diff --git a/frontend-sinatra/Gemfile.lock b/frontend-sinatra/Gemfile.lock
index 9b6ee0e..9ecb962 100644
--- a/frontend-sinatra/Gemfile.lock
+++ b/frontend-sinatra/Gemfile.lock
@@ -3,8 +3,8 @@ GEM
   specs:
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
-    nio4r (2.5.2)
-    puma (4.3.5)
+    nio4r (2.5.8)
+    puma (4.3.9)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-protection (2.0.8.1)