diff --git a/Gemfile b/Gemfile
index a2351916..2f446c95 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
-source "http://rubygems.org"
+source "https://rubygems.org"
 
 case ENV["MODEL_ADAPTER"]
 when nil, "active_record"