diff --git a/composer.json b/composer.json
index cfe46d1..7ae8eeb 100644
--- a/composer.json
+++ b/composer.json
@@ -14,6 +14,10 @@
         "dnadesign/silverstripe-elemental": "2.x-dev",
         "silverstripe/vendor-plugin": "^1.0"
     },
+    "require-dev": {
+        "phpunit/phpunit": "^5.7",
+        "squizlabs/php_codesniffer": "^3.0"
+    },
     "extra": {
         "branch-alias": {
             "dev-master": "1.x-dev"