diff --git a/Gemfile b/Gemfile
index 41d8619d..4cc74706 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
-source "http://rubygems.org"
+source "https://rubygems.org"
 
 def darwin_only(require_as)
   RUBY_PLATFORM.include?('darwin') && require_as