diff --git a/.travis.yml b/.travis.yml
index 89eeba69..200f3d6f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,10 +9,25 @@ cache:
 matrix:
     include:
         - php: 5.5
+          env: COMPOSER_VERSION=""
+        - php: 5.5
+          env: COMPOSER_VERSION="1.2.x-dev"
+        - php: 5.6
+          env: COMPOSER_VERSION=""
         - php: 5.6
+          env: COMPOSER_VERSION="1.2.x-dev"
+        - php: 7.0
+          env: COMPOSER_VERSION=""
         - php: 7.0
+          env: COMPOSER_VERSION="1.2.x-dev"
         - php: hhvm
+          env: COMPOSER_VERSION=""
+        - php: hhvm
+          env: COMPOSER_VERSION="1.2.x-dev"
+        - php: nightly
+          env: COMPOSER_VERSION=""
         - php: nightly
+          env: COMPOSER_VERSION="1.2.x-dev"
 
     allow_failures:
         - php: nightly
@@ -22,7 +37,9 @@ matrix:
 before_script:
     - composer self-update
     - composer global require --prefer-source phpunit/phpunit:"^4.8 || 5.3.*" satooshi/php-coveralls:^1.0.0
-    - composer install --prefer-source
+    - if [ "$COMPOSER_VERSION" == "" ]; then composer install --prefer-source; fi;
+    - if [ "$COMPOSER_VERSION" != "" ]; then composer require "composer/composer:${COMPOSER_VERSION}" --no-update; fi;
+    - if [ "$COMPOSER_VERSION" != "" ]; then composer update "composer/composer" --prefer-source; fi;
     - mkdir -p ./build/logs
 
 script: