diff --git a/api/ruby/basics-of-authentication/Gemfile.lock b/api/ruby/basics-of-authentication/Gemfile.lock
index 3defdcc42..9d1adc8d4 100644
--- a/api/ruby/basics-of-authentication/Gemfile.lock
+++ b/api/ruby/basics-of-authentication/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
     mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     netrc (0.11.0)
-    rack (2.2.6.4)
+    rack (2.2.8.1)
     rack-protection (2.2.3)
       rack
     rest-client (1.8.0)