diff --git a/ruby-sinatra/Gemfile.lock b/ruby-sinatra/Gemfile.lock
index bc54077..fc8f3b0 100644
--- a/ruby-sinatra/Gemfile.lock
+++ b/ruby-sinatra/Gemfile.lock
@@ -3,10 +3,10 @@ GEM
   specs:
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    nio4r (2.5.8)
-    puma (6.0.2)
+    nio4r (2.7.0)
+    puma (6.4.2)
       nio4r (~> 2.0)
-    rack (2.2.5)
+    rack (2.2.8.1)
     rack-protection (3.0.5)
       rack
     ruby2_keywords (0.0.5)