diff --git a/Gemfile.lock b/Gemfile.lock
index e5c0849..f11cbb2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -143,7 +143,8 @@ GEM
     pg (0.19.0)
     pkg-config (1.1.9)
     pr_geohash (1.0.0)
-    puma (3.11.3)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     pundit (1.1.0)
       activesupport (>= 3.0.0)
     rack (2.0.4)