diff --git a/Gemfile.lock b/Gemfile.lock
index 6d1ecb9..920f7f3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -51,7 +51,7 @@ GEM
     nokogiri (1.8.4-x86-mingw32)
       mini_portile2 (~> 2.3.0)
     public_suffix (3.0.3)
-    rack (2.0.5)
+    rack (2.0.8)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rspec (3.8.0)