diff --git a/Gemfile.lock b/Gemfile.lock
index 70d06d4..8e29a0e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -188,6 +188,7 @@ GEM
     nested_form (0.3.2)
     net-http-persistent (2.9.4)
     newrelic_rpm (3.11.2.286)
+    nio4r (2.5.2)
     nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
     normalize-rails (3.0.2)
@@ -198,7 +199,8 @@ GEM
       slop (~> 3.4)
     pry-rails (0.3.4)
       pry (>= 0.9.10)
-    puma (3.12.4)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     rack (1.6.13)
     rack-pjax (1.1.0)
       nokogiri (~> 1.5)