diff --git a/.travis.yml b/.travis.yml
index 34b6f96..00ab923 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,6 @@
 language: php
 matrix:
   include:
-    - php: 5.2
-      dist: precise
     - php: 5.3
       dist: precise
     - php: 5.4
diff --git a/README.md b/README.md
index b7b9707..0449347 100644
--- a/README.md
+++ b/README.md
@@ -410,6 +410,8 @@ element, you can do this:
 
 ## Changelog
 
+- 2.1.1 (2017/12/12)
+  - added compatibility to symfony/yaml 4.x
 - 2.1.0 (2017/03/13)
   - added `\` to escape dots in path
 - 2.0.1 (2016/06/28)
diff --git a/composer.json b/composer.json
index 5176d14..51ad3b3 100644
--- a/composer.json
+++ b/composer.json
@@ -11,9 +11,9 @@
     ],
     "require": {
         "php": ">=5.3.0",
-        "dracoblue/naith": "1.1.*",
-        "phpoffice/phpexcel": "1.7.*",
-        "symfony/yaml": ">=2.0 <4.0"
+        "dracoblue/naith": "^1.1",
+        "phpoffice/phpexcel": "^1.7",
+        "symfony/yaml": "^2.0 || ^3.0 || ^4.0"
     },
     "autoload": {
         "classmap": [ "src/" ]