diff --git a/Gemfile.lock b/Gemfile.lock
index f7e6cabbb..23ca44814 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -201,6 +201,7 @@ GEM
     mysql2 (0.3.18)
     nenv (0.3.0)
     net-ldap (0.11)
+    nio4r (2.5.8)
     nokogiri (1.6.7.2)
       mini_portile2 (~> 2.0.0.rc2)
     notiffany (0.0.8)
@@ -231,7 +232,8 @@ GEM
       activerecord (>= 3.0)
       i18n (>= 0.5.0)
       railties (>= 3.0.0)
-    puma (2.14.0)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     pundit (1.0.1)
       activesupport (>= 3.0.0)
     quiet_assets (1.1.0)