diff --git a/Formula/igraph.rb b/Formula/igraph.rb
index 4bf0ad5865..cd5075e65d 100644
--- a/Formula/igraph.rb
+++ b/Formula/igraph.rb
@@ -1,7 +1,7 @@
 class Igraph < Formula
   desc "Network analysis package"
-  homepage "http://igraph.org"
-  url "http://igraph.org/nightly/get/c/igraph-0.7.1.tar.gz"
+  homepage "https://igraph.org/"
+  url "https://igraph.org/nightly/get/c/igraph-0.7.1.tar.gz"
   sha256 "d978030e27369bf698f3816ab70aa9141e9baf81c56cc4f55efbe5489b46b0df"
   revision 6