diff --git a/README.md b/README.md
index bcdfdfc7..b4f37887 100644
--- a/README.md
+++ b/README.md
@@ -82,18 +82,16 @@ Instalación
 
 Directamente desde la terminal con:
 
-	$ composer require sasco/libredte dev-master
+	$ composer require sasco/libredte
 
 O editando el archivo *composer.json* y agregando:
 
 	{
 		"require": {
-			 "sasco/libredte": "dev-master"
+			 "sasco/libredte": "20.7.*"
 		}
 	}
 
-Por el momento, la única versión disponible es la de desarrollo.
-
 Los ejemplos están disponibles en el directorio
 [examples](https://github.com/LibreDTE/libredte-lib/tree/master/examples).
 Los ejemplos que requieren archivos XML son casos donde el XML es entregado
diff --git a/composer.lock b/composer.lock
index 6344399a..b6692702 100644
--- a/composer.lock
+++ b/composer.lock
@@ -164,20 +164,20 @@
     "packages-dev": [
         {
             "name": "doctrine/instantiator",
-            "version": "1.3.0",
+            "version": "1.3.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "ae466f726242e637cebdd526a7d991b9433bacf1"
+                "reference": "f350df0268e904597e3bd9c4685c53e0e333feea"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/ae466f726242e637cebdd526a7d991b9433bacf1",
-                "reference": "ae466f726242e637cebdd526a7d991b9433bacf1",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/f350df0268e904597e3bd9c4685c53e0e333feea",
+                "reference": "f350df0268e904597e3bd9c4685c53e0e333feea",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "require-dev": {
                 "doctrine/coding-standard": "^6.0",
@@ -216,24 +216,24 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2019-10-21T16:45:58+00:00"
+            "time": "2020-05-29T17:27:14+00:00"
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.9.5",
+            "version": "1.10.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "b2c28789e80a97badd14145fda39b545d83ca3ef"
+                "reference": "969b211f9a51aa1f6c01d1d2aef56d3bd91598e5"
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-                "reference": "b2c28789e80a97badd14145fda39b545d83ca3ef",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/969b211f9a51aa1f6c01d1d2aef56d3bd91598e5",
+                "reference": "969b211f9a51aa1f6c01d1d2aef56d3bd91598e5",
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             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
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             "replace": {
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@@ -264,7 +264,7 @@
                 "object",
                 "object graph"
             ],
-            "time": "2020-01-17T21:11:47+00:00"
+            "time": "2020-06-29T13:22:24+00:00"
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             "name": "phar-io/manifest",
@@ -370,28 +370,25 @@
         },
         {
             "name": "phpdocumentor/reflection-common",
-            "version": "2.0.0",
+            "version": "2.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a"
+                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b"
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-                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/1d01c49d4ed62f25aa84a747ad35d5a16924662b",
+                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.1"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "~6"
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.x-dev"
+                    "dev-2.x": "2.x-dev"
                 }
             },
             "autoload": {
@@ -418,7 +415,7 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2018-08-07T13:53:10+00:00"
+            "time": "2020-06-27T09:03:43+00:00"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
@@ -475,30 +472,29 @@
         },
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             "name": "phpdocumentor/type-resolver",
-            "version": "1.1.0",
+            "version": "1.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "7462d5f123dfc080dfdf26897032a6513644fc95"
+                "reference": "e878a14a65245fbe78f8080eba03b47c3b705651"
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-                "reference": "7462d5f123dfc080dfdf26897032a6513644fc95",
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+                "reference": "e878a14a65245fbe78f8080eba03b47c3b705651",
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-                "php": "^7.2",
+                "php": "^7.2 || ^8.0",
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             },
             "require-dev": {
-                "ext-tokenizer": "^7.2",
-                "mockery/mockery": "~1"
+                "ext-tokenizer": "*"
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+                    "dev-1.x": "1.x-dev"
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@@ -517,37 +513,37 @@
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             ],
             "description": "A PSR-5 based resolver of Class names, Types and Structural Element Names",
-            "time": "2020-02-18T18:59:58+00:00"
+            "time": "2020-06-27T10:12:23+00:00"
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             "name": "phpspec/prophecy",
-            "version": "v1.10.3",
+            "version": "1.11.1",
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                 "url": "https://github.com/phpspec/prophecy.git",
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-                "php": "^5.3|^7.0",
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-                "sebastian/comparator": "^1.2.3|^2.0|^3.0|^4.0",
-                "sebastian/recursion-context": "^1.0|^2.0|^3.0|^4.0"
+                "doctrine/instantiator": "^1.2",
+                "php": "^7.2",
+                "phpdocumentor/reflection-docblock": "^5.0",
+                "sebastian/comparator": "^3.0 || ^4.0",
+                "sebastian/recursion-context": "^3.0 || ^4.0"
             },
             "require-dev": {
-                "phpspec/phpspec": "^2.5 || ^3.2",
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5 || ^7.1"
+                "phpspec/phpspec": "^6.0",
+                "phpunit/phpunit": "^8.0"
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             "type": "library",
             "extra": {
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-                    "dev-master": "1.10.x-dev"
+                    "dev-master": "1.11.x-dev"
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@@ -580,20 +576,20 @@
                 "spy",
                 "stub"
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-            "time": "2020-03-05T15:02:03+00:00"
+            "time": "2020-07-08T12:44:21+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "8.0.1",
+            "version": "8.0.2",
             "source": {
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                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "31e94ccc084025d6abee0585df533eb3a792b96a"
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@@ -644,24 +640,24 @@
                 "testing",
                 "xunit"
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-            "time": "2020-02-19T13:41:19+00:00"
+            "time": "2020-05-23T08:02:54+00:00"
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         {
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-            "version": "3.0.0",
+            "version": "3.0.4",
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+                "php": "^7.3 || ^8.0"
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@@ -694,24 +690,24 @@
                 "filesystem",
                 "iterator"
             ],
-            "time": "2020-02-07T06:05:22+00:00"
+            "time": "2020-07-11T05:18:21+00:00"
         },
         {
             "name": "phpunit/php-invoker",
-            "version": "3.0.0",
+            "version": "3.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-invoker.git",
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+                "php": "^7.3 || ^8.0"
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@@ -747,24 +743,27 @@
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-            "time": "2020-02-07T06:06:11+00:00"
+            "time": "2020-06-26T11:53:53+00:00"
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-            "version": "2.0.0",
+            "version": "2.0.2",
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@@ -793,20 +792,20 @@
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-            "time": "2020-02-01T07:43:44+00:00"
+            "time": "2020-06-26T11:55:37+00:00"
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@@ -818,7 +817,7 @@
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@@ -842,25 +841,25 @@
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-            "time": "2020-02-07T06:08:11+00:00"
+            "time": "2020-04-20T06:00:37+00:00"
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@@ -891,20 +890,20 @@
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@@ -977,24 +976,24 @@
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@@ -1022,24 +1021,24 @@
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