diff --git a/src/ui/Gemfile.lock b/src/ui/Gemfile.lock
index c42c4a1..a77ea64 100644
--- a/src/ui/Gemfile.lock
+++ b/src/ui/Gemfile.lock
@@ -18,9 +18,11 @@ GEM
     multi_json (1.13.1)
     multipart-post (2.0.0)
     mustermann (1.0.2)
+    nio4r (2.5.8)
     prometheus-client (0.7.1)
       quantile (~> 0.2.0)
-    puma (3.10.0)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     quantile (0.2.0)
     rack (2.0.5)
     rack-protection (2.0.2)