diff --git a/Gemfile.lock b/Gemfile.lock
index a8b44c5..3f6c4b2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -395,6 +395,7 @@ GEM
     netrc (0.10.3)
     nicescroll-rails (3.5.4.1)
       railties (>= 3.1)
+    nio4r (2.3.1)
     nokogiri (1.6.7.1)
       mini_portile2 (~> 2.0.0.rc2)
     nokogumbo (1.2.0)
@@ -446,13 +447,13 @@ GEM
       pry (>= 0.9.11)
     pry-vterm_aliases (1.2.0)
       pry (~> 0.10.1)
-    puma (2.11.0)
-      rack (>= 1.1, < 2.0)
+    puma (5.3.1)
+      nio4r (~> 2.0)
     queryable_array (0.0.1)
       respond_to_missing
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-contrib (1.2.0)
       rack (>= 0.9.1)
     rack-livereload (0.3.15)