diff --git a/composer.json b/composer.json
index 4b065d3c..dd02ca7b 100644
--- a/composer.json
+++ b/composer.json
@@ -39,8 +39,9 @@
 		"ext-posix" : "*",
 		"ext-mbstring" : "*",
 		"ext-curl" : "*",
-		"ext-json" : "*"
-	},
+		"ext-json" : "*",
+		"ext-openssl": "*"
+    },
 	"require-dev" : {
 		"phpunit/phpunit" : "6.5.13",
 		"pdepend/pdepend" : "2.5.0",