diff --git a/Gemfile b/Gemfile
index 9509ba661..f164e420e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@
 
 ruby "3.2.3"
 
-source "https://rubygems.org"
+source "http://rubygems.org"
 
 gem "activesupport"
 gem "asciidoctor-diagram", "~> 2.2"
diff --git a/Gemfile.lock b/Gemfile.lock
index 9177f572a..6971b29b6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,5 +1,5 @@
 GEM
-  remote: https://rubygems.org/
+  remote: http://rubygems.org/
   specs:
     Ascii85 (1.1.1)
     activesupport (8.0.0)