diff --git a/Gemfile b/Gemfile
index ae928cd..389171b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-source 'http://rubygems.org/'
+source 'https://rubygems.org/'
 
 gem 'ruby-macho'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index c54c16c..dbbd94b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,5 +1,5 @@
 GEM
-  remote: http://rubygems.org/
+  remote: https://rubygems.org/
   specs:
     ast (2.4.2)
     json (2.8.2)