diff --git a/.editorconfig b/.editorconfig
index 058a363..67db007 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -1,4 +1,4 @@
-# http://editorconfig.org
+# https://editorconfig.org
 
 root = true
 
diff --git a/CHANGES.rst b/CHANGES.rst
index 09d39ca..f6cb6cc 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -249,7 +249,7 @@ Changelog
   for the report.  Thanks Matthew Schinckel for the fix.  Merge of GH-130,
   fixes GH-83.
 
-.. _IPython: http://ipython.org/
+.. _IPython: https://ipython.org/
 
 
 2.0.3 (2014.03.19)
diff --git a/docs/Makefile b/docs/Makefile
index 452f59f..c6c45a3 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -9,7 +9,7 @@ BUILDDIR      = _build
 
 # User-friendly check for sphinx-build
 ifeq ($(shell which $(SPHINXBUILD) >/dev/null 2>&1; echo $$?), 1)
-$(error The '$(SPHINXBUILD)' command was not found. Make sure you have Sphinx installed, then set the SPHINXBUILD environment variable to point to the full path of the '$(SPHINXBUILD)' executable. Alternatively you can add the directory with the executable to your PATH. If you don't have Sphinx installed, grab it from http://sphinx-doc.org/)
+$(error The '$(SPHINXBUILD)' command was not found. Make sure you have Sphinx installed, then set the SPHINXBUILD environment variable to point to the full path of the '$(SPHINXBUILD)' executable. Alternatively you can add the directory with the executable to your PATH. If you don't have Sphinx installed, grab it from https://sphinx-doc.org/)
 endif
 
 # Internal variables.
diff --git a/docs/make.bat b/docs/make.bat
index fb1a0ef..b593358 100644
--- a/docs/make.bat
+++ b/docs/make.bat
@@ -56,7 +56,7 @@ if errorlevel 9009 (
 	echo.may add the Sphinx directory to PATH.
 	echo.
 	echo.If you don't have Sphinx installed, grab it from
-	echo.http://sphinx-doc.org/
+	echo.https://sphinx-doc.org/
 	exit /b 1
 )
 
diff --git a/docs/managers.rst b/docs/managers.rst
index 0d07a96..54aff0a 100644
--- a/docs/managers.rst
+++ b/docs/managers.rst
@@ -84,7 +84,7 @@ If you don't explicitly call ``select_subclasses()`` or ``get_subclass()``,
 an ``InheritanceManager`` behaves identically to a normal ``Manager``; so
 it's safe to use as your default manager for the model.
 
-.. _contributed by Jeff Elmore: http://jeffelmore.org/2010/11/11/automatic-downcasting-of-inherited-models-in-django/
+.. _contributed by Jeff Elmore: https://jeffelmore.org/2010/11/11/automatic-downcasting-of-inherited-models-in-django/
 
 JoinManager
 -----------
diff --git a/docs/setup.rst b/docs/setup.rst
index 69c9840..ad01f8a 100644
--- a/docs/setup.rst
+++ b/docs/setup.rst
@@ -20,4 +20,4 @@ Dependencies
 ``django-model-utils`` supports `Django`_ 3.2+ (latest bugfix
 release in each series only) on Python 3.7+.
 
-.. _Django: http://www.djangoproject.com/
+.. _Django: https://www.djangoproject.com/