diff --git a/.travis.yml b/.travis.yml
index 793b424..5d6bcae 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,5 +7,8 @@ php:
   - 7.0
   - hhvm
   - nightly
-before_script:
-  - composer install --prefer-source --dev
+
+matrix:
+  include:
+    - install: composer install --prefer-source --dev
+    - install: "sed -i 's/\"phpseclib\\/phpseclib\": \"[^\"]*/\"phpseclib\\/phpseclib\": \"2.0.0/' && composer install --prefer-source --dev"
diff --git a/composer.json b/composer.json
index 81b0d04..96b81ab 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
     }
   ],
   "require": {
-    "phpseclib/phpseclib": "2.0.0"
+    "phpseclib/phpseclib": "^2.0"
   },
   "require-dev": {
     "phpunit/phpunit": "~4.0"