diff --git a/Gemfile.lock b/Gemfile.lock
index 57e3e91..6f9ea59 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -208,6 +208,7 @@ GEM
     net-ssh-gateway (1.2.0)
       net-ssh (>= 2.6.5)
     newrelic_rpm (3.9.5.251)
+    nio4r (2.5.8)
     nokogiri (1.6.3.1)
       mini_portile (= 0.6.0)
     non-stupid-digest-assets (1.0.4)
@@ -216,11 +217,11 @@ GEM
     polyamorous (1.1.0)
       activerecord (>= 3.0)
     polyglot (0.3.5)
-    puma (2.9.1)
-      rack (>= 1.1, < 2.0)
+    puma (5.6.2)
+      nio4r (~> 2.0)
     quiet_assets (1.0.3)
       railties (>= 3.1, < 5.0)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.2)