1 files changed, 5 insertions, 1 deletions
diff --git a/composer.json b/composer.json
index 01b16bc..086f4c5 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,8 @@
     "license" : "BSD-2-Clause",
     "homepage": "https://github.com/Bacon/BaconQrCode",
     "require": {
-        "php": ">=5.3.3"
+        "php": "^5.4|^7.0",
+        "ext-iconv": "*"
     },
     "suggest": {
         "ext-gd": "to generate QR code images"
@@ -21,5 +22,8 @@
         "psr-0": {
             "BaconQrCode": "src/"
         }
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^4.8"
     }
 }