diff --git a/.travis.yml b/.travis.yml
index e05a88c2c7..cbe97ee896 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -32,6 +32,7 @@ jobs:
       env: VIM
       php: 7.2
       before_script:
+        - composer validate --strict
         # Install the PHP dependencies
         - composer install --optimize-autoloader --classmap-authoritative
         - bin/phpactor --version
diff --git a/composer.json b/composer.json
index 9aa873151e..f604abe90b 100644
--- a/composer.json
+++ b/composer.json
@@ -40,11 +40,7 @@
         "sebastian/diff": "^3.0",
         "symfony/filesystem": "^3.3",
         "symfony/yaml": "^3.3",
-        "webmozart/glob": "^4.1",
-        "phpactor/config-loader": "~0.1",
-        "phpactor/code-transform-extension": "^0.1",
-        "phpactor/worse-reference-finder-extension": "~0.1",
-        "phpactor/reference-finder-rpc-extension": "~0.1"
+        "webmozart/glob": "^4.1"
     },
     "require-dev": {
         "symfony/debug": "^4.0",
diff --git a/composer.lock b/composer.lock
index 8340b154f5..5c75ac7dc2 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "66ef82d258eb87d5f6920a0628944b1c",
+    "content-hash": "91622f4e29f07741752cfd43b44dd84e",
     "packages": [
         {
             "name": "composer/ca-bundle",