diff --git a/frontend-sinatra/Gemfile.lock b/frontend-sinatra/Gemfile.lock
index 9b6ee0e..47b9527 100644
--- a/frontend-sinatra/Gemfile.lock
+++ b/frontend-sinatra/Gemfile.lock
@@ -7,15 +7,15 @@ GEM
     puma (4.3.5)
       nio4r (~> 2.0)
     rack (2.2.3)
-    rack-protection (2.0.8.1)
+    rack-protection (2.2.0)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
-    ruby2_keywords (0.0.2)
-    sinatra (2.0.8.1)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
     tilt (2.0.10)