diff --git a/.travis.yml b/.travis.yml
index 7a61572..d87306b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,3 +10,4 @@ before_script:
 script:
  - vendor/bin/phpcs --standard=psr2 src
  - vendor/bin/phpunit --debug
+ - vendor/bin/phpmd src text codesize,unusedcode,naming
diff --git a/composer.json b/composer.json
index a85bdbe..dcb7aed 100644
--- a/composer.json
+++ b/composer.json
@@ -21,6 +21,7 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.7"
+        "phpunit/phpunit": "^5.7",
+        "phpmd/phpmd": "^2.5"
     }
 }