diff --git a/doc/intro.rst b/doc/intro.rst
index e31cd9bd8..dd73aca0b 100644
--- a/doc/intro.rst
+++ b/doc/intro.rst
@@ -27,9 +27,9 @@ severity of the warnings and errors.
 .. _pyflakes: https://github.com/pyflakes/pyflakes
 .. _flake8: https://gitlab.com/pycqa/flake8/
 .. _mypy: https://github.com/JukkaL/mypy
-.. _`PEP 008`: http://www.python.org/dev/peps/pep-0008/
+.. _`PEP 008`: https://www.python.org/dev/peps/pep-0008/
 .. _`Guido's style guide`: https://www.python.org/doc/essays/styleguide/
-.. _`refactoring book`: http://www.refactoring.com/
+.. _`refactoring book`: https://www.refactoring.com/
 
 What Pylint is not?
 -------------------