diff --git a/composer.json b/composer.json
index a687e7b9..d2e06c5f 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     "php": ">=5.6.0",
     "ext-json": "*",
     "guzzlehttp/guzzle": "^6.2.1 || ^7.0.1",
-    "phpseclib/phpseclib": "^2.0.11",
+    "phpseclib/phpseclib": "^2.0.11 || ^3.0.0",
     "gree/jose": "^2.2.1"
   },
   "autoload": {
diff --git a/src/Hyperwallet/Util/HyperwalletEncryption.php b/src/Hyperwallet/Util/HyperwalletEncryption.php
index 3cc5cbe6..80c9ef32 100644
--- a/src/Hyperwallet/Util/HyperwalletEncryption.php
+++ b/src/Hyperwallet/Util/HyperwalletEncryption.php
@@ -10,7 +10,7 @@
 use Hyperwallet\Response\ErrorResponse;
 use Composer\Autoload\ClassLoader;
 use phpseclib\Crypt\RSA;
-use phpseclib\Math\BigInteger;
+use Phpseclib\Math\BigInteger;
 use phpseclib\Crypt\Hash;
 use JOSE_URLSafeBase64;
 use JOSE_JWS;