diff --git a/composer.json b/composer.json
index a31b15a..f8bb02f 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
         }
     ],
     "require": {
-        "beautifulsoup4",
-        "mechanize"
+        "beautifulsoup4": ">=4.4.0",
+        "mechanize": ">=0.2.5"
     }
 }