diff --git a/composer.json b/composer.json
index 89fe42d..14bc9a2 100644
--- a/composer.json
+++ b/composer.json
@@ -39,8 +39,7 @@
     },
     "require-dev": {
         "omnipay/tests": "^4.1",
-        "squizlabs/php_codesniffer": "^3",
-        "phpspec/prophecy-phpunit": "^2.0"
+        "squizlabs/php_codesniffer": "^3"
     },
     "extra": {
         "branch-alias": {