diff --git a/composer.json b/composer.json
index 5edc9aa..447ea32 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     "require": {
         "php": "^7.1|^8.0",
         "intervention/image": "^2.4",
-        "phpseclib/phpseclib": "^2.0"
+        "phpseclib/phpseclib": "^3.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^7|^8|^9",
diff --git a/src/Hash.php b/src/Hash.php
index 716fa20..02ea862 100644
--- a/src/Hash.php
+++ b/src/Hash.php
@@ -3,7 +3,7 @@
 namespace Jenssegers\ImageHash;
 
 use JsonSerializable;
-use phpseclib\Math\BigInteger;
+use phpseclib3\Math\BigInteger;
 
 class Hash implements JsonSerializable
 {