diff --git a/ruby/Gemfile.lock b/ruby/Gemfile.lock
index 65c559d..d9fb084 100644
--- a/ruby/Gemfile.lock
+++ b/ruby/Gemfile.lock
@@ -27,7 +27,7 @@ GEM
     nokogiri (1.10.3)
       mini_portile2 (~> 2.4.0)
     public_suffix (3.1.1)
-    rack (2.0.7)
+    rack (2.0.8)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     regexp_parser (1.5.1)