diff --git a/docs/Makefile b/docs/Makefile
index 0fd0c1e..820fe11 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/conf.py b/docs/conf.py
index eedb46c..8fbfe9e 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -3,7 +3,7 @@ Sphinx documentation generator configuration.
 
 More information on the configuration options is available at:
 
-    http://www.sphinx-doc.org/en/master/usage/configuration.html
+    https://www.sphinx-doc.org/en/master/usage/configuration.html
 """
 
 import sphinx_rtd_theme