diff --git a/composer.json b/composer.json
index f682d7242..2e3179d77 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
     "squizlabs/php_codesniffer": "^3.5",
     "phpunit/phpunit": "^4.8.36|^5.7",
     "sebastian/comparator": ">=1.2.3",
-    "phpseclib/phpseclib": "^2",
+    "phpseclib/phpseclib": "^2.0.31",
     "kelvinmo/simplejwt": "^0.2.5|^0.5.1"
   },
   "suggest": {