diff --git a/Gemfile.lock b/Gemfile.lock
index 2ebbe5e5..8fe84f0f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -387,6 +387,7 @@ GEM
       activerecord (>= 3.0.0)
       activesupport (>= 3.0.0)
     newrelic_rpm (3.12.1.298)
+    nio4r (2.3.1)
     nokogiri (1.6.6.2)
       mini_portile (~> 0.6.0)
     nokogumbo (1.4.1)
@@ -447,7 +448,8 @@ GEM
       pry (~> 0.10)
     pry-rails (0.3.4)
       pry (>= 0.9.10)
-    puma (2.12.0)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
     rack (1.4.7)