diff --git a/server/Gemfile.lock b/server/Gemfile.lock
index 0ea0bd3..7a2fbd8 100644
--- a/server/Gemfile.lock
+++ b/server/Gemfile.lock
@@ -106,7 +106,8 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.0.2)
-    puma (3.11.4)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
     rack-test (1.1.0)