diff --git a/.dockerignore b/.dockerignore
index a839c69..29f27b6 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -7,3 +7,4 @@ fixtures/
 coverage/
 coverage.xml
 images/
+node_modules/
diff --git a/.editorconfig b/.editorconfig
index d162066..2954e68 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -7,7 +7,7 @@ trim_trailing_whitespace = true
 indent_style = space
 indent_size = 4
 
-[*.json,*.yml]
+[*.{json,yml}]
 indent_size = 2
 
 [composer.json]
diff --git a/.gitignore b/.gitignore
index f6b089b..6476dbe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,4 +4,5 @@ vendor/
 .phpls/
 composer.lock
 stubs
-*.ast
\ No newline at end of file
+*.ast
+node_modules/
diff --git a/.npmrc b/.npmrc
new file mode 100644
index 0000000..43c97e7
--- /dev/null
+++ b/.npmrc
@@ -0,0 +1 @@
+package-lock=false
diff --git a/.travis.yml b/.travis.yml
index 05ebb2a..16dcb76 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,10 +11,10 @@ services:
 cache:
   directories:
     - $HOME/.composer/cache
+    - $HOME/.npm
 
 install:
   - composer install --prefer-dist --no-interaction
-  - composer run-script parse-stubs
 
 script:
   - vendor/bin/phpcs -n
@@ -22,9 +22,12 @@ script:
 
