diff --git a/composer.json b/composer.json
index 61d30dc2..38554a24 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
         "guzzlehttp/guzzle": "^6.3|^7.0",
         "PHP": "^7.2|^8.0",
         "kornrunner/keccak": "~1.0",
-        "phpseclib/phpseclib": "~2.0.30",
+        "phpseclib/phpseclib": "~3.0.43",
         "ext-mbstring": "*",
         "react/http": "^1.6.0",
         "react/async": "^4.0.0|^3.1.0",