diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2fcdee7..ba8ec0e 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]
 
+## [5.1.0] - 2020-09-22
+
+### Changed
+
+- Update RPC packages ([#40](https://github.com/MetaMask/eth-json-rpc-infura/pull/40))
+  - `json-rpc-engine@5.3.0`
+  - `eth-json-rpc-middleware@6.0.0`
+
 ## [5.0.0] - 2020-09-08
 
 ### Changed
@@ -20,6 +28,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Use `eth-rpc-errors@3.0.0` ([#28](https://github.com/MetaMask/eth-json-rpc-infura/pull/28))
 - Use `eth-json-rpc-middleware@4.4.1` ([#15](https://github.com/MetaMask/eth-json-rpc-infura/pull/15))
 
-[Unreleased]:https://github.com/MetaMask/eth-json-rpc-infura/compare/v5.0.0...HEAD
+[Unreleased]:https://github.com/MetaMask/eth-json-rpc-infura/compare/v5.1.0...HEAD
+[5.1.0]:https://github.com/MetaMask/eth-json-rpc-infura/compare/v5.0.0...v5.1.0
 [5.0.0]:https://github.com/MetaMask/eth-json-rpc-infura/compare/v4.1.0...v5.0.0
 [4.1.0]:https://github.com/MetaMask/eth-json-rpc-infura/compare/v4.0.2...v4.1.0
diff --git a/package.json b/package.json
index a7e2648..799bdb3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "eth-json-rpc-infura",
-  "version": "5.0.0",
+  "version": "5.1.0",
   "main": "src/index.js",
   "directories": {
     "test": "test"
diff --git a/src/index.js b/src/index.js
index 8d5304e..72fbdd4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,5 +1,5 @@
 const createAsyncMiddleware = require('json-rpc-engine/src/createAsyncMiddleware')
-const { ethErrors: rpcErrors } = require('eth-rpc-errors')
+const { ethErrors } = require('eth-rpc-errors')
 const fetch = require('node-fetch')
 
 const RETRIABLE_ERRORS = [
@@ -80,7 +80,7 @@ async function performFetch (network, projectId, extraHeaders, req, res, source)
   if (!response.ok) {
     switch (response.status) {
       case 405:
-        throw rpcErrors.rpc.methodNotFound()
+        throw ethErrors.rpc.methodNotFound()
 
       case 429:
         throw createRatelimitError()
@@ -151,5 +151,5 @@ function createTimeoutError () {
 }
 
 function createInternalError (msg) {
-  return rpcErrors.rpc.internal(msg)
+  return ethErrors.rpc.internal(msg)
 }