diff --git a/Gemfile.lock b/Gemfile.lock
index 4d4ec7644..695d19895 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -195,6 +195,7 @@ GEM
     multi_json (1.13.1)
     multi_test (0.1.2)
     netrc (0.11.0)
+    nio4r (2.5.2)
     nokogiri (1.10.2)
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
@@ -205,7 +206,8 @@ GEM
       cliver (~> 0.3.1)
       websocket-driver (>= 0.2.0)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     pundit (2.0.1)
       activesupport (>= 3.0.0)
     pusher (0.17.0)