diff --git a/.github/FUNDING.yaml b/.github/FUNDING.yaml
new file mode 100644
index 0000000..c44624b
--- /dev/null
+++ b/.github/FUNDING.yaml
@@ -0,0 +1 @@
+github: metcoder95
\ No newline at end of file
diff --git a/.github/ISSUE_TEMPLATE/bug_report.md b/.github/ISSUE_TEMPLATE/bug_report.md
deleted file mode 100644
index dd84ea7..0000000
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ /dev/null
@@ -1,38 +0,0 @@
----
-name: Bug report
-about: Create a report to help us improve
-title: ''
-labels: ''
-assignees: ''
-
----
-
-**Describe the bug**
-A clear and concise description of what the bug is.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Go to '...'
-2. Click on '....'
-3. Scroll down to '....'
-4. See error
-
-**Expected behavior**
-A clear and concise description of what you expected to happen.
-
-**Screenshots**
-If applicable, add screenshots to help explain your problem.
-
-**Desktop (please complete the following information):**
- - OS: [e.g. iOS]
- - Browser [e.g. chrome, safari]
- - Version [e.g. 22]
-
-**Smartphone (please complete the following information):**
- - Device: [e.g. iPhone6]
- - OS: [e.g. iOS8.1]
- - Browser [e.g. stock browser, safari]
- - Version [e.g. 22]
-
-**Additional context**
-Add any other context about the problem here.
diff --git a/.github/ISSUE_TEMPLATE/feature_request.md b/.github/ISSUE_TEMPLATE/feature_request.md
deleted file mode 100644
index bbcbbe7..0000000
--- a/.github/ISSUE_TEMPLATE/feature_request.md
+++ /dev/null
@@ -1,20 +0,0 @@
----
-name: Feature request
-about: Suggest an idea for this project
-title: ''
-labels: ''
-assignees: ''
-
----
-
-**Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
-
-**Describe the solution you'd like**
-A clear and concise description of what you want to happen.
-
-**Describe alternatives you've considered**
-A clear and concise description of any alternative solutions or features you've considered.
-
-**Additional context**
-Add any other context or screenshots about the feature request here.
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8e603fc..94caacc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [14.x, 16.x, 17.x]
+        node: [14.x, 16.x, 18.x]
     name: Node ${{ matrix.node }}
     steps:
       - uses: actions/checkout@v1
@@ -15,6 +15,4 @@ jobs:
         with:
           node-version: ${{ matrix.node }}
       - run: npm install
-      - run: npm run lint:ci
       - run: npm run test:ci
-      - run: npm run typescript
diff --git a/.github/workflows/pre-release.yml b/.github/workflows/pre-release.yml
new file mode 100644
index 0000000..2b7b234
--- /dev/null
+++ b/.github/workflows/pre-release.yml
@@ -0,0 +1,19 @@
+name: Pre-Release
+on:
+  push:
+    tags:
+      - 'v*.*.*-beta**'
+      - 'v*.*.*-rc**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    name: Pre-Release Creation
+    steps:
+      - uses: actions/checkout@v1
+      - uses: ncipollo/release-action@v1
+        with:
+          prerelease: true
+          bodyFile: "CHANGELOG.md"
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..9a9451c
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,18 @@
+name: Release
+on:
+  push:
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    name: Release Creation
+    steps:
+      - uses: actions/checkout@v1
+      - uses: ncipollo/release-action@v1
+        with:
+          bodyFile: "CHANGELOG.md"
+          token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/README.md b/README.md
index 0b04eab..585a8c2 100644
--- a/README.md
+++ b/README.md
@@ -28,9 +28,16 @@ const Ajv = require('ajv');
 const app = fastify();
 const validator = new Ajv({});
 
-app.register(splitValidator, { defaultValidator: validator });
+await app.register(splitValidator, { defaultValidator: validator });
 ```
 
+>**Note**:
+> It is important to advice that with the new fastify@v4, all the route registration now happens asynchronously.
