diff --git a/composer.json b/composer.json
index a7414e3..0a281bd 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
     "type": "metapackage",
     "require": {
         "knplabs/gaufrette": "~0.3",
-        "phpseclib/phpseclib": "^2.0"
+        "phpseclib/phpseclib": "^2.0|^3.0.34"
     },
     "authors": [
         {