diff --git a/Gemfile.lock b/Gemfile.lock
index 170a14b..35d3e37 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -259,7 +259,8 @@ GEM
     pry-rails (0.3.5)
       pry (>= 0.9.10)
     public_suffix (4.0.1)
-    puma (3.9.1)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     pundit (1.1.0)
       activesupport (>= 3.0.0)
     rack (2.0.7)