diff --git a/README.rst b/README.rst
index 266f0f4..0103581 100644
--- a/README.rst
+++ b/README.rst
@@ -4,13 +4,13 @@ wtforms-json
 Adds smart json support for `WTForms`_. Useful for when using WTForms with
 RESTful APIs.
 
-.. _WTForms: https://wtforms.readthedocs.org/en/latest/
+.. _WTForms: https://wtforms.readthedocs.io/en/latest/
 
 
 Resources
 ---------
 
-- `Documentation <http://wtforms-json.readthedocs.org/>`_
+- `Documentation <https://wtforms-json.readthedocs.io/>`_
 - `Issue Tracker <http://github.com/kvesteri/wtforms-json/issues>`_
 - `Code <http://github.com/kvesteri/wtforms-json/>`_
 
diff --git a/docs/conf.py b/docs/conf.py
index e7dbf80..803c20e 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -245,5 +245,5 @@
 
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {
-    'wtforms': ('http://wtforms.readthedocs.org/en/latest/', None)
+    'wtforms': ('https://wtforms.readthedocs.io/en/latest/', None)
 }
diff --git a/docs/index.rst b/docs/index.rst
index 32766ff..e5546f5 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -3,7 +3,7 @@ WTForms-JSON
 
 WTForms-JSON is a `WTForms`_ extension for JSON data handling.
 
-.. _WTForms: https://wtforms.readthedocs.org/en/latest/
+.. _WTForms: https://wtforms.readthedocs.io/en/latest/
 
 What does it do?
 ----------------