+> This change translates in a way that if any plugin is meant to set logic into the `onRoute` hook for manipulating
+> routes after registration, it is necessary to await until the plugin is fully loaded before proceeding with the next parts
+> of your route definition. Otherwise, this can lead to non-deterministic behaviours when the plugin will not the expected
+> effect on your fastify application.
+
 **On Route**
 
 - `schemaValidators`: an object with the HTTP parts as keys and the validators to be used for that part as values
diff --git a/index.js b/index.js
index 03e228e..17cc360 100644
--- a/index.js
+++ b/index.js
@@ -77,6 +77,6 @@ function plugin (fastifyInstance, opts = {}, done) {
 }
 
 module.exports = fp(plugin, {
-  fastify: '>=3.24.1',
+  fastify: '>=4',
   name: 'fastify-split-validator'
 })
diff --git a/package.json b/package.json
index d65db46..c5ad993 100644
--- a/package.json
+++ b/package.json
@@ -30,9 +30,9 @@
   "author": "MetCoder95 <carlos.fuentes.rios.95@gmail.com>",
   "license": "MIT",
   "devDependencies": {
-    "@types/node": "^14.17.6",
-    "fastify": "^3.24.1",
-    "husky": "^7.0.2",
+    "@types/node": "^16.11.62",
+    "fastify": "^4.6.0",
+    "husky": "^7.0.4",
     "proxyquire": "^2.1.3",
     "snazzy": "^9.0.0",
     "standard": "^16.0.3",
@@ -41,8 +41,8 @@
     "typescript": "^4.4"
   },
   "dependencies": {
-    "ajv": "^8.6.3",
-    "fastify-plugin": "^3.0.0"
+    "ajv": "^8.11.0",
+    "fastify-plugin": "^4.2.1"
   },
   "tsd": {
     "directory": "test"
diff --git a/test/index.test.js b/test/index.test.js
index 2353413..22aa27c 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -102,7 +102,7 @@ test('Should allow custom AJV instance for body', async t => {
 
     const body = res.json()
 
-    t.equal(body.message, 'body must be array')
+    t.equal(body.message, 'body/msg must be array')
     t.equal(
       res.statusCode,
       400,
@@ -147,7 +147,7 @@ test('Should allow custom AJV instance for params', async t => {
 
     const body = res.json()
 
-    t.equal(body.message, 'params must be integer')
+    t.equal(body.message, 'params/msg must be integer')
     t.equal(
       res.statusCode,
       400,
@@ -198,7 +198,7 @@ test('Should allow custom AJV instance for headers', async t => {
     // TODO: set into documentation that it's possible the
     // error formatter doesn't work as expected.
     // Custom one should be provided
-    t.equal(body.message, 'headers must be integer')
+    t.equal(body.message, 'headers/x-type must be integer')
     t.equal(
       res.statusCode,
       400,
@@ -261,7 +261,7 @@ test('Should work with referenced schemas (querystring)', async t => {
 
     const body = res.json()
 
-    t.equal(body.message, 'querystring must be array')
+    t.equal(body.message, 'querystring/msg must be array')
     t.equal(
       res.statusCode,
       400,
@@ -313,7 +313,7 @@ test('Should work with referenced schemas (params)', async t => {
 
     const body = res.json()
 
-    t.equal(body.message, 'params must be integer')
+    t.equal(body.message, 'params/id must be integer')
     t.equal(res.statusCode, 400, 'Should not coearce the string into integer')
   } catch (err) {
     t.error(err)
@@ -364,7 +364,7 @@ test('Should work with referenced schemas (headers)', async t => {
 
     const body = res.json()
 
-    t.equal(body.message, 'headers must be integer')
+    t.equal(body.message, 'headers/x-id must be integer')
     t.equal(res.statusCode, 400, 'Should not coearce the string into integer')
   } catch (err) {
     t.error(err)
@@ -417,7 +417,7 @@ test('Should work with referenced schemas (body)', async t => {
 
     const body = res.json()
 
-    t.equal(body.message, 'body must be string')
+    t.equal(body.message, 'body/msg must be string')
     t.equal(res.statusCode, 400, 'Should not coearce the string into integer')
   } catch (err) {
     t.error(err)
@@ -485,7 +485,7 @@ test('Should work with parent and same instance schemas', async t => {
 
