diff --git a/contributing/documentation/format.rst b/contributing/documentation/format.rst
index 9fcdebd69f7..8ab114f993a 100644
--- a/contributing/documentation/format.rst
+++ b/contributing/documentation/format.rst
@@ -211,9 +211,9 @@ Symfony 4.0 were released today, 3.0 to 3.4 ``versionadded`` and ``deprecated``
 tags would be removed from the new ``4.0`` branch.
 
 .. _reStructuredText: http://docutils.sourceforge.net/rst.html
-.. _Sphinx: http://sphinx-doc.org/
+.. _Sphinx: https://www.sphinx-doc.org/
 .. _`Symfony documentation`: https://github.com/symfony/symfony-docs
-.. _`reStructuredText Primer`: http://sphinx-doc.org/rest.html
+.. _`reStructuredText Primer`: https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html
 .. _`reStructuredText Reference`: http://docutils.sourceforge.net/docs/user/rst/quickref.html
-.. _`Sphinx Markup Constructs`: http://sphinx-doc.org/markup/
+.. _`Sphinx Markup Constructs`: https://www.sphinx-doc.org/en/1.7/markup/index.html
 .. _`supported languages`: http://pygments.org/languages/
diff --git a/reference/configuration/doctrine.rst b/reference/configuration/doctrine.rst
index 775ab1dbce2..b657136a734 100644
--- a/reference/configuration/doctrine.rst
+++ b/reference/configuration/doctrine.rst
@@ -157,7 +157,7 @@ which is the first one defined or the one configured via the
 Each connection is also accessible via the ``doctrine.dbal.[name]_connection``
 service where ``[name]`` is the name of the connection.
 
-.. _DBAL documentation: http://docs.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/configuration.html
+.. _DBAL documentation: https://docs.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/configuration.html
 
 Doctrine ORM Configuration
 --------------------------
@@ -447,4 +447,4 @@ If the ``dir`` configuration is set and the ``is_bundle`` configuration
 is ``true``, the DoctrineBundle will prefix the ``dir`` configuration with
 the path of the bundle.
 
-.. _`DQL User Defined Functions`: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/cookbook/dql-user-defined-functions.html
+.. _`DQL User Defined Functions`: https://docs.doctrine-project.org/projects/doctrine-orm/en/latest/cookbook/dql-user-defined-functions.html