diff --git a/Gemfile.lock b/Gemfile.lock
index acd646f..71795b1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,9 @@ GEM
     layer-identity_token (0.1.0)
       jwt (~> 1.4, >= 1.4.1)
     multi_json (1.11.2)
-    puma (2.13.4)
+    nio4r (2.5.8)
+    puma (5.5.2)
+      nio4r (~> 2.0)
     rack (1.6.4)
     rack-protection (1.5.3)
       rack