 after_success:
   - bash <(curl -s https://codecov.io/bash)
-  - |
-    if [[ $TRAVIS_TAG == v* ]]; then
-      docker build -t felixfbecker/php-language-server:${TRAVIS_TAG:1} .
-      docker login -e="$DOCKER_EMAIL" -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD"
-      docker push felixfbecker/php-language-server:${TRAVIS_TAG:1}
-    fi
+  - git config --replace-all remote.origin.fetch +refs/heads/*:refs/remotes/origin/*
+  - git fetch --tags
+  - nvm install 8 && nvm use 8
+  - npm install
+  - npm run semantic-release
+
+branches:
+  except:
+    - /^v\d+\.\d+\.\d+$/
diff --git a/README.md b/README.md
index 3745ff6..0aad4e5 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@
 [![Build Status](https://travis-ci.org/felixfbecker/php-language-server.svg?branch=master)](https://travis-ci.org/felixfbecker/php-language-server)
 [![Coverage](https://codecov.io/gh/felixfbecker/php-language-server/branch/master/graph/badge.svg)](https://codecov.io/gh/felixfbecker/php-language-server)
 [![Dependency Status](https://gemnasium.com/badges/github.com/felixfbecker/php-language-server.svg)](https://gemnasium.com/github.com/felixfbecker/php-language-server)
+[![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
 [![Minimum PHP Version](https://img.shields.io/badge/php-%3E%3D%207.0-8892BF.svg)](https://php.net/)
 [![License](https://img.shields.io/packagist/l/felixfbecker/language-server.svg)](https://github.com/felixfbecker/php-language-server/blob/master/LICENSE.txt)
 [![Gitter](https://badges.gitter.im/felixfbecker/php-language-server.svg)](https://gitter.im/felixfbecker/php-language-server?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
diff --git a/composer.json b/composer.json
index 225de3b..0504c00 100644
--- a/composer.json
+++ b/composer.json
@@ -23,11 +23,11 @@
     "require": {
         "php": "^7.0",
         "composer/composer": "^1.3",
-        "felixfbecker/advanced-json-rpc": "^2.0",
+        "felixfbecker/advanced-json-rpc": "^3.0.0",
         "jetbrains/phpstorm-stubs": "dev-master",
         "microsoft/tolerant-php-parser": "^0.0.6",
         "netresearch/jsonmapper": "^1.0",
-        "phpdocumentor/reflection-docblock": "~3.1.1",
+        "phpdocumentor/reflection-docblock": "^4.0.0",
         "sabre/event": "^5.0",
         "sabre/uri": "^2.0",
         "squizlabs/php_codesniffer": "3.0.0RC3",
diff --git a/dependencies.yml b/dependencies.yml
new file mode 100644
index 0000000..320ae87
--- /dev/null
+++ b/dependencies.yml
@@ -0,0 +1,10 @@
+collectors:
+
+- type: php-composer
+  path: /
+  actors:
+  # pull requests for new major versions
+  - type: php-composer
+    versions: "Y.0.0"
+    settings:
+      commit_message_prefix: "chore: "
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..d67062f
--- /dev/null
+++ b/package.json
@@ -0,0 +1,28 @@
+{
+  "name": "php-language-server",
+  "version": "0.0.0-development",
+  "private": true,
+  "scripts": {
+    "commitmsg": "validate-commit-msg",
+    "semantic-release": "semantic-release pre && ./release-docker.sh && semantic-release post"
+  },
+  "devDependencies": {
+    "cz-conventional-changelog": "^2.0.0",
+    "husky": "^0.14.3",
+    "last-release-git": "0.0.3",
+    "semantic-release": "^8.2.0",
+    "validate-commit-msg": "^2.14.0"
+  },
+  "config": {
+    "commitizen": {
+      "path": "./node_modules/cz-conventional-changelog"
+    }
+  },
+  "release": {
+    "getLastRelease": "last-release-git"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/felixfbecker/php-language-server.git"
+  }
+}
diff --git a/release-docker.sh b/release-docker.sh
new file mode 100644
index 0000000..35e89d9
--- /dev/null
+++ b/release-docker.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+set -e
+
+docker build -t felixfbecker/php-language-server:${TRAVIS_TAG:1} .
+docker login -e="$DOCKER_EMAIL" -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD"
+docker push felixfbecker/php-language-server:${TRAVIS_TAG:1}
diff --git a/src/Definition.php b/src/Definition.php
index c03e852..9a485c4 100644
--- a/src/Definition.php
+++ b/src/Definition.php
@@ -78,7 +78,7 @@ class Definition
      * For functions and methods, this is the return type.
      * For any other declaration it will be null.
      * Can also be a compound type.
-     * If it is unknown, will be Types\Mixed.
+     * If it is unknown, will be Types\Mixed_.
      *
      * @var \phpDocumentor\Type|null
      */
diff --git a/src/DefinitionResolver.php b/src/DefinitionResolver.php
index 51c5955..dd1040e 100644
--- a/src/DefinitionResolver.php
+++ b/src/DefinitionResolver.php
@@ -551,7 +551,7 @@ class DefinitionResolver
 
     /**
      * Given an expression node, resolves that expression recursively to a type.
-     * If the type could not be resolved, returns Types\Mixed.
+     * If the type could not be resolved, returns Types\Mixed_.
      *
      * @param Node\Expression $expr
      * @return \phpDocumentor\Reflection\Type|null
@@ -567,7 +567,7 @@ class DefinitionResolver
         if ($expr == null || $expr instanceof PhpParser\MissingToken || $expr instanceof PhpParser\SkippedToken) {
             // TODO some members are null or Missing/SkippedToken
             // How do we handle this more generally?
-            return new Types\Mixed;
+            return new Types\Mixed_;
         }
 
         // VARIABLE
@@ -597,7 +597,7 @@ class DefinitionResolver
             // Find the function definition
             if ($expr->callableExpression instanceof Node\Expression) {
                 // Cannot get type for dynamic function call
-                return new Types\Mixed;
+                return new Types\Mixed_;
             }
 
             if ($expr->callableExpression instanceof Node\QualifiedName) {
@@ -646,7 +646,7 @@ class DefinitionResolver
         // MEMBER ACCESS EXPRESSION
         if ($expr instanceof Node\Expression\MemberAccessExpression) {
             if ($expr->memberName instanceof Node\Expression) {
-                return new Types\Mixed;
+                return new Types\Mixed_;
             }
             $var = $expr->dereferencableExpression;
 
