diff --git a/examples/sinatra/Gemfile.lock b/examples/sinatra/Gemfile.lock
index 59c62bf8..53f81eb4 100644
--- a/examples/sinatra/Gemfile.lock
+++ b/examples/sinatra/Gemfile.lock
@@ -94,10 +94,10 @@ GEM
     multi_json (1.15.0)
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    nio4r (2.5.9)
+    nio4r (2.7.0)
     os (1.1.4)
     public_suffix (5.0.1)
-    puma (6.3.1)
+    puma (6.4.2)
       nio4r (~> 2.0)
     raabro (1.4.0)
     rack (2.2.7)