diff --git a/Gemfile.lock b/Gemfile.lock
index 017378b..9126c9f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -57,7 +57,9 @@ GEM
     multi_json (1.12.1)
     multi_xml (0.6.0)
     multipart-post (2.0.0)
-    puma (3.9.1)
+    nio4r (2.5.8)
+    puma (5.6.4)
+      nio4r (~> 2.0)
     rack (1.6.8)
     rb-readline (0.5.4)
     redis (3.3.3)