     const body = res.json()
 
-    t.equal(body.message, 'body must be string')
+    t.equal(body.message, 'body/msg must be string')
     t.equal(res.statusCode, 400, 'Should not coearce the string into integer')
   } catch (err) {
     t.error(err)
@@ -543,7 +543,7 @@ test('Should work with parent schemas', async t => {
 
     const body = res.json()
 
-    t.equal(body.message, 'body must be string')
+    t.equal(body.message, 'body/msg must be string')
     t.equal(res.statusCode, 400, 'Should not coearce the string into integer')
   } catch (err) {
     t.error(err)
@@ -623,9 +623,9 @@ test('Should work with parent nested schemas', async t => {
       })
     ])
 
-    t.equal(res1.json().message, 'querystring must be array')
+    t.equal(res1.json().message, 'querystring/msg must be array')
     t.equal(res1.statusCode, 400, 'Should not coearce the string into array')
-    t.equal(res2.json().message, 'headers must be integer')
+    t.equal(res2.json().message, 'headers/x-another must be integer')
     t.equal(res2.statusCode, 400, 'Should not coearce the string into integer')
   } catch (err) {
     t.error(err)
@@ -705,9 +705,9 @@ test('Should handle parsing to querystring (query)', async t => {
       })
     ])
 
-    t.equal(res1.json().message, 'querystring must be array')
+    t.equal(res1.json().message, 'querystring/msg must be array')
     t.equal(res1.statusCode, 400, 'Should not coearce the string into array')
-    t.equal(res2.json().message, 'headers must be integer')
+    t.equal(res2.json().message, 'headers/x-another must be integer')
     t.equal(res2.statusCode, 400, 'Should not coearce the string into integer')
   } catch (err) {
     t.error(err)
@@ -784,7 +784,7 @@ test('Should use default plugin validator as fallback', async t => {
       }
     })
 
-    t.equal(res.json().message, 'querystring must be array')
+    t.equal(res.json().message, 'querystring/msg must be array')
     t.equal(res.statusCode, 400, 'Should not coearce the string into array')
     t.ok(compileCalled, 'Should have called the default Ajv instance')
   } catch (err) {
@@ -807,6 +807,7 @@ test('Should always cache schema to default plugin validator', async t => {
   }
 
   headerAjv.compile = schema => {
+    console.log('called')
     customCompileCalled = true
     return headerDefaultCompile(schema)
   }
@@ -829,13 +830,13 @@ test('Should always cache schema to default plugin validator', async t => {
     }
   })
 
-  server.register((instance, opts, done) => {
+  server.register(async (instance, opts, done) => {
     instance.addSchema({
       $id: 'another',
       type: 'integer'
     })
 
-    instance.register(proxiedPlugin, {})
+    await instance.register(proxiedPlugin, {})
 
     instance.post(
       '/',
@@ -862,8 +863,6 @@ test('Should always cache schema to default plugin validator', async t => {
         reply.send({ noop: 'noop' })
       }
     )
-
-    done()
   })
 
   try {
@@ -872,10 +871,13 @@ test('Should always cache schema to default plugin validator', async t => {
       url: '/',
       query: {
         msg: ['string']
+      },
+      headers: {
+        'x-another': 1
       }
     })
 
-    t.equal(res.json().message, 'querystring must be array')
+    t.equal(res.json().message, 'querystring/msg must be array')
     t.equal(res.statusCode, 400, 'Should not coearce the string into array')
     t.ok(compileCalled, 'Should have called the default Ajv instance')
     t.ok(customCompileCalled, 'Should have called the custom Ajv instance')
@@ -948,7 +950,7 @@ test('Should use default provided validator as fallback', async t => {
       }
     })
 
-    t.equal(res.json().message, 'querystring must be array')
+    t.equal(res.json().message, 'querystring/msg must be array')
     t.equal(res.statusCode, 400, 'Should not coearce the string into array')
     t.ok(compileCalled, 'Should have called the default Ajv instance')
   } catch (err) {