diff --git a/composer.json b/composer.json
index e392d1e6..d022b934 100644
--- a/composer.json
+++ b/composer.json
@@ -5,6 +5,7 @@
     "license": "MIT",
     "require": {
         "php": ">=5.5.9",
+        "ext-openssl": "*",
         "league/event": "^2.1",
         "lcobucci/jwt": "^3.1",
         "paragonie/random_compat": "^1.1",