@@ -659,10 +659,10 @@ class DefinitionResolver
                 if ($t instanceof Types\This) {
                     $classFqn = self::getContainingClassFqn($expr);
                     if ($classFqn === null) {
-                        return new Types\Mixed;
+                        return new Types\Mixed_;
                     }
                 } else if (!($t instanceof Types\Object_) || $t->getFqsen() === null) {
-                    return new Types\Mixed;
+                    return new Types\Mixed_;
                 } else {
                     $classFqn = substr((string)$t->getFqsen(), 1);
                 }
@@ -689,7 +689,7 @@ class DefinitionResolver
         if ($expr instanceof Node\Expression\ScopedPropertyAccessExpression) {
             $classType = $this->resolveClassNameToType($expr->scopeResolutionQualifier);
             if (!($classType instanceof Types\Object_) || $classType->getFqsen() === null) {
-                return new Types\Mixed;
+                return new Types\Mixed_;
             }
             $fqn = substr((string)$classType->getFqsen(), 1) . '::';
 
@@ -701,7 +701,7 @@ class DefinitionResolver
 
             $def = $this->index->getDefinition($fqn);
             if ($def === null) {
-                return new Types\Mixed;
+                return new Types\Mixed_;
             }
             return $def->type;
         }
@@ -888,7 +888,7 @@ class DefinitionResolver
         if ($expr instanceof Node\Expression\SubscriptExpression) {
             $varType = $this->resolveExpressionNodeToType($expr->postfixExpression);
             if (!($varType instanceof Types\Array_)) {
-                return new Types\Mixed;
+                return new Types\Mixed_;
             }
             return $varType->getValueType();
         }
@@ -897,14 +897,14 @@ class DefinitionResolver
         //   include, require, include_once, require_once
         if ($expr instanceof Node\Expression\ScriptInclusionExpression) {
             // TODO: resolve path to PhpDocument and find return statement
-            return new Types\Mixed;
+            return new Types\Mixed_;
         }
 
         if ($expr instanceof Node\QualifiedName) {
             return $this->resolveClassNameToType($expr);
         }
 
-        return new Types\Mixed;
+        return new Types\Mixed_;
     }
 
 
@@ -918,7 +918,7 @@ class DefinitionResolver
     public function resolveClassNameToType($class): Type
     {
         if ($class instanceof Node\Expression) {
-            return new Types\Mixed;
+            return new Types\Mixed_;
         }
         if ($class instanceof PhpParser\Token && $class->kind === PhpParser\TokenKind::ClassKeyword) {
             // Anonymous class
@@ -958,7 +958,7 @@ class DefinitionResolver
      * For classes and interfaces, this is the class type (object).
      * For variables / assignments, this is the documented type or type the assignment resolves to.
      * Can also be a compound type.
-     * If it is unknown, will be Types\Mixed.
+     * If it is unknown, will be Types\Mixed_.
      * Returns null if the node does not have a type.
      *
      * @param Node $node
@@ -1012,7 +1012,7 @@ class DefinitionResolver
                 }
                 $type = $defaultType;
             }
-            return $type ?? new Types\Mixed;
+            return $type ?? new Types\Mixed_;
         }
 
         // FUNCTIONS AND METHODS
@@ -1040,7 +1040,7 @@ class DefinitionResolver
                 return new Types\Object_(new Fqsen('\\' . (string)$node->returnType->getResolvedName()));
             }
             // Unknown return type
-            return new Types\Mixed;
+            return new Types\Mixed_;
         }
 
         // PROPERTIES, CONSTS, CLASS CONSTS, ASSIGNMENT EXPRESSIONS
@@ -1077,7 +1077,7 @@ class DefinitionResolver
             // TODO: read @property tags of class
             // TODO: Try to infer the type from default value / constant value
             // Unknown
-            return new Types\Mixed;
+            return new Types\Mixed_;
         }
 
         // The node does not have a type