - `ureq` updated to `2` from `1.5.4`.
 
-### Deprecated
-
-### Removed
-
-### Fixed
-
-### Security
-
 ## 0.2.3 - 2022-08-24
 
 - Add `datacenter` field to `Node`
diff --git a/Cargo.toml b/Cargo.toml
index d3eb588..89322cb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,8 +1,8 @@
 [package]
 name = "rs-consul"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Roblox"]
-edition = "2018"
+edition = "2021"
 description = "This crate provides access to a set of strongly typed apis to interact with consul (https://www.consul.io/)"
 readme = "README.md"
 repository = "https://github.com/Roblox/rs-consul"
@@ -24,7 +24,7 @@ http = "0.2"
 hyper = { version = "0.14", features = ["full"] }
 hyper-rustls = { version = "0.24" }
 lazy_static = { version = "1", optional = true }
-opentelemetry = { version = "0.19", features = ["rt-tokio"], optional = true }
+opentelemetry = { version = "0.20", features = ["rt-tokio"], optional = true }
 prometheus = { version = "0.13", optional = true }
 quick-error = "2"
 serde = { version = "1.0", features = ["derive"] }
diff --git a/README.md b/README.md
index 7bacf20..3ffd5e6 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ Simply include the rs-consul in your Cargo dependencies.
 
 ```toml
 [dependencies]
-rs-consul = "0.3.0"
+rs-consul = "0.4.0"
 ```
 
 ## Development
diff --git a/rust-toolchain b/rust-toolchain
index 650b514..62bafdd 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-1.71
\ No newline at end of file
+1.72
\ No newline at end of file