diff --git a/.travis.yml b/.travis.yml
index 9727208..2de646f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,8 @@ php:
   - hhvm
 #  - nightly
 
-matrix:
-  include:
-    - install: composer install --prefer-source --dev
-    - install: "sed -i 's/\"phpseclib\\/phpseclib\": \"[^\"]*/\"phpseclib\\/phpseclib\": \"2.0.0/' && composer install --prefer-source --dev"
+env:
+  - PHPSECLIB="^2.0"
+  - PHPSECLIB="2.0.0"
+
+before_script: 'sed -i "s/\"phpseclib\/phpseclib\": \"[^\"]*/\"phpseclib\/phpseclib\": \"$PHPSECLIB/" composer.json && composer install --prefer-source --dev'