diff --git a/Gemfile.lock b/Gemfile.lock
index 0070969..8c300c9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -50,6 +50,7 @@ GEM
     moneta (0.7.20)
     multi_json (1.11.2)
     netrc (0.11.0)
+    nio4r (2.3.1)
     padrino (0.12.4)
       padrino-admin (= 0.12.4)
       padrino-cache (= 0.12.4)
@@ -92,7 +93,8 @@ GEM
       slop (~> 3.4)
     pry-padrino (0.1.2)
       pry (>= 0.8)
-    puma (2.14.0)
+    puma (4.3.9)
+      nio4r (~> 2.0)
     pusher (0.15.0)
       httpclient (~> 2.5)
       multi_json (~> 1.0)