diff --git a/Gemfile.lock b/Gemfile.lock
index e6ee1e3b..a8dd7124 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -306,6 +306,7 @@ GEM
     mustache (1.0.5)
     netrc (0.11.0)
     newrelic_rpm (5.4.0.347)
+    nio4r (2.5.8)
     nokogiri (1.10.2)
       mini_portile2 (~> 2.4.0)
     non-stupid-digest-assets (1.0.9)
@@ -317,7 +318,8 @@ GEM
     pg (0.21.0)
     powerpack (0.1.2)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (1.6.11)
     rack-plastic (0.1.3)
       nokogiri (~> 1.4)