diff --git a/Gemfile.lock b/Gemfile.lock
index 4c617a3..2e980a3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -88,11 +88,13 @@ GEM
     multi_json (1.11.2)
     mysql2 (0.4.2)
     newrelic_rpm (3.14.2.312)
+    nio4r (2.5.2)
     nokogiri (1.6.7.2)
       mini_portile2 (~> 2.0.0.rc2)
     pg (0.18.4)
     phantomjs (2.1.1.0)
-    puma (2.16.0)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (1.6.4)
     rack-test (0.6.3)
       rack (>= 1.0)