diff --git a/library/development.po b/library/development.po
index e433dc6bee..6f8d3d995b 100644
--- a/library/development.po
+++ b/library/development.po
@@ -1,25 +1,27 @@
 # Copyright (C) 2001-2020, Python Software Foundation
 # This file is distributed under the same license as the Python package.
-# Maintained by the python-doc-es workteam. 
+# Maintained by the python-doc-es workteam.
 # docs-es@python.org / https://mail.python.org/mailman3/lists/docs-es.python.org/
 # Check https://github.com/python/python-docs-es/blob/3.8/TRANSLATORS to get the list of volunteers
 #
-#, fuzzy
 msgid ""
 msgstr ""
 "Project-Id-Version: Python 3.8\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2019-05-06 11:59-0400\n"
-"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
-"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"PO-Revision-Date: 2020-10-06 11:24-0500\n"
 "Language-Team: python-doc-es\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"Last-Translator: \n"
+"Language: es\n"
+"X-Generator: Poedit 2.2.1\n"
 
 #: ../Doc/library/development.rst:5
 msgid "Development Tools"
-msgstr ""
+msgstr "Herramientas de desarrollo"
 
 #: ../Doc/library/development.rst:7
 msgid ""
@@ -30,13 +32,22 @@ msgid ""
 "and verify that the expected output is produced.  :program:`2to3` can "
 "translate Python 2.x source code into valid Python 3.x code."
 msgstr ""
+"Los módulos descritos en este capítulo le ayudan a escribir software.  Por "
+"ejemplo, el módulo :mod:`pydoc` toma un módulo y genera documentación basada "
+"en el contenido del módulo.  Los módulos :mod:`doctest` y :mod:`unittest` "
+"contienen frameworks para escribir pruebas unitarias que ejecutan y validan "
+"automáticamente el código, verificando que se produce la salida esperada.  :"
+"program:`2to3` puede traducir el código fuente de Python 2.x en código "
+"válido de Python 3.x."
 
 #: ../Doc/library/development.rst:14
 msgid "The list of modules described in this chapter is:"
-msgstr ""
+msgstr "La lista de módulos descritos en este capítulo es:"
 
 #: ../Doc/library/development.rst:28
 msgid ""
 "See also the Python development mode: the :option:`-X` ``dev`` option and :"
 "envvar:`PYTHONDEVMODE` environment variable."
 msgstr ""
+"Consulta también el modo de desarrollo de Python: la opción :option:`-X` "
+"``dev`` y la variable de entorno :envvar:`PYTHONDEVMODE`."