diff --git a/Gemfile.lock b/Gemfile.lock
index abbaf8458cf49..5c68a1c1e2176 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -169,6 +169,7 @@ GEM
     multipart-post (2.0.0)
     mustache (0.99.8)
     netrc (0.10.3)
+    nio4r (2.5.9)
     nokogiri (1.6.6.2)
       mini_portile (~> 0.6.0)
     nokogumbo (1.2.0)
@@ -225,10 +226,10 @@ GEM
       pry (>= 0.9.10, < 0.11.0)
     pry-rails (0.3.3)
       pry (>= 0.9.10)
-    puma (2.11.1)
-      rack (>= 1.1, < 2.0)
+    puma (6.3.1)
+      nio4r (~> 2.0)
     r2 (0.2.5)
-    rack (1.5.3)
+    rack (1.5.5)
     rack-mini-profiler (0.9.3)
       rack (>= 1.1.3)
     rack-openid (1.3.1)