diff --git a/composer.json b/composer.json
index af5781a..bcecdce 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
     ],
     "require": {
         "php": ">=7.1",
-        "yosymfony/parser-utils": "1.0.x-dev"
+        "yosymfony/parser-utils": "^1.0"
     },
     "autoload": {
         "psr-4": { "Yosymfony\\Toml\\": "src/" }
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..f41d3c6
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,67 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "bd8a995beb4e5c7abe13b0b1ad032f1a",
+    "packages": [
+        {
+            "name": "yosymfony/parser-utils",
+            "version": "v1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/yosymfony/parser-utils.git",
+                "reference": "5376469d996a8f09139c0c795048b1140d143281"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/yosymfony/parser-utils/zipball/5376469d996a8f09139c0c795048b1140d143281",
+                "reference": "5376469d996a8f09139c0c795048b1140d143281",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Yosymfony\\ParserUtils\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Victor Puertas",
+                    "email": "vpgugr@gmail.com",
+                    "homepage": "http://yosymfony.com"
+                }
+            ],
+            "description": "Parser utilities",
+            "homepage": "http://github.com/yosymfony/toml",
+            "keywords": [
+                "lexer",
+                "parser"
+            ],
+            "time": "2017-11-18T22:30:41+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": ">=7.1"
+    },
+    "platform-dev": []
+}