diff --git a/Gemfile.lock b/Gemfile.lock
index e97c995..8193012 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,6 +107,7 @@ GEM
     multi_json (1.11.2)
     multi_xml (0.5.5)
     multipart-post (2.0.0)
+    nio4r (2.5.8)
     nokogiri (1.6.6.2)
       mini_portile (~> 0.6.0)
     oauth (0.4.7)
@@ -144,7 +145,8 @@ GEM
       pry (~> 0.10)
     pry-rails (0.3.4)
       pry (>= 0.9.10)
-    puma (2.14.0)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (1.6.4)
     rack-protection (1.5.3)